Dual-front-end high-field laser system and method with fast switching timing control device

Abstract

The present invention discloses a dual-front-end high-field laser system and method with a fast-switching timing control device. The present invention uses two front-end amplification systems to provide a front-end backup for high-energy lasers. When one front-end amplification system fails, the other can be used, ensuring that the entire laser system can continue to operate. For laser pulses, if the pump is also a pulse, there are certain timing requirements between the amplified laser pulse and the pump pulse. This requires that the pump pulse, the amplified laser pulse, and other electronic devices in the laser optical path that need to be synchronized with the pulse all be synchronized in time. This requires that timing be provided to these devices via an external clock so that the laser can be amplified. The timing system is a very important system for this type of laser. The present invention uses timing control lasers to enable the high-energy amplification system to quickly switch between the two front-end amplification systems.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to a dual-front-end strong-field laser system with a fast-switching timing control device and a control method thereof. Background Art

[0002] With the development of technology, the intensity of strong field laser based on chirped laser pulse amplification (CPA) technology can reach 10 20 W / cm 2 When such high light intensity interacts with laser light, higher requirements are placed on the contrast of the laser light. To obtain a laser with higher contrast, dual CPA technology is currently a commonly used method to improve contrast.

[0003] The common CPA technology is as follows: an oscillator generates an ultrashort pulse (pulse width is usually in the order of picoseconds or femtoseconds) as a seed source, and the pulse is time-stretched by a stretcher to obtain a long pulse (pulse width is in the order of tens of picoseconds to nanoseconds, and the specific length of the pulse after stretching depends on the energy that needs to be amplified in the end). The amplifier system is used to amplify the energy of the stretched long pulse to obtain a high-energy pulse. The amplifier requires a high-energy pulse laser as the excitation source of the amplifier. The high-energy laser pulse is finally compressed to a minimum time scale (back to the pulse width of the seed source) by a compressor to obtain a high-peak power strong-field laser pulse.

[0004] The CPA system is as follows: Figure 1 As shown in the figure: The CPA system consists of two parts: a low-energy amplification system and a high-energy amplification system. The low-energy amplification system includes an oscillator, a stretcher, a first pump source and a first amplification system; the high-energy amplification system includes a second pump source, a second amplification system and a compressor. The low-energy amplification system usually generates laser pulses in the mJ range, which enter the high-energy amplification system and are further amplified to the joule or even hundreds of joules range.

[0005] The low-energy amplification system amplifies the nJ-level seed pulse to the mJ level. This type of laser has a large gain and a small laser spot size, so it is easy to have problems such as optical path misalignment, which may lead to laser system failure.

[0006] In the entire CPA system, the seed source will be broadened to the order of hundreds of ps to nanoseconds, and the pump pulse width is also in the order of nanoseconds. The amplification process is that the pump source excites the gain medium in the amplifier to an excited state, and then the seed source is stimulated and amplified after passing through the gain medium. The lifetime of the gain medium in the excited state is in the order of μs. If the seed source does not pass through the gain medium when the gain medium is in an excited state, the laser will not be amplified. Therefore, it is necessary to synchronize the amplified laser pulse with the pump pulse time. The currently used methods are as follows: Figure 2 As shown:

[0007] The seed source light output by the oscillator is fed into a photodetector, producing a seed source pulsed electronic signal with a repetition frequency of MHz to 100 MHz. This electronic signal is then fed into a clock controller to generate the synchronous clock signal required for the entire laser system. This MHz to 100 MHz electronic signal is then divided to obtain the required kHz or Hz output signal. This divided kHz or Hz output signal serves as the clock signal, strictly synchronized with the MHz to 100 MHz input signal. Furthermore, the clock controller includes a delay module that provides a delay ΔT of less than 1 ms to the divided kHz or Hz output signal, with a delay accuracy of 150 ps. Commercially available clock controllers with this delay module are typically the Standford DG645 or the Thlase ISEO.

[0008] The clock controller sends the divided clock signal to the first selector. After passing through the first stretcher, pulses with the same frequency as the clock signal are selected from the oscillator's seed source and fed into the first amplifier. The clock controller then sends the same frequency signal to the first pump source, controlling the timing of the pump pulses output by the first pump source with the clock controller's signal. This allows the pump pulses from the first pump source to precede the laser pulses amplified by the first amplifier, thereby achieving laser pulse amplification. The pulses from the first amplifier then enter the second amplifier group. The clock controller then sends the divided clock signal to the second pump source, controlling the timing of the pump pulses output by the pump source with the clock controller's signal. This allows the pump pulses from the second pump source to precede the laser pulses amplified by the second amplifier group, thereby achieving laser pulse amplification. The amplified laser pulses then enter the compressor, where the pulse width is compressed to produce ultrashort, ultraintense laser light. This type of CPA system is already available in mature products, such as the 100-TW lasers from Thales and Amplitude.

[0009] At present, the low-energy front end of this CPA system is the most vulnerable link in the entire laser system and is the key to affecting the stable operation of the entire laser system. Summary of the Invention

[0010] In view of the instability of the front end of large laser systems in the above prior art, the present invention proposes a dual-front-end strong field laser system with a fast switching timing control device and a control method thereof, which can achieve fast switching timing control.

[0011] An object of the present invention is to provide a dual-front-end high-field laser system with a fast switching timing control device.

[0012] The dual-front-end strong-field laser system with a fast-switching timing control device of the present invention is implemented in three ways: a signal selector, a high-energy detector, or a clock reference module.

[0013] The dual-front-end high-field laser system with a fast switching timing control device of the present invention adopts a signal selector and includes: a first front-end amplification system, a second front-end amplification system, a beam combining device and a high-energy amplification system;

[0014] The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, a first front-end detector, and a first front-end timing system. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector and then amplified by the first front-end amplifier. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0015] The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz, and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of KHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal with the same repetition frequency as the seed source pulse electronic signal output by the first front-end detector to the high-energy amplification system;

[0016] The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, a second front-end detector, and a second front-end timing system. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser.

[0017] The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between hundreds of kHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the second front-end timing system to the second selector is the same as that of the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system;

[0018] The lasers outputted by the first front-end amplifier and the second front-end amplifier pass through the beam combining device and enter the high-energy amplification system;

[0019] The high-energy amplification system includes a second amplifier group, a high-energy pump source, a compressor, a signal selector and a high-energy timing system; the laser output by the beam combiner enters the second amplifier group for amplification and then enters the compressor for compression, and the high-energy pump source provides an excitation source for the second amplifier group; the first front-end reference clock signal output by the first front-end timing system and the second front-end reference clock signal output by the second front-end timing system are input into the high-energy timing system after passing through the signal selector; the signal selector selects the required first front-end reference clock signal or the second front-end reference clock signal to enter the high-energy timing system; the high-energy timing system divides the first front-end reference clock signal or the second front-end reference clock signal of MHz-hundreds of MHz to obtain the required low-repetition-frequency clock signal, and the repetition frequency of the low-repetition-frequency clock signal obtained by the high-energy timing system is between hundreds of kHz and 0.1 Hz; at this time, the low-repetition-frequency clock signal obtained by the high-energy timing system is strictly synchronized with the first front-end or second front-end reference clock signal of MHz-hundreds of MHz; the high-energy timing system outputs the low-repetition-frequency clock signal to the high-energy pump source;

[0020] The first front-end timing system, the second front-end timing system and the high-energy timing system all have a delay function, providing delay for the divided low repetition frequency clock signal;

[0021] The high-energy timing system also has the function of storing and reading the delayed output signal; the storage and reading function means storing the delay and repetition frequency of the output signal, and reading it when needed for the next use, and outputting the clock signal of the stored delay and repetition frequency after reading;

[0022] Since the first front-end amplification system and the second front-end amplification system are different lasers, there are different situations in which the timing of the first front-end amplification system and the second front-end amplification system entering the high-energy amplification system. During the initial debugging, the timing of the high-energy timing system outputting to the high-energy pump source is adjusted for the lasers output by the first front-end amplification system and the second front-end amplification system, so that the high-energy amplification system obtains the optimal output, the clock signal read and output by the high-energy timing system to the high-energy pump source is optimized, and the relevant files are stored; wherein, when the first front-end amplification system inputs into the high-energy amplification system, the clock signal storage file read and output by the high-energy timing system is the first front-end clock system file, and when the second front-end amplification system inputs into the high-energy amplification system, the clock signal storage file read and output by the high-energy timing system is the second front-end clock system file;

[0023] The first front-end amplification system and the second front-end amplification system do not operate at the same time. The required first front-end reference clock signal or second front-end reference clock signal is quickly switched through the signal selector to enter the high-energy timing system, thereby realizing the rapid switching of the first front-end amplification system or the second front-end amplification system to operate and connect to the high-energy amplification system; when the first front-end amplification system is operating, the signal selector is set to select the first front-end reference clock signal, and the high-energy timing system reads and outputs the first front-end clock system file. At this time, the laser system operates in the input state of the first front-end amplification system; when the second front-end amplification system is operating, the signal selector is set to select the second front-end reference clock signal, and the high-energy timing system reads and outputs the second front-end clock system file. At this time, the laser system operates in the input state of the second front-end amplification system.

[0024] The signal selector uses a two-to-one multi-way switch with three terminals, connecting the MHz-to-hundred-MHz signal line output by the first front-end timing system, the MHz-to-hundred-MHz signal line output by the second front-end timing system, and the MHz-to-hundred-MHz signal line required by the high-energy timing system. When the first front-end amplification system is operating, the two-to-one switch connects the high-energy timing system and the first front-end timing system; when the second front-end amplification system is operating, the two-to-one switch connects the high-energy timing system and the second front-end timing system. The beam combiner uses a beam splitter.

[0025] The first front-end timing system, the second front-end timing system and the high-energy timing system all provide a delay of less than 1ms for the divided low repetition frequency clock signal, and the delay accuracy is 150ps.

[0026] The dual-front-end high-field laser system with a fast switching timing control device of the present invention adopts a high-energy detector and includes: a first front-end amplification system, a second front-end amplification system, a beam combining device and a high-energy amplification system;

[0027] The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, a first front-end detector, and a first front-end timing system. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector and then amplified by the first front-end amplifier. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0028] The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of kHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the first front-end detector, to the high-energy amplification system;

[0029] The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, a second front-end detector, and a second front-end timing system. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser.

[0030] The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between hundreds of kHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the second front-end timing system to the second selector is the same as that of the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system;

[0031] The lasers outputted by the first front-end amplifier and the second front-end amplifier pass through the beam combining device and enter the high-energy amplification system;

[0032] The high-energy amplification system includes a second amplifier group, a high-energy pump source, a compressor, a high-energy detector, and a high-energy timing system. The laser light output by the beam combiner enters the high-energy amplification system. A portion of the light enters the high-energy detector to obtain a detector signal. The remaining portion of the laser light enters the second amplifier group for amplification and then enters the compressor for compression. The high-energy pump source provides an excitation source for the second amplifier group. The detector signal output by the high-energy detector enters the high-energy timing system. The high-energy timing system provides a delay for the detector signal. The high-energy timing system outputs a clock signal to the high-energy pump source.

[0033] The first front-end amplification system and the second front-end amplification system do not operate simultaneously, so that the first front-end amplification system or the second front-end amplification system can be quickly connected to the high-energy amplification system. When the first front-end amplification system or the second front-end amplification system is operating, and the first front-end amplifier or the second front-end amplifier is input to the high-energy amplification system, for the high-energy amplification system, the delay of the clock signal of the high-energy pump source depends on the pulse time entering the second amplifier group. Since the starting point of the clock entering the high-energy timing system is the pulse time entering the second amplifier group, the delay of the high-energy pump source is determined and is independent of whether the first front-end amplification system or the second front-end amplification system is operating.

[0034] The high-energy detector uses a photodiode to detect the laser pulse signal, and the beam combining device uses a beam splitter.

[0035] The high-energy timing system provides a delay of less than 1ms for the detector signal, with a delay accuracy of 150ps.

[0036] The dual-front-end high-field laser system with a fast switching timing control device of the present invention adopts a clock reference module, and includes: a first front-end amplification system, a second front-end amplification system, a clock reference module, a beam combining device and a high-energy amplification system;

[0037] The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, and a first front-end detector. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector before entering the first front-end amplifier for amplification. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0038] The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, and a second front-end detector. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a laser beam in the millijoule range.

[0039] The lasers outputted by the first front-end amplifier and the second front-end amplifier pass through the beam combining device and enter the high-energy amplification system;

[0040] The high-energy amplification system includes a second amplifier group, a high-energy pump source, and a compressor. The laser output from the beam combiner enters the high-energy amplification system, enters the second amplifier group for amplification, and then enters the compressor for compression. The high-energy pump source provides an excitation source for the second amplifier group.

[0041] The clock reference module includes: a reference source, a first cavity length locker, a first front-end detector, a second cavity length locker, a second front-end detector and a timing system;

[0042] The reference source sends a reference signal;

[0043] Part of the laser light output by the first oscillator is received by a first front-end detector, which inputs the repetition frequency signal of the first oscillator into a first cavity length locker. The first cavity length locker receives a reference signal from a reference source and locks the repetition frequency signal of the first oscillator output by the first front-end detector to the reference source. The repetition frequency of the first oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the first cavity length locker differs from the repetition frequency of the first oscillator by ±1000 Hz. The first oscillator has a laser cavity, and an end mirror of the laser cavity is placed on a first piezoelectric ceramic. The output signal of the first cavity length locker controls the first piezoelectric ceramic, thereby controlling the cavity length of the laser cavity of the first oscillator, so that the repetition frequency of the first oscillator is the same as the reference signal output by the reference source.

[0044] Part of the laser light output by the second oscillator is received by a second front-end detector, which inputs the repetition frequency signal of the second oscillator into a second cavity length locker. The second cavity length locker receives a reference signal from a reference source and locks the repetition frequency signal of the second oscillator output by the second front-end detector to the reference source. The repetition frequency of the second oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the second cavity length locker differs from the repetition frequency of the second oscillator by ±1000 Hz. The second oscillator has a laser cavity, and an end mirror of the laser cavity is placed on a second piezoelectric ceramic. The output signal of the second cavity length locker controls the second piezoelectric ceramic, thereby controlling the cavity length of the laser cavity of the second oscillator, so that the repetition frequency of the second oscillator is the same as the reference signal output by the reference source.

[0045] The reference source outputs a MHz-hundreds of MHz reference signal to the timing system. The timing system divides the MHz-hundreds of MHz reference signal from the reference source to obtain the required low-repetition-rate clock signal. The repetition frequency of the low-repetition-rate clock signal obtained by the timing system is between hundreds of kHz and 0.1 Hz. At this time, the low-repetition-rate clock signal obtained by the timing system is strictly synchronized with the MHz-hundreds of MHz reference signal from the reference source. Since the repetition frequencies of the first oscillator and the second oscillator are both locked to the frequency of the reference signal output by the reference source, the laser pulses of the first oscillator and the second oscillator are strictly synchronized.

[0046] The timing system outputs a low-repetition-rate clock signal to the first selector, the first front-end pump source, the second selector, the second front-end pump source, and the high-energy pump source. The repetition frequency of the low-repetition-rate clock signal output by the timing system to the first selector and the first front-end pump source is the same; the repetition frequency of the low-repetition-rate clock signal output by the timing system to the second selector and the second front-end pump source is the same.

[0047] The laser pulses of the first oscillator and the second oscillator are strictly synchronized, and are synchronized with the reference source. The low repetition frequency clock signal output by the timing system based on the reference source is also strictly synchronized with the reference source. Therefore, there is no time jitter problem in controlling all the components of the entire laser system. When the first front-end amplification system and the second front-end amplification system are not operated at the same time, since the outputs of the first front-end amplification system and the second front-end amplification system are strictly synchronized, for the high-energy amplification system, the lasers output by the first front-end amplification system and the second front-end amplification system are the same in time. At this time, there is no need to switch, and the entire laser system can operate directly, thereby enabling the first front-end amplification system or the second front-end amplification system to be quickly connected to the high-energy amplification system.

[0048] The reference source is a signal generator that provides a signal with a repetition frequency equivalent to that of the first oscillator and the second oscillator. The beam combining device is a beam splitter.

[0049] Another object of the present invention is to provide a control method for a dual-front-end high-field laser system with a fast switching timing control device.

[0050] The control method of the dual-front-end high-field laser system with a fast switching timing control device of the present invention adopts a signal selector and includes the following steps:

[0051] 1) A first oscillator generates a laser pulse, a portion of which is received by a first front-end detector, and another portion is stretched by a first stretcher. The stretched laser pulse is then stretched by a first selector and amplified by a first front-end amplifier. A first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0052] 2) The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal with the same repetition frequency as the seed source pulse electronic signal output by the first front-end detector to the high-energy amplification system;

[0053] 3) A second oscillator generates laser pulses, a portion of which is received by a second front-end detector, and another portion is stretched by a second stretcher. The stretched laser pulses are then stretched by a second selector and amplified by a second front-end amplifier. A second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser.

[0054] 4) The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between 100 kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz; the low repetition frequency clock signal output by the second front-end timing system to the second selector has the same repetition frequency as the seed source pulse electronic signal output by the second front-end timing system and the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system;

[0055] 5) The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam combining device and enters the high-energy amplification system;

[0056] 6) The laser output by the beam combiner enters the second amplifier group for amplification and then enters the compressor for compression. The high-energy pump source provides an excitation source for the second amplifier group. The first front-end reference clock signal output by the first front-end timing system and the second front-end reference clock signal output by the second front-end timing system are input into the high-energy timing system after passing through a signal selector. The signal selector selects the required first front-end reference clock signal or second front-end reference clock signal to enter the high-energy timing system. The high-energy timing system divides the first front-end reference clock signal or the second front-end reference clock signal of MHz-hundreds of MHz to obtain the required low-repetition-frequency clock signal. The repetition frequency of the low-repetition-frequency clock signal obtained by the high-energy timing system is between hundreds of kHz and 0.1 Hz. At this time, the low-repetition-frequency clock signal obtained by the high-energy timing system is strictly synchronized with the first front-end or second front-end reference clock signal of MHz-hundreds of MHz. The high-energy timing system outputs the low-repetition-frequency clock signal to the high-energy pump source.

[0057] 7) The first front-end timing system, the second front-end timing system and the high-energy timing system provide delay for the divided low repetition frequency clock signal;

[0058] 8) The delay and repetition frequency provided by the high-energy timing system are stored and read out when needed for the next use, and the stored delay and repetition frequency clock signal is output after reading;

[0059] 9) If the first front-end amplification system and the second front-end amplification system are different lasers, and the timing of the first front-end amplification system and the second front-end amplification system entering the high-energy amplification system is different, during initial debugging, the timing of the high-energy timing system outputting the laser to the high-energy pump source is adjusted for the lasers output by the first front-end amplification system and the second front-end amplification system, so that the high-energy amplification system obtains optimal output, the clock signal read and output by the high-energy timing system to the high-energy pump source is optimized, and relevant files are stored; wherein, when the first front-end amplification system inputs into the high-energy amplification system, the clock signal storage file read and output by the high-energy timing system is the first front-end clock system file, and when the second front-end amplification system inputs into the high-energy amplification system, the clock signal storage file read and output by the high-energy timing system is the second front-end clock system file;

[0060] 10) The first front-end amplification system and the second front-end amplification system do not operate at the same time. The required first front-end reference clock signal or second front-end reference clock signal is quickly switched through the signal selector to enter the high-energy timing system, thereby realizing rapid switching of the first front-end amplification system or the second front-end amplification system to operate and connect to the high-energy amplification system; when the first front-end amplification system is operating, the signal selector is set to select the first front-end reference clock signal, and the high-energy timing system reads and outputs the first front-end clock system file. At this time, the laser system operates in the input state of the first front-end amplification system; when the second front-end amplification system is operating, the signal selector is set to select the second front-end reference clock signal, and the high-energy timing system reads and outputs the second front-end clock system file. At this time, the laser system operates in the input state of the second front-end amplification system.

[0061] The control method of the dual-front-end high-field laser system with a fast switching timing control device of the present invention adopts a high-energy detector and includes the following steps:

[0062] 1) A first oscillator generates a laser pulse, a portion of which is received by a first front-end detector, and another portion is stretched by a first stretcher. The stretched laser pulse is then stretched by a first selector and amplified by a first front-end amplifier. A first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0063] 2) The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal identical to the seed source pulse electronic signal output by the first front-end detector to the high-energy amplification system;

[0064] 3) A second oscillator generates laser pulses, a portion of which is received by a second front-end detector, and another portion is stretched by a second stretcher. The stretched laser pulses are then stretched by a second selector and amplified by a second front-end amplifier. A second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser.

[0065] 4) The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between 100 kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz; the low repetition frequency clock signal output by the second front-end timing system to the second selector has the same repetition frequency as the seed source pulse electronic signal output by the second front-end timing system and the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system;

[0066] 5) The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam combining device and enters the high-energy amplification system;

[0067] 6) The laser light output by the beam combiner enters the high-energy amplification system. Part of the light enters the high-energy detector to obtain the detector signal. The other part of the laser light enters the second amplifier group for amplification and then enters the compressor for compression. The high-energy pump source provides the excitation source for the second amplifier group. The detector signal output by the high-energy detector enters the high-energy timing system. The high-energy timing system provides a delay for the detector signal. The high-energy timing system outputs a clock signal to the high-energy pump source.

[0068] 7) The first front-end amplification system and the second front-end amplification system do not operate simultaneously, so that the first front-end amplification system or the second front-end amplification system can be quickly connected to the high-energy amplification system; when the first front-end amplification system or the second front-end amplification system is operating, and the first front-end amplifier or the second front-end amplifier is input to the high-energy amplification system, for the high-energy amplification system, the delay of the clock signal of the high-energy pump source depends on the pulse time entering the second amplifier group. Since the starting point of the clock entering the high-energy timing system is the pulse time entering the second amplifier group, the delay of the high-energy pump source is fixed and has nothing to do with whether the first front-end amplification system or the second front-end amplification system is operating.

[0069] The control method of the dual-front-end high-field laser system with a fast switching timing control device of the present invention adopts a clock reference module, comprising the following steps:

[0070] 1) A first oscillator generates a laser pulse, a portion of which is received by a first front-end detector, and another portion is stretched by a first stretcher. The stretched laser pulse is then stretched by a first selector and amplified by a first front-end amplifier. A first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0071] 2) A second oscillator generates laser pulses, a portion of which is received by a second front-end detector, and another portion is stretched by a second stretcher. The stretched laser pulses are then stretched by a second selector and amplified by a second front-end amplifier. A second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a laser beam in the millijoule range.

[0072] 3) The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam combining device and enters the high-energy amplification system;

[0073] 4) The laser output from the beam combiner enters the high-energy amplification system, enters the second amplifier group for amplification, and then enters the compressor for compression. The high-energy pump source provides the excitation source for the second amplifier group.

[0074] 5) The reference source sends a reference signal;

[0075] 6) A portion of the laser light output by the first oscillator is received by a first front-end detector, which inputs the first oscillator repetition frequency signal into a first cavity length locker. The first cavity length locker receives a reference signal from a reference source and locks the first oscillator repetition frequency signal output by the first front-end detector to the reference source. The repetition frequency of the first oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the first cavity length locker differs from the repetition frequency of the first oscillator by ±1000 Hz. The first oscillator has a laser cavity, an end mirror of the laser cavity is placed on a first piezoelectric ceramic, and the output signal of the first cavity length locker controls the first piezoelectric ceramic, thereby controlling the cavity length of the laser cavity of the first oscillator, thereby achieving the same repetition frequency of the first oscillator as the reference signal output by the reference source.

[0076] 7) A portion of the laser light output by the second oscillator is received by a second front-end detector, which inputs the second oscillator repetition frequency signal into a second cavity length locker. The second cavity length locker receives a reference signal from a reference source and locks the second oscillator repetition frequency signal output by the second front-end detector to the reference source. The repetition frequency of the second oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the second cavity length locker differs from the repetition frequency of the second oscillator by ±1000 Hz. The second oscillator has a laser cavity, an end mirror of the laser cavity is placed on a second piezoelectric ceramic, and the output signal of the second cavity length locker controls the second piezoelectric ceramic, thereby controlling the cavity length of the laser cavity of the second oscillator, thereby achieving the same repetition frequency of the second oscillator as the reference signal output by the reference source.

[0077] 8) The reference source outputs a MHz-hundreds of MHz reference signal to the timing system. The timing system divides the MHz-hundreds of MHz reference signal from the reference source to obtain the required low-repetition-rate clock signal. The repetition rate of the low-repetition-rate clock signal obtained by the timing system is between 100 kHz and 0.1 Hz. At this time, the low-repetition-rate clock signal obtained by the timing system is strictly synchronized with the MHz-hundreds of MHz reference signal from the reference source. Since the repetition rates of the first oscillator and the second oscillator are both locked to the frequency of the reference signal output by the reference source, the laser pulses of the first oscillator and the second oscillator are strictly synchronized.

[0078] 9) The timing system outputs a low repetition frequency clock signal to the first selector, the first front-end pump source, the second selector, the second front-end pump source, and the high-energy pump source; wherein the repetition frequency of the low repetition frequency clock signal output by the timing system to the first selector and the first front-end pump source is the same; the repetition frequency of the low repetition frequency clock signal output by the timing system to the second selector and the second front-end pump source is the same.

[0079] The repetition frequency of the repetition frequency of the clock signal is the same;

[0080] 10) The laser pulses of the first oscillator and the second oscillator are strictly synchronized, and are synchronized with the reference source. The low repetition frequency clock signal output by the timing system based on the reference source is also strictly synchronized with the reference source. Therefore, there is no time jitter problem in controlling all the components of the entire laser system. When the first front-end amplification system and the second front-end amplification system are not running at the same time, since the outputs of the first front-end amplification system and the second front-end amplification system are strictly synchronized, for the high-energy amplification system, the lasers output by the first front-end amplification system and the second front-end amplification system are the same in time. At this time, there is no need to switch, and the entire laser system can operate directly, thereby enabling the first front-end amplification system or the second front-end amplification system to be quickly connected to the high-energy amplification system.

[0081] Advantages of the present invention:

[0082] The present invention adopts two front-end amplification systems to provide a front-end backup for high-energy lasers. When one front-end amplification system fails, the other front-end amplification system can be used, thus ensuring that the entire laser system can continue to be used. For laser pulses, when the pump is also a pulse, there are certain timing requirements between the amplified laser pulse and the pump pulse. This requires that the pump pulse, the amplified laser pulse and other electronic devices on the laser optical path that need to be synchronized with the pulse need to be synchronized in time. This requires that the timing be provided to these devices through an external clock so that the laser can be amplified. The timing system is a very important system for this type of laser. The present invention adopts timing control laser to enable the high-energy amplification system to quickly switch between the two front-end amplification systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 This is a structural diagram of the existing CPA system;

[0084] Figure 2 It is the structural block diagram of the existing CPA timing system;

[0085] Figure 3 Schematic diagram of embodiment 1 of a dual-front-end high-field laser system with a fast switching timing control device of the present invention;

[0086] Figure 4 Schematic diagram of embodiment 2 of a dual-front-end high-field laser system with a fast switching timing control device of the present invention;

[0087] Figure 5 Schematic diagram of embodiment 3 of the dual-front-end high-field laser system with a fast switching timing control device of the present invention. DETAILED DESCRIPTION

[0088] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0089] Example 1

[0090] like Figure 3 As shown, the dual-front-end high-field laser system with a fast switching timing control device of this embodiment includes: a first front-end amplification system, a second front-end amplification system, a beam combining device and a high-energy amplification system;

[0091] The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, a first front-end detector, and a first front-end timing system. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector and then amplified by the first front-end amplifier. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0092] The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal is between hundreds of kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal with the same repetition frequency as the seed source pulse electronic signal output by the first front-end detector to the high-energy amplification system;

[0093] The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, a second front-end detector, and a second front-end timing system. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser.

[0094] The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal is between hundreds of kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the low repetition frequency clock signal output by the second front-end timing system to the second selector has the same repetition frequency as the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system;

[0095] The beam combining device uses a beam splitter. The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam splitter and then enters the high-energy amplification system.

[0096] The high-energy amplification system includes a second amplifier group, a high-energy pump source, a compressor, a signal selector and a high-energy timing system; the laser output by the beam combiner enters the second amplifier group for amplification and then enters the compressor for compression, and the high-energy pump source provides an excitation source for the second amplifier group; the first front-end reference clock signal output by the first front-end timing system and the second front-end reference clock signal output by the second front-end timing system are input into the high-energy timing system after passing through the signal selector; the signal selector selects the required first front-end reference clock signal or second front-end reference clock signal to enter the high-energy timing system; the high-energy timing system divides the first front-end reference clock signal or the second front-end reference clock signal of MHz-hundreds of MHz to obtain the required low-repetition-frequency clock signal, and the repetition frequency of the low-repetition-frequency clock signal is between hundreds of kHz and 0.1 Hz; the low-repetition-frequency clock signal obtained by the frequency division is strictly synchronized with the first front-end or second front-end reference clock signal of MHz-hundreds of MHz; the high-energy timing system outputs the low-repetition-frequency clock signal to the high-energy pump source;

[0097] The first front-end timing system, the second front-end timing system and the high-energy timing system all have a delay function, providing a delay of less than 1ms for the divided low-repetition-rate clock signal, with a delay accuracy of 150ps.

[0098] The high-energy timing system also has the function of storing and reading the delayed output; the storage and reading function means that the delay and repetition frequency provided by the output signal can be stored and read the next time it is used as needed, and the clock signal of the stored delay and repetition frequency is output after reading;

[0099] If the first front-end amplification system and the second front-end amplification system are different lasers, there are different situations in which the timing of the first front-end amplification system and the second front-end amplification system entering the high-energy amplification system. During initial debugging, for the lasers output by the first front-end amplification system and the second front-end amplification system, the timing of the high-energy timing system outputting the high-energy pump source is adjusted so that the high-energy amplification system obtains the optimal output. The clock signal output by the high-energy timing system to the high-energy pump source is optimized, and the relevant files are stored. When the first front-end amplification system inputs the high-energy amplification system, the storage file of the clock signal output by the high-energy timing system is the first front-end clock system file, and when the second front-end amplification system inputs the high-energy amplification system, the storage file of the clock signal output by the high-energy timing system is the second front-end clock system file.

[0100] The first front-end amplification system and the second front-end amplification system do not operate at the same time. The required first front-end reference clock signal or second front-end reference clock signal is quickly switched through the signal selector to enter the high-energy timing system, thereby realizing rapid switching of the first front-end amplification system or the second front-end amplification system to the high-energy amplification system; when the first front-end amplification system is operating, the signal selector is set to select the first front-end reference clock signal, and the high-energy timing system reads the first front-end clock system file. At this time, the laser system operates in the first front-end amplification system input state; when the second front-end amplification system is operating, the signal selector is set to select the second front-end reference clock signal, and the high-energy timing system reads the second front-end clock system file. At this time, the laser system operates in the second front-end amplification system input state.

[0101] Example 2

[0102] like Figure 4 As shown, the dual-front-end high-field laser system with a fast switching timing control device of this embodiment includes: a first front-end amplification system, a second front-end amplification system, a beam combining device and a high-energy amplification system;

[0103] The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, a first front-end detector, and a first front-end timing system. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector and then amplified by the first front-end amplifier. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0104] The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of kHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the first front-end detector, to the high-energy amplification system;

[0105] The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, a second front-end detector, and a second front-end timing system. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser.

[0106] The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between hundreds of kHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the second front-end timing system to the second selector is the same as that of the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system;

[0107] The beam combining device uses a beam splitter. The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam splitter and then enters the high-energy amplification system.

[0108] The high-energy amplification system includes a second amplifier group, a high-energy pump source, a compressor, a high-energy detector, and a high-energy timing system. The laser light output by the beam combiner enters the high-energy amplification system. Part of the light enters the high-energy detector to obtain the detector signal. The remaining part of the laser light enters the second amplifier group for amplification and then enters the compressor for compression. The high-energy pump source provides an excitation source for the second amplifier group. The detector signal output by the high-energy detector enters the high-energy timing system. The high-energy timing system provides a delay of less than 1ms for the detector signal, with a delay accuracy of 150ps. The high-energy timing system outputs a low-repetition-rate clock signal to the high-energy pump source.

[0109] The first front-end amplification system and the second front-end amplification system do not operate at the same time. Since the high-energy detector obtains the pulse signal entering the high-energy amplification system, it provides a timing basis for the high-energy timing system of the high-energy amplification system. The high-energy timing system does not need to obtain the timing basis from the first front-end timing system or the second front-end timing system. When the first front-end amplification system or the second front-end amplification system is operating separately, there is no need to perform timing switching, and the entire laser system operates directly, so it is possible to quickly switch the first front-end amplification system or the second front-end amplification system to connect to the high-energy amplification system. When the first front-end amplification system is operating or the second front-end amplification system is operating, when the first front-end amplifier or the second front-end amplifier is input to the high-energy amplification system, for the high-energy amplification system, the delay of the clock signal of the high-energy pump source depends on the pulse time entering the second amplifier group. Since the starting point of the clock entering the high-energy timing system is the pulse time entering the second amplifier group, the delay of the output high-energy pump source is certain, regardless of whether the first front-end amplification system or the second front-end amplification system is operating.

[0110] Example 3

[0111] like Figure 5 As shown, the dual-front-end high-field laser system with a fast switching timing control device of this embodiment includes: a first front-end amplification system, a second front-end amplification system, a clock reference module, a beam combining device and a high-energy amplification system;

[0112] The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, and a first front-end detector. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector before entering the first front-end amplifier for amplification. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range.

[0113] The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, and a second front-end detector. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a laser beam in the millijoule range.

[0114] The beam combining device uses a beam splitter. The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam splitter and then enters the high-energy amplification system.

[0115] The high-energy amplification system includes a second amplifier group, a high-energy pump source, and a compressor. The laser output from the beam combiner enters the high-energy amplification system, enters the second amplifier group for amplification, and then enters the compressor for compression. The high-energy pump source provides an excitation source for the second amplifier group.

[0116] The clock reference module includes: a reference source, a first cavity length locker, a first front-end detector, a second cavity length locker, a second front-end detector and a timing system;

[0117] Part of the laser light output by the first oscillator is received by a first front-end detector, which inputs the repetition frequency signal of the first oscillator into a first cavity length locker. The first cavity length locker receives a reference signal from a reference source and locks the repetition frequency signal of the first oscillator output by the first front-end detector to the reference source. The repetition frequency of the first oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the first cavity length locker differs from the repetition frequency of the first oscillator by ±1000 Hz. The first oscillator has a laser cavity, and an end mirror of the laser cavity is placed on a piezoelectric ceramic. The output signal of the first cavity length locker controls the piezoelectric ceramic in the first oscillator, thereby controlling the laser cavity length of the first oscillator, thereby achieving the repetition frequency of the first oscillator being the same as the reference signal output by the reference source.

[0118] Part of the laser light output by the second oscillator is received by a second front-end detector, which inputs the repetition frequency signal of the second oscillator into a second cavity length locker. The second cavity length locker receives a reference signal from a reference source and locks the repetition frequency signal of the second oscillator output by the second front-end detector to the reference source. The repetition frequency of the second oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the second cavity length locker differs from the repetition frequency of the second oscillator by ±1000 Hz. The second oscillator has a laser cavity, and an end mirror of the laser cavity is placed on a piezoelectric ceramic. The output signal of the second cavity length locker controls the piezoelectric ceramic in the second oscillator, thereby controlling the laser cavity length of the second oscillator, thereby achieving the repetition frequency of the second oscillator being the same as the reference signal output by the reference source.

[0119] The reference source outputs a MHz-100 MHz reference signal to the timing system. The timing system divides the MHz-100 MHz reference signal from the reference source to obtain the required low-repetition-rate clock signal, with a repetition rate between 100 kHz and 0.1 Hz. The low-repetition-rate clock signal obtained by the frequency division is strictly synchronized with the MHz-100 MHz reference signal from the reference source. Because the repetition rates of the first oscillator and the second oscillator are both locked to the reference source output frequency, the pulses of the first oscillator and the second oscillator are strictly synchronized.

[0120] The timing system outputs a low-repetition-rate clock signal to the first selector, the first front-end pump source, the second selector, the second front-end pump source, and the high-energy pump source. The repetition frequency of the low-repetition-rate clock signal output by the timing system to the first selector and the first front-end pump source is the same; the repetition frequency of the low-repetition-rate clock signal output by the timing system to the second selector and the second front-end pump source is the same.

[0121] Since the pulses of the first oscillator and the second oscillator are strictly synchronized and synchronized with the time of the reference source, the clock signal output by the timing system based on the reference source is also strictly synchronized with the reference source. Therefore, there is no time jitter problem in all the components controlling the entire laser system. When the first front-end amplification system and the second front-end amplification system are not running at the same time, since the outputs of the first front-end amplification system and the second front-end amplification system are strictly synchronized, for the high-energy amplification system, the lasers output by the first front-end amplification system and the second front-end amplification system are the same in time. At this time, there is no need to switch, and the entire laser system can operate directly, so it is possible to quickly switch the first front-end amplification system or the second front-end amplification system to connect to the high-energy amplification system.

[0122] Finally, it should be noted that the purpose of disclosing the embodiments is to facilitate a further understanding of the present invention. However, those skilled in the art will appreciate that various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the contents disclosed in the embodiments; the scope of protection claimed by the present invention shall be determined by the scope defined in the claims.

Claims

1. A dual-front-end high-field laser system with a fast switching timing control device, characterized in that: The dual-front-end high-field laser system includes: a first front-end amplification system, a second front-end amplification system, a beam combining device and a high-energy amplification system; The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, a first front-end detector, and a first front-end timing system. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector and then amplified by the first front-end amplifier. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range. The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz, and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of KHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal with the same repetition frequency as the seed source pulse electronic signal output by the first front-end detector to the high-energy amplification system; The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, a second front-end detector, and a second front-end timing system. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser. The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between hundreds of kHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the second front-end timing system to the second selector is the same as that of the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system; The lasers outputted by the first front-end amplifier and the second front-end amplifier pass through the beam combining device and enter the high-energy amplification system; The high-energy amplification system includes a second amplifier group, a high-energy pump source, a compressor, a signal selector and a high-energy timing system; the laser output by the beam combiner enters the second amplifier group for amplification and then enters the compressor for compression, and the high-energy pump source provides an excitation source for the second amplifier group; the first front-end reference clock signal output by the first front-end timing system and the second front-end reference clock signal output by the second front-end timing system are input into the high-energy timing system after passing through the signal selector; the signal selector selects the required first front-end reference clock signal or the second front-end reference clock signal to enter the high-energy timing system; the high-energy timing system divides the first front-end reference clock signal or the second front-end reference clock signal of MHz-hundreds of MHz to obtain the required low-repetition-frequency clock signal, and the repetition frequency of the low-repetition-frequency clock signal obtained by the high-energy timing system is between hundreds of kHz and 0.1 Hz; at this time, the low-repetition-frequency clock signal obtained by the high-energy timing system is strictly synchronized with the first front-end or second front-end reference clock signal of MHz-hundreds of MHz; the high-energy timing system outputs the low-repetition-frequency clock signal to the high-energy pump source; The first front-end timing system, the second front-end timing system and the high-energy timing system all have a delay function, providing delay for the divided low repetition frequency clock signal; The high-energy timing system also has the function of storing and reading the delayed output signal; the storage and reading function means storing the delay and repetition frequency of the output signal, and reading it when needed for the next use, and outputting the clock signal of the stored delay and repetition frequency after reading; Since the first front-end amplification system and the second front-end amplification system are different lasers, there are different situations in which the timing of the first front-end amplification system and the second front-end amplification system entering the high-energy amplification system. During the initial debugging, the timing of the high-energy timing system outputting to the high-energy pump source is adjusted for the lasers output by the first front-end amplification system and the second front-end amplification system, so that the high-energy amplification system obtains the optimal output, the clock signal read and output by the high-energy timing system to the high-energy pump source is optimized, and the relevant files are stored; wherein, when the first front-end amplification system inputs into the high-energy amplification system, the clock signal storage file read and output by the high-energy timing system is the first front-end clock system file, and when the second front-end amplification system inputs into the high-energy amplification system, the clock signal storage file read and output by the high-energy timing system is the second front-end clock system file; The first front-end amplification system and the second front-end amplification system do not operate at the same time. The required first front-end reference clock signal or second front-end reference clock signal is quickly switched through the signal selector to enter the high-energy timing system, thereby realizing the rapid switching of the first front-end amplification system or the second front-end amplification system to operate and connect to the high-energy amplification system; when the first front-end amplification system is operating, the signal selector is set to select the first front-end reference clock signal, and the high-energy timing system reads and outputs the first front-end clock system file. At this time, the laser system operates in the input state of the first front-end amplification system; when the second front-end amplification system is operating, the signal selector is set to select the second front-end reference clock signal, and the high-energy timing system reads and outputs the second front-end clock system file. At this time, the laser system operates in the input state of the second front-end amplification system.

2. The dual-front-end high-field laser system according to claim 1, characterized in that: The signal selector adopts a two-to-one multi-way switch, which has three terminals, respectively connected to the MHz-to-hundred-MHz signal line output by the first front-end timing system, the MHz-to-hundred-MHz signal line output by the second front-end timing system, and the MHz-to-hundred-MHz signal line required to be input by the high-energy timing system; when the first front-end amplification system is running, the two-to-one switch connects the high-energy timing system and the first front-end timing system; When the second front-end amplification system is running, the two-selection switch connects the high-energy timing system and the second front-end timing system.

3. A dual-front-end high-field laser system with a fast switching timing control device, characterized in that: The dual-front-end high-field laser system includes: a first front-end amplification system, a second front-end amplification system, a beam combining device and a high-energy amplification system; The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, a first front-end detector, and a first front-end timing system. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector and then amplified by the first front-end amplifier. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range. The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz, and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of KHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal with the same repetition frequency as the seed source pulse electronic signal output by the first front-end detector to the high-energy amplification system; The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, a second front-end detector, and a second front-end timing system. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser. The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between hundreds of kHz and 0.1Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the second front-end timing system to the second selector is the same as that of the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system; The lasers outputted by the first front-end amplifier and the second front-end amplifier pass through the beam combining device and enter the high-energy amplification system; The high-energy amplification system includes a second amplifier group, a high-energy pump source, a compressor, a high-energy detector, and a high-energy timing system. The laser light output by the beam combiner enters the high-energy amplification system. A portion of the light enters the high-energy detector to obtain a detector signal. The remaining portion of the laser light enters the second amplifier group for amplification and then enters the compressor for compression. The high-energy pump source provides an excitation source for the second amplifier group. The detector signal output by the high-energy detector enters the high-energy timing system. The high-energy timing system provides a delay for the detector signal. The high-energy timing system outputs a clock signal to the high-energy pump source. The first front-end amplification system and the second front-end amplification system do not operate simultaneously, so that the first front-end amplification system or the second front-end amplification system can be quickly connected to the high-energy amplification system. When the first front-end amplification system or the second front-end amplification system is operating, and the first front-end amplifier or the second front-end amplifier is input to the high-energy amplification system, for the high-energy amplification system, the delay of the clock signal of the high-energy pump source depends on the pulse time entering the second amplifier group. Since the starting point of the clock entering the high-energy timing system is the pulse time entering the second amplifier group, the delay of the high-energy pump source is determined and is independent of whether the first front-end amplification system or the second front-end amplification system is operating.

4. The dual-front-end high-field laser system according to claim 3, characterized in that: The high energy detector adopts a photodiode.

5. A dual-front-end high-field laser system with a fast switching timing control device, characterized in that: The dual-front-end high-field laser system includes: a first front-end amplification system, a second front-end amplification system, a clock reference module, a beam combining device and a high-energy amplification system; The first front-end amplification system includes a first oscillator, a first stretcher, a first selector, a first front-end pump source, a first front-end amplifier, and a first front-end detector. A portion of the laser pulse generated by the first oscillator is received by the first front-end detector, while another portion is stretched by the first stretcher. The stretched laser pulse is then selected by the first selector before entering the first front-end amplifier for amplification. The first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range. The second front-end amplification system includes a second oscillator, a second stretcher, a second selector, a second front-end pump source, a second front-end amplifier, and a second front-end detector. A portion of the laser pulse generated by the second oscillator is received by the second front-end detector, while another portion is stretched by the second stretcher. The stretched laser pulse is then selected by the second selector before entering the second front-end amplifier for amplification. The second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a laser beam in the millijoule range. The lasers outputted by the first front-end amplifier and the second front-end amplifier pass through the beam combining device and enter the high-energy amplification system; The high-energy amplification system includes a second amplifier group, a high-energy pump source, and a compressor. The laser output from the beam combiner enters the high-energy amplification system, enters the second amplifier group for amplification, and then enters the compressor for compression. The high-energy pump source provides an excitation source for the second amplifier group. The clock reference module includes: a reference source, a first cavity length locker, a first front-end detector, a second cavity length locker, a second front-end detector and a timing system; The reference source sends a reference signal; Part of the laser light output by the first oscillator is received by a first front-end detector, which inputs the repetition frequency signal of the first oscillator into a first cavity length locker. The first cavity length locker receives a reference signal from a reference source and locks the repetition frequency signal of the first oscillator output by the first front-end detector to the reference source. The repetition frequency of the first oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the first cavity length locker differs from the repetition frequency of the first oscillator by ±1000 Hz. The first oscillator has a laser cavity, and an end mirror of the laser cavity is placed on a first piezoelectric ceramic. The output signal of the first cavity length locker controls the first piezoelectric ceramic, thereby controlling the cavity length of the laser cavity of the first oscillator, so that the repetition frequency of the first oscillator is the same as the reference signal output by the reference source. Part of the laser light output by the second oscillator is received by a second front-end detector, which inputs the repetition frequency signal of the second oscillator into a second cavity length locker. The second cavity length locker receives a reference signal from a reference source and locks the repetition frequency signal of the second oscillator output by the second front-end detector to the reference source. The repetition frequency of the second oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the second cavity length locker differs from the repetition frequency of the second oscillator by ±1000 Hz. The second oscillator has a laser cavity, and an end mirror of the laser cavity is placed on a second piezoelectric ceramic. The output signal of the second cavity length locker controls the second piezoelectric ceramic, thereby controlling the cavity length of the laser cavity of the second oscillator, so that the repetition frequency of the second oscillator is the same as the reference signal output by the reference source. The reference source outputs a MHz-hundreds of MHz reference signal to the timing system. The timing system divides the MHz-hundreds of MHz reference signal from the reference source to obtain the required low-repetition-rate clock signal. The repetition frequency of the low-repetition-rate clock signal obtained by the timing system is between hundreds of kHz and 0.1 Hz. At this time, the low-repetition-rate clock signal obtained by the timing system is strictly synchronized with the MHz-hundreds of MHz reference signal from the reference source. Since the repetition frequencies of the first oscillator and the second oscillator are both locked to the frequency of the reference signal output by the reference source, the laser pulses of the first oscillator and the second oscillator are strictly synchronized. The timing system outputs a low-repetition-rate clock signal to the first selector, the first front-end pump source, the second selector, the second front-end pump source, and the high-energy pump source. The repetition frequency of the low-repetition-rate clock signal output by the timing system to the first selector and the first front-end pump source is the same; the repetition frequency of the low-repetition-rate clock signal output by the timing system to the second selector and the second front-end pump source is the same. The laser pulses of the first oscillator and the second oscillator are strictly synchronized, and are synchronized with the reference source. The low repetition frequency clock signal output by the timing system based on the reference source is also strictly synchronized with the reference source. Therefore, there is no time jitter problem in controlling all the components of the entire laser system. When the first front-end amplification system and the second front-end amplification system are not operated at the same time, since the outputs of the first front-end amplification system and the second front-end amplification system are strictly synchronized, for the high-energy amplification system, the lasers output by the first front-end amplification system and the second front-end amplification system are the same in time. At this time, there is no need to switch, and the entire laser system can operate directly, thereby enabling the first front-end amplification system or the second front-end amplification system to be quickly connected to the high-energy amplification system.

6. The dual-front-end high-field laser system according to claim 5, characterized in that: The reference source adopts a signal generator.

7. The dual-front-end high-field laser system according to any one of claims 1, 3 or 5, characterized in that: The beam combining device adopts a beam splitter.

8. A control method for a dual-front-end high-field laser system with a fast switching timing control device according to claim 1, characterized in that: The control method comprises the following steps: 1) A first oscillator generates a laser pulse, a portion of which is received by a first front-end detector, and another portion is stretched by a first stretcher. The stretched laser pulse is then stretched by a first selector and amplified by a first front-end amplifier. A first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range. 2) The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal with the same repetition frequency as the seed source pulse electronic signal output by the first front-end detector to the high-energy amplification system; 3) A second oscillator generates laser pulses, a portion of which is received by a second front-end detector, and another portion is stretched by a second stretcher. The stretched laser pulses are then stretched by a second selector and amplified by a second front-end amplifier. A second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser. 4) The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between 100 kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz; the low repetition frequency clock signal output by the second front-end timing system to the second selector has the same repetition frequency as the seed source pulse electronic signal output by the second front-end timing system and the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system; 5) The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam combining device and enters the high-energy amplification system; 6) The laser output by the beam combiner enters the second amplifier group for amplification and then enters the compressor for compression. The high-energy pump source provides an excitation source for the second amplifier group. The first front-end reference clock signal output by the first front-end timing system and the second front-end reference clock signal output by the second front-end timing system are input into the high-energy timing system after passing through a signal selector. The signal selector selects the required first front-end reference clock signal or second front-end reference clock signal to enter the high-energy timing system. The high-energy timing system divides the first front-end reference clock signal or the second front-end reference clock signal of MHz-hundreds of MHz to obtain the required low-repetition-frequency clock signal. The repetition frequency of the low-repetition-frequency clock signal obtained by the high-energy timing system is between hundreds of kHz and 0.1 Hz. At this time, the low-repetition-frequency clock signal obtained by the high-energy timing system is strictly synchronized with the first front-end or second front-end reference clock signal of MHz-hundreds of MHz. The high-energy timing system outputs the low-repetition-frequency clock signal to the high-energy pump source. 7) The first front-end timing system, the second front-end timing system and the high-energy timing system provide delay for the divided low repetition frequency clock signal; 8) The delay and repetition frequency provided by the high-energy timing system are stored and read out when needed for the next use, and the stored delay and repetition frequency clock signal is output after reading; 9) If the first front-end amplification system and the second front-end amplification system are different lasers, and the timing of the first front-end amplification system and the second front-end amplification system entering the high-energy amplification system is different, during initial debugging, the timing of the high-energy timing system outputting the laser to the high-energy pump source is adjusted for the lasers output by the first front-end amplification system and the second front-end amplification system, so that the high-energy amplification system obtains optimal output, the clock signal read and output by the high-energy timing system to the high-energy pump source is optimized, and relevant files are stored; wherein, when the first front-end amplification system inputs into the high-energy amplification system, the clock signal storage file read and output by the high-energy timing system is the first front-end clock system file, and when the second front-end amplification system inputs into the high-energy amplification system, the clock signal storage file read and output by the high-energy timing system is the second front-end clock system file; 10) The first front-end amplification system and the second front-end amplification system do not operate at the same time. The required first front-end reference clock signal or second front-end reference clock signal is quickly switched through the signal selector to enter the high-energy timing system, thereby realizing rapid switching of the first front-end amplification system or the second front-end amplification system to operate and connect to the high-energy amplification system; when the first front-end amplification system is operating, the signal selector is set to select the first front-end reference clock signal, and the high-energy timing system reads and outputs the first front-end clock system file. At this time, the laser system operates in the input state of the first front-end amplification system; when the second front-end amplification system is operating, the signal selector is set to select the second front-end reference clock signal, and the high-energy timing system reads and outputs the second front-end clock system file. At this time, the laser system operates in the input state of the second front-end amplification system.

9. A control method for a dual-front-end high-field laser system with a fast switching timing control device as claimed in claim 3, characterized in that: The control method comprises the following steps: 1) A first oscillator generates a laser pulse, a portion of which is received by a first front-end detector, and another portion is stretched by a first stretcher. The stretched laser pulse is then stretched by a first selector and amplified by a first front-end amplifier. A first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range. 2) The first front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz-hundreds of MHz and inputs it into the first front-end timing system; the first front-end timing system divides the seed source pulse electronic signal of MHz-hundreds of MHz output by the first front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is between hundreds of kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the first front-end timing system is strictly synchronized with the seed source pulse electronic signal of MHz-hundreds of MHz; the repetition frequency of the low repetition frequency clock signal output by the first front-end timing system to the first selector and the first front-end pump source is the same; at the same time, the first front-end timing system also outputs a first front-end reference clock signal identical to the seed source pulse electronic signal output by the first front-end detector to the high-energy amplification system; 3) A second oscillator generates laser pulses, a portion of which is received by a second front-end detector, and another portion is stretched by a second stretcher. The stretched laser pulses are then stretched by a second selector and amplified by a second front-end amplifier. A second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a mJ-level laser. 4) The second front-end detector obtains a seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz and inputs it into the second front-end timing system; the second front-end timing system divides the seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz output by the second front-end detector to obtain the required low repetition frequency clock signal, and the repetition frequency of the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is between 100 kHz and 0.1 Hz; at this time, the low repetition frequency clock signal obtained by the frequency division of the second front-end timing system is strictly synchronized with the seed source pulse electronic signal with a repetition frequency of MHz to 100 MHz; the low repetition frequency clock signal output by the second front-end timing system to the second selector has the same repetition frequency as the seed source pulse electronic signal output by the second front-end timing system and the second front-end pump source; at the same time, the second front-end timing system also outputs a second front-end reference clock signal, which is the same as the seed source pulse electronic signal output by the second front-end detector, to the high-energy amplification system; 5) The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam combining device and enters the high-energy amplification system; 6) The laser light output by the beam combiner enters the high-energy amplification system. Part of the light enters the high-energy detector to obtain the detector signal. The other part of the laser light enters the second amplifier group for amplification and then enters the compressor for compression. The high-energy pump source provides the excitation source for the second amplifier group. The detector signal output by the high-energy detector enters the high-energy timing system. The high-energy timing system provides a delay for the detector signal. The high-energy timing system outputs a clock signal to the high-energy pump source. 7) The first front-end amplification system and the second front-end amplification system do not operate simultaneously, so that the first front-end amplification system or the second front-end amplification system can be quickly connected to the high-energy amplification system; when the first front-end amplification system or the second front-end amplification system is operating, and the first front-end amplifier or the second front-end amplifier is input to the high-energy amplification system, for the high-energy amplification system, the delay of the clock signal of the high-energy pump source depends on the pulse time entering the second amplifier group. Since the starting point of the clock entering the high-energy timing system is the pulse time entering the second amplifier group, the delay of the high-energy pump source is fixed and has nothing to do with whether the first front-end amplification system or the second front-end amplification system is operating.

10. A control method for a dual-front-end high-field laser system with a fast switching timing control device according to claim 5, characterized in that: The control method comprises the following steps: 1) A first oscillator generates a laser pulse, a portion of which is received by a first front-end detector, and another portion is stretched by a first stretcher. The stretched laser pulse is then stretched by a first selector and amplified by a first front-end amplifier. A first front-end pump source provides an excitation source for the first front-end amplifier, which then outputs a laser beam in the millijoule range. 2) A second oscillator generates laser pulses, a portion of which is received by a second front-end detector, and another portion is stretched by a second stretcher. The stretched laser pulses are then stretched by a second selector and amplified by a second front-end amplifier. A second front-end pump source provides an excitation source for the second front-end amplifier, which then outputs a laser beam in the millijoule range. 3) The laser output from the first front-end amplifier and the second front-end amplifier passes through the beam combining device and enters the high-energy amplification system; 4) The laser output from the beam combiner enters the high-energy amplification system, enters the second amplifier group for amplification, and then enters the compressor for compression. The high-energy pump source provides the excitation source for the second amplifier group. 5) The reference source sends a reference signal; 6) A portion of the laser light output by the first oscillator is received by a first front-end detector, which inputs the first oscillator repetition frequency signal into a first cavity length locker. The first cavity length locker receives a reference signal from a reference source and locks the first oscillator repetition frequency signal output by the first front-end detector to the reference source. The repetition frequency of the first oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the first cavity length locker differs from the repetition frequency of the first oscillator by ±1000 Hz. The first oscillator has a laser cavity, an end mirror of the laser cavity is placed on a first piezoelectric ceramic, and the output signal of the first cavity length locker controls the first piezoelectric ceramic, thereby controlling the cavity length of the laser cavity of the first oscillator, thereby achieving the same repetition frequency of the first oscillator as the reference signal output by the reference source. 7) A portion of the laser light output by the second oscillator is received by a second front-end detector, which inputs the second oscillator repetition frequency signal into a second cavity length locker. The second cavity length locker receives a reference signal from a reference source and locks the second oscillator repetition frequency signal output by the second front-end detector to the reference source. The repetition frequency of the second oscillator repetition frequency signal is in the range of MHz to 100 MHz, and the reference signal output by the reference source to the second cavity length locker differs from the repetition frequency of the second oscillator by ±1000 Hz. The second oscillator has a laser cavity, an end mirror of the laser cavity is placed on a second piezoelectric ceramic, and the output signal of the second cavity length locker controls the second piezoelectric ceramic, thereby controlling the cavity length of the laser cavity of the second oscillator, thereby achieving the same repetition frequency of the second oscillator as the reference signal output by the reference source. 8) The reference source outputs a MHz-hundreds of MHz reference signal to the timing system. The timing system divides the MHz-hundreds of MHz reference signal from the reference source to obtain the required low-repetition-rate clock signal. The repetition rate of the low-repetition-rate clock signal obtained by the timing system is between 100 kHz and 0.1 Hz. At this time, the low-repetition-rate clock signal obtained by the timing system is strictly synchronized with the MHz-hundreds of MHz reference signal from the reference source. Since the repetition rates of the first oscillator and the second oscillator are both locked to the frequency of the reference signal output by the reference source, the laser pulses of the first oscillator and the second oscillator are strictly synchronized. 9) The timing system outputs a low repetition rate clock signal to the first selector, the first front-end pump source, the second selector, the second front-end pump source, and the high-energy pump source; wherein the repetition rate of the low repetition rate clock signal output by the timing system to the first selector and the first front-end pump source is the same; and the repetition rate of the low repetition rate clock signal output by the timing system to the second selector and the second front-end pump source is the same; 10) The laser pulses of the first oscillator and the second oscillator are strictly synchronized, and are synchronized with the reference source. The low repetition frequency clock signal output by the timing system based on the reference source is also strictly synchronized with the reference source. Therefore, there is no time jitter problem in controlling all the components of the entire laser system. When the first front-end amplification system and the second front-end amplification system are not running at the same time, since the outputs of the first front-end amplification system and the second front-end amplification system are strictly synchronized, for the high-energy amplification system, the lasers output by the first front-end amplification system and the second front-end amplification system are the same in time. At this time, there is no need to switch, and the entire laser system can operate directly, thereby enabling the first front-end amplification system or the second front-end amplification system to be quickly connected to the high-energy amplification system.

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