High-speed and high-reliability pulse fiber laser control device and method

Abstract

The invention provides a high-speed and high-reliability pulse fiber laser control device and method, and belongs to the technical field of pulse fiber lasers. Comprising an optical amplifier, a frequency measurement module used for receiving an external frequency control signal, measuring the period of the external frequency control signal and outputting the frequency value of the external frequency control signal; the frequency generation module is in communication connection with the frequency measurement module and is used for receiving the frequency value output by the frequency measurement module and outputting a trigger signal; the pulse generation module is connected with the frequency generation module and the seed driver, and is used for receiving an external pulse width control signal and a trigger signal to obtain a pulse width value and generate a pulse signal; the current control module is used for generating a current control signal according to the pulse width value and the frequency value; the gain adjustment module is used for receiving the current control signal and performing gain adjustment on the optical amplifier; the main controller is used for outputting a switch control signal to the current control module and providing a gain coefficient for the gain adjustment module.

Description

Technical Field

[0001] The present invention relates to the technical field of pulsed fiber lasers, and particularly to a control device and method for a high-speed and highly reliable pulsed fiber laser. Background Art

[0002] In the field of laser industrial processing, especially in high-speed marking systems, indicators such as the frequency, pulse width, and power of the output laser need to be switched in real time at high speed. The conventional method is to independently calculate the current parameters of each stage of the amplifier and send them separately. Such a designed system is relatively complex, consumes excessive resources, and has a high cost. Moreover, when the parameters are switched, each parameter needs to be sent independently, which is not only vulnerable to interference but also affects other modules when sending data. Additionally, when switching at high speed, the parameter sending of each stage cannot be completely synchronized and there is a time difference, ultimately affecting the response time of the fast switching.

[0003] Therefore, it is very necessary to provide a control device and method for a high-speed and highly reliable pulsed fiber laser, which can adjust the synchronization of data sending, reduce the response time of the laser, streamline the system structure, reduce the calculation workload after parameter modification, and stabilize the output power of the laser. Summary of the Invention

[0004] In view of this, the present invention proposes a control device and method for a high-speed and highly reliable pulsed fiber laser, which can simultaneously synchronously drive multiple pumping links of an optical amplifier, separately generate a seed light driving signal, enable the pumping of each stage of the optical amplifier to respond synchronously, and shorten the synchronization time difference.

[0005] On the one hand, the present invention provides a control device for a high-speed and highly reliable pulsed fiber laser, including an optical amplifier, and further including:

[0006] A frequency measurement module, which is used to receive an external frequency control signal, measure the period of the external frequency control signal, and output the frequency value of the external frequency control signal; the frequency measurement module mainly measures the period of the input external frequency control signal. Internally, it uses a counter to count the period of the rising edge of the external frequency control signal; what it outputs is the period value under the counting clock.

[0007] A frequency generation module, which is communicatively connected to the frequency measurement module, and is used to receive the frequency value output by the frequency measurement module and output a trigger signal;

[0008] A pulse generation module, which is communicatively connected to the frequency generation module and is also electrically connected to the seed driver. It is used to receive an external pulse width control signal and a trigger signal, obtain the pulse width value, generate a pulse signal according to the external pulse width control signal, and output the pulse signal according to the trigger signal. The pulse signal is sent to the input stage of the amplifier;

[0009] The current control module is communicatively connected to the frequency generation module and the pulse generation module, and is configured to receive the pulse width value output by the pulse generation module and the frequency value of the external frequency control signal, and generate a current control signal; the current control signal here is the current peak calculated under different frequency values.

[0010] The gain adjustment module is communicatively connected to the current control module, and is configured to receive the current control signal of the current control module and adjust the gain of the optical amplifier.

[0011] The main controller is communicatively connected to the current control module and the gain adjustment module respectively, and is configured to output a switch control signal to the current control module and provide a gain coefficient to the gain adjustment module.

[0012] Based on the above technical solutions, preferably, the optical amplifier includes a seed driver, a first-stage pump driver, a second-stage pump driver, and a third-stage pump driver that are sequentially arranged and optically connected. The seed driver serves as the input stage of the optical amplifier and receives the pulse signal output by the pulse generation module; the first-stage pump driver, the second-stage pump driver, and the third-stage pump driver are respectively electrically connected to the gain adjustment module, and the gain adjustment module adjusts the gain coefficients of the first-stage pump driver, the second-stage pump driver, and the third-stage pump driver.

[0013] Preferably, the gain adjustment module includes a first gain controller, a second gain controller, a third gain controller, a first gain adjustment unit, a second gain adjustment unit, and a third gain adjustment unit.

[0014] The first gain controller, the second gain controller, and the third gain controller are all communicatively connected to the current control module and the main controller. The main controller respectively provides gain coefficients to the first gain controller, the second gain controller, and the third gain controller. The third gain controller is also communicatively connected to the external power control signal. The first gain controller provides a first input signal to the first gain adjustment unit according to the received current control signal and the first gain coefficient, and adjusts the output of the first gain adjustment unit; the second gain controller provides a second input signal to the second gain adjustment unit according to the received analog quantity and the second gain coefficient, and adjusts the output of the second gain adjustment unit; the third gain controller provides a third input signal to the third gain adjustment unit according to the received analog quantity, the third gain coefficient, and the external power control signal, and adjusts the output of the third gain adjustment unit.

[0015] The output end of the first gain adjustment unit is electrically connected to the power input end of the first-stage pump driver, the output end of the second gain adjustment unit is electrically connected to the power input end of the second-stage pump driver, and the output end of the third gain adjustment unit is electrically connected to the power input end of the third-stage pump driver.

[0016] Preferably, the gain adjustment module further includes a digital-to-analog conversion unit and a buffer; the input end of the digital-to-analog conversion unit is electrically connected to the output end of the current control module, the output end of the digital-to-analog conversion unit is electrically connected to the input end of the buffer, and the output end of the buffer is respectively communicatively connected to the first gain controller, the second gain controller, and the third gain controller. The digital-to-analog conversion unit performs analog-to-digital conversion on the received current control signal, and sends the generated analog quantity to the first gain controller, the second gain controller, and the third gain controller through the buffer.

[0017] More preferably, the first gain adjustment unit, the second gain adjustment unit, and the third gain adjustment unit each include an emitter follower, a digital control potentiometer, and a fixed potentiometer; the third gain adjustment unit further includes a multiplier, and the input end of the multiplier is respectively communicatively connected to the output end of the third gain controller and an external power control signal; the input end of the emitter follower receives the analog quantity output by the first gain controller, the analog quantity output by the second gain controller, or the output result of the multiplier. The output end of the emitter follower is electrically connected to one end of the digital control potentiometer, the other end of the digital control potentiometer is electrically connected to one end of the fixed potentiometer, and the other end of the fixed potentiometer is grounded; the common end of the digital control potentiometer and the fixed potentiometer serves as the output end of the first gain adjustment unit, the second gain adjustment unit, and the third gain adjustment unit.

[0018] Even more preferably, the voltage division ratio of the digital control potentiometer and the fixed potentiometer is proportional to the first gain coefficient, the second gain coefficient, or the third gain coefficient.

[0019] Based on the above technical solutions, preferably, it further includes an EEPROM, and the EEPROM is communicatively connected to the main controller for storing data of the gain coefficient.

[0020] On the other hand, the present invention provides a control method for a high-speed and high-reliability pulsed fiber laser, including the following steps:

[0021] S1: Configure the above-mentioned control device for a high-speed and high-reliability pulsed fiber laser;

[0022] S2: Send an external control frequency signal into the frequency measurement module. The frequency measurement module obtains the frequency value of the external frequency control signal and sends the frequency value to the frequency generation module. The frequency generation module is used to generate a trigger signal according to the frequency value; on the one hand, the pulse generation module receives an external pulse width control signal, and on the other hand, it receives the trigger signal sent by the frequency generation module to obtain a pulse width value, and outputs a pulse signal according to the external pulse control signal. The pulse signal is sent into the seed driver of the optical amplifier to generate an initial optical pulse signal;

[0023] S3: The current control module receives the pulse width value output by the pulse generation module on one hand, and the frequency value of the external frequency control signal sent by the frequency generation module on the other hand, and generates a current control signal. The switching state of the current control module is controlled by the switching control signal of the main controller. The current control signal is sent into the gain adjustment module. The gain adjustment module also receives the gain coefficient provided by the main controller. Each gain controller of the gain adjustment module drives the pump drivers at all levels of the optical amplifier through three independent gain adjustment units according to the current control signal and the gain coefficient. The input of the third-stage gain adjustment unit further includes an external power control signal, which is used to adjust the output power of the third-stage pump driver, thereby adjusting the output power of the optical amplifier.

[0024] Preferably, the output I of the current control module is related to the power-down frequency point f0 of the optical amplifier and the frequency value f of the external frequency control signal: when f > f0, I = I p ×(af + b); when f ≤ f0, I = I p ; I p is the peak current of the current control module under different pulses, and a and b are coefficients.

[0025] Preferably, the operating current of the third-stage pump driver is related to the third gain coefficient, the external power control signal, and the current control signal, and satisfies I ma = I dac ×P×kma, where is the operating current of the third-stage pump driver, I dac is the output current signal of the current control module processed by the analog-to-digital conversion unit, P is the output power percentage corresponding to the external power control signal, and kma is the third gain coefficient.

[0026] A high-speed and high-reliability pulse fiber laser control device and method provided by the present invention have the following beneficial effects compared with the prior art:

[0027] (1) The present invention provides a circuit structure that can synchronously drive the optical amplifiers in multiple pump links. By processing the external frequency control signal and pulse width control signal, the current peak value at the corresponding frequency value is obtained. Through the switching adjustment of the main controller, the actual control current signal is obtained, and then through analog-to-digital conversion and buffering, it is respectively provided for the constant current source drive of the pump drivers at all levels. The data of the pump drivers at all levels are synchronized during the processing, and the delay is significantly reduced;

[0028] (2) The third-stage pump driver serves as the main amplifier, and its operating current is directly related to the third gain coefficient, the external power control signal, and the current control signal, which is beneficial to real-time adjustment of the percentage of the output power of the laser to the rated output, meeting the requirements of different processing with variable power. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a structural schematic block diagram of a control device and method for a high-speed and highly reliable pulsed fiber laser of the present invention;

[0031] Figure 2 It is a structural schematic diagram of a first gain adjustment unit and a second gain adjustment unit of a control device and method for a high-speed and highly reliable pulsed fiber laser of the present invention;

[0032] Figure 3 It is a structural schematic diagram of a third gain adjustment unit of a control device and method for a high-speed and highly reliable pulsed fiber laser of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] The output laser frequency, pulse width, power and other indicators of the high-speed marking system are switched in real time at high speed. The conventional method is to independently calculate the current parameters of each stage of the amplifier and issue them separately. Such a designed system is relatively complex, consumes too many resources, has a high cost, and when the parameters are switched, each parameter needs to be issued independently, resulting in asynchronous data processing. In view of this, on the one hand, in combination with Figure 1 it can be seen that the present invention provides a control device for a high-speed and highly reliable pulsed fiber laser, including an optical amplifier: and further including:

[0035] A frequency measurement module, configured to receive an external frequency control signal, measure the period of the external frequency control signal, and output the frequency value of the external frequency control signal;

[0036] A frequency generation module, communicatively connected to the frequency measurement module, is configured to receive the frequency value output by the frequency measurement module and output a trigger signal; the trigger signal follows an external frequency control signal. When there is an external frequency control signal, the frequency generation module outputs a trigger signal that follows the external frequency control signal. When the external frequency control signal does not exist, the frequency generation module does not output a trigger signal either.

[0037] A pulse generation module, communicatively connected to the frequency generation module and also electrically connected to the seed driver, is configured to receive an external pulse width control signal and a trigger signal, obtain a pulse width value, generate a pulse signal according to the external pulse width control signal, and output the pulse signal according to the trigger signal. The pulse signal is sent to the input stage of the amplifier; in this embodiment, the pulse generation module generates electrical pulses with a width of 0.5 - 500 ns. The pulse width value is generated according to the external pulse width control signal. If no new external pulse width control signal is input to the pulse generation module, the pulse width value output by the pulse generation module will maintain the previous value instead of not outputting.

[0038] A current control module, communicatively connected to the frequency generation module and the pulse generation module, is configured to receive the pulse width value output by the pulse generation module and the frequency value of the external frequency control signal, and generate a current control signal. The current control signal is the peak current calculated based on the pulse width value and the frequency value of the external frequency control signal;

[0039] A gain adjustment module, communicatively connected to the current control module, is configured to receive the current control signal of the current control module and adjust the gain of the optical amplifier; corresponding to Figure 1 the dashed box in, and at the same time receive the output of the current control module and the gain provided by the main controller to meet the driving requirements of the constant current sources built in each stage of the optical amplifier.

[0040] A main controller, communicatively connected to the current control module and the gain adjustment module respectively, is configured to output a switch control signal to the current control module and provide a gain coefficient to the gain adjustment module. In addition, the main controller also monitors each link of each optical amplifier in real time for external use or expansion through a communication interface. The main controller can change the output of the current control module to achieve the output of current control signals with different effective values. The gain coefficient can adjust the gain of the pump signals for each link fed into the optical amplifier to meet the actual output requirements.

[0041] In an embodiment of the present invention, the high - speed and high - reliability pulsed fiber laser control device further includes an EEPROM, which is communicatively connected to the main controller and is configured to store data of the gain coefficient for the main controller to call and send.

[0042] As Figure 1As shown, the optical amplifier includes a seed driver, a first-stage pump driver, a second-stage pump driver, and a third-stage pump driver that are sequentially arranged and optically connected. The seed driver serves as the input stage of the optical amplifier and receives the pulse signal output by the pulse generation module. The first-stage pump driver, the second-stage pump driver, and the third-stage pump driver are respectively electrically connected to the gain adjustment module, and the gain adjustment module adjusts the gain coefficients of the first-stage pump driver, the second-stage pump driver, and the third-stage pump driver.

[0043] It should be noted that the gain coefficient is a static gain coefficient obtained through debugging. The gain coefficients of the pump drivers at each stage of the optical amplifier will not be adjusted due to frequency and pulse switching. The adjustment of the gain system is controlled by the main controller. During the debugging stage, the main controller individually confirms the static gain coefficients of the first-stage pump driver, the second-stage pump driver, and the third-stage pump driver, and writes them into the EEPROM after confirmation. After the debugging is completed, each time the high-speed and high-reliability pulsed fiber laser control device is powered on, the gain coefficients stored in the EEPROM are retrieved and written into the gain adjustment module.

[0044] The seed driver generally includes a radio frequency amplifier, a temperature control module, and a laser diode. The pulse signal provided by the pulse generation module cannot directly drive the laser diode. The radio frequency amplifier needs to process the pulse signal to drive the laser diode to generate corresponding optical pulses. The laser diode generates a large amount of heat, which will cause wavelength drift of the optical pulses. Therefore, it is necessary to stabilize the temperature of the laser diode through the temperature control module to ensure the wavelength stability of the output optical pulses of the laser diode. The first-stage pump driver, the second-stage pump driver, and the third-stage pump driver correspond to a common three-stage pump amplification structure. Each pump driver is internally provided with a constant current source and a pump. The constant current source provides a drive signal for the pump, and the constant current source depends on the gain adjustment module for drive and adjustment. The laser diode also correspondingly outputs optical pulses of 0.5 - 500 ns.

[0045] As Figure 1 shown, the gain adjustment module includes a first gain controller, a second gain controller, a third gain controller, a first gain adjustment unit, a second gain adjustment unit, and a third gain adjustment unit;

[0046] The first gain controller, the second gain controller, and the third gain controller are all communicatively connected to the current control module and the main controller. The main controller provides gain coefficients to the first gain controller, the second gain controller, and the third gain controller respectively. The third gain controller is also communicatively connected to an external power control signal. The first gain controller provides a first input signal to the first gain adjustment unit according to the received current control signal and the first gain coefficient, and adjusts the output of the first gain adjustment unit. The second gain controller provides a second input signal to the second gain adjustment unit according to the received analog quantity and the second gain coefficient, and adjusts the output of the second gain adjustment unit. The third gain controller provides a third input signal to the third gain adjustment unit according to the received analog quantity, the third gain coefficient, and the external power control signal, and adjusts the output of the third gain adjustment unit.

[0047] The output terminal of the first gain adjustment unit is electrically connected to the power input terminal of the first-stage pump driver. The output terminal of the second gain adjustment unit is electrically connected to the power input terminal of the second-stage pump driver. The output terminal of the third gain adjustment unit is electrically connected to the power input terminal of the third-stage pump driver.

[0048] The gain adjustment module further includes a digital-to-analog conversion unit and a buffer. The input terminal of the digital-to-analog conversion unit is electrically connected to the output terminal of the current control module. The output terminal of the digital-to-analog conversion unit is electrically connected to the input terminal of the buffer. The output terminal of the buffer is communicatively connected to the first gain controller, the second gain controller, and the third gain controller respectively. The digital-to-analog conversion unit performs analog-to-digital conversion on the received current control signal, and sends the generated analog quantity to the first gain controller, the second gain controller, and the third gain controller through the buffer. The digital-to-analog conversion unit receives the current value sent by the current control signal, converts it into an analog quantity correspondingly, such as a voltage value, and after passing through the buffer, sends it into the first gain controller, the second gain controller, and the third gain controller. Then, each gain controller transfers and outputs it to the corresponding first gain adjustment unit, second gain adjustment unit, and third gain adjustment unit. The outputs of the first gain adjustment unit, the second gain adjustment unit, and the third gain adjustment unit drive the constant current sources built in the first-stage pump driver, the second-stage pump driver, and the third-stage pump driver respectively.

[0049] Similarly, as Figure 1As shown within the dashed-line box, the first gain adjustment unit, the second gain adjustment unit, and the third gain adjustment unit each include an emitter follower, a digitally controlled potentiometer, and a fixed potentiometer; the third gain adjustment unit further includes a multiplier, and the input terminals of the multiplier are respectively communicatively connected to the output terminal of the third gain controller and an external power control signal; the input terminal of the emitter follower receives the analog quantity output by the first gain controller, the analog quantity output by the second gain controller, or the output result of the multiplier, the output terminal of the emitter follower is electrically connected to one end of the digitally controlled potentiometer, the other end of the digitally controlled potentiometer is electrically connected to one end of the fixed potentiometer, and the other end of the fixed potentiometer is grounded; the common terminal of the digitally controlled potentiometer and the fixed potentiometer serves as the output terminal of the first gain adjustment unit, the second gain adjustment unit, and the third gain adjustment unit.

[0050] Combined with Figure 2 and Figure 3 it can be seen that the structures of the first gain adjustment unit and the second gain adjustment unit are completely the same, and both include a first emitter follower U1, a digitally controlled potentiometer R, and a fixed potentiometer R0. The first emitter follower U1 is used to receive the analog quantity, and the output of the first emitter follower U1 drives the constant current sources built in the first-stage pump driver and the second-stage pump driver through the voltage-dividing circuit formed by the digitally controlled potentiometer R and the fixed potentiometer R0. The difference in the structure of the third gain adjustment unit from that of the first gain adjustment unit and the second gain adjustment unit is that it further includes a multiplier. The multiplier performs a multiplication operation on the analog quantity and the external power control signal and then inputs the result into the second emitter follower U2. The output of the second emitter follower U2 drives the constant current source built in the third-stage pump driver through the voltage-dividing circuit formed by the digitally controlled potentiometer R and the fixed potentiometer R0. That is, the input of the third gain adjustment unit simultaneously considers the analog quantity corresponding to the current control signal, the third gain coefficient, and the output power percentage corresponding to the external power control signal.

[0051] As an embodiment of the present invention, the voltage-dividing ratio of the digitally controlled potentiometer and the fixed potentiometer is proportional to the first gain coefficient, the second gain coefficient, or the third gain coefficient.

[0052] On the other hand, the present invention provides a control method for a high-speed and highly reliable pulsed fiber laser, including the following steps:

[0053] S1: Configure the above-mentioned control device for a high-speed and highly reliable pulsed fiber laser;

[0054] S2: The externally controlled frequency signal is sent into the frequency measurement module. The frequency measurement module acquires the frequency value of the external frequency control signal and sends the frequency value to the frequency generation module. The frequency generation module is used to generate a trigger signal according to the frequency value. The pulse generation module receives the external pulse width control signal on the one hand and the trigger signal sent by the frequency generation module on the other hand, obtains the pulse width value, and outputs a pulse signal according to the external pulse control signal. The pulse signal is sent into the seed driver of the optical amplifier to generate an initial optical pulse signal.

[0055] S3: The current control module receives the pulse width value output by the pulse generation module on the one hand and the frequency value of the external frequency control signal sent by the frequency generation module on the other hand, generates a current control signal. The switching state of the current control module is controlled by the switching control signal of the main controller. The current control signal is sent into the gain adjustment module. The gain adjustment module also receives the gain coefficient provided by the main controller. Each gain controller of the gain adjustment module drives the pump drivers of each stage of the optical amplifier through three independent gain adjustment units according to the current control signal and the gain coefficient. The input of the third-stage gain adjustment unit also includes an external power control signal, and the external power control signal is used to adjust the output power of the third-stage pump driver, thereby adjusting the output power of the optical amplifier.

[0056] In one embodiment, the output I of the current control module is related to the power-down frequency point f0 of the optical amplifier and the frequency value f of the external frequency control signal: when f > f0, I = I p ×(af + b); when f ≤ f0, I = I p ; I p is the peak current of the current control module under different pulses, and a and b are coefficients. The device has the maximum single-pulse energy and maximum frequency power at the power-down frequency point f0. When f < f0, the single-pulse energy remains unchanged and the average power decreases linearly. When f > f0, the average power remains unchanged and the single-pulse energy decreases linearly.

[0057] In another example, the working current of the third-stage pump driver is related to the third gain coefficient, the external power control signal, and the current control signal, satisfying I ma = I dac ×P×kma, where is the working current of the third-stage pump driver, I dac is the output current signal of the current control module processed by the analog-to-digital conversion unit, P is the percentage of the rated output power corresponding to the external power control signal, and kma is the third gain coefficient.

[0058] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control device for a high-speed and highly reliable pulsed fiber laser, including an optical amplifier: It is characterized in that, It further includes: A frequency measurement module, configured to receive an external frequency control signal, measure the period of the external frequency control signal, and output the frequency value of the external frequency control signal; A frequency generation module, communicatively connected to the frequency measurement module, configured to receive the frequency value output by the frequency measurement module and output a trigger signal; A pulse generation module, communicatively connected to the frequency generation module and electrically connected to the seed driver, configured to receive an external pulse width control signal and the trigger signal, obtain a pulse width value, generate a pulse signal according to the external pulse width control signal, and output the pulse signal according to the trigger signal. The pulse signal is fed into the input stage of the amplifier; A current control module, communicatively connected to the frequency generation module and the pulse generation module, configured to receive the pulse width value output by the pulse generation module and the frequency value of the external frequency control signal, and generate a current control signal; A gain adjustment module, communicatively connected to the current control module, configured to receive the current control signal of the current control module and adjust the gain of the optical amplifier; A main controller, communicatively connected to the current control module and the gain adjustment module respectively, configured to output a switch control signal to the current control module and provide a gain coefficient to the gain adjustment module.

2. The control device of a high-speed and high-reliability pulsed fiber laser according to claim 1, characterized in that, The optical amplifier includes a seed driver, a first-stage pump driver, a second-stage pump driver, and a third-stage pump driver that are sequentially arranged and optically connected. The seed driver serves as the input stage of the optical amplifier and receives the pulse signal output by the pulse generation module; the first-stage pump driver, the second-stage pump driver, and the third-stage pump driver are electrically connected to the gain adjustment module respectively, and the gain adjustment module adjusts the gain coefficients of the first-stage pump driver, the second-stage pump driver, and the third-stage pump driver.

3. The control device of a high-speed and high-reliability pulsed fiber laser according to claim 2, characterized in that, The gain adjustment module includes a first gain controller, a second gain controller, a third gain controller, a first gain adjustment unit, a second gain adjustment unit, and a third gain adjustment unit; The first gain controller, the second gain controller, and the third gain controller are all communicatively connected to the current control module and the main controller. The main controller provides gain coefficients to the first gain controller, the second gain controller, and the third gain controller respectively. The third gain controller is also communicatively connected to an external power control signal; The first gain controller provides a first input signal to the first gain adjustment unit according to the received current control signal and the first gain coefficient, and adjusts the output of the first gain adjustment unit; The second gain controller provides a second input signal to the second gain adjustment unit according to the received analog quantity and the second gain coefficient, and adjusts the output of the second gain adjustment unit; The third gain controller provides a third input signal to the third gain adjustment unit according to the received analog quantity, the third gain coefficient, and the external power control signal, and adjusts the output of the third gain adjustment unit; The output end of the first gain adjustment unit is electrically connected to the power input end of the first-stage pump driver, the output end of the second gain adjustment unit is electrically connected to the power input end of the second-stage pump driver, and the output end of the third gain adjustment unit is electrically connected to the power input end of the third-stage pump driver.

4. A high-speed and high-reliability pulsed fiber laser control device according to claim 3, characterized in that The gain adjustment module further includes a digital-to-analog conversion unit and a buffer; the input end of the digital-to-analog conversion unit is electrically connected to the output end of the current control module, the output end of the digital-to-analog conversion unit is electrically connected to the input end of the buffer, and the output end of the buffer is respectively communicatively connected to the first gain controller, the second gain controller, and the third gain controller. The digital-to-analog conversion unit performs analog-to-digital conversion on the received current control signal, and sends the generated analog quantity to the first gain controller, the second gain controller, and the third gain controller through the buffer.

5. The control device for a high-speed and high-reliability pulsed fiber laser according to claim 3, wherein The first gain adjustment unit, the second gain adjustment unit, and the third gain adjustment unit each include an emitter follower, a digital control potentiometer, and a fixed potentiometer; the third gain adjustment unit further includes a multiplier, and the input end of the multiplier is respectively communicatively connected to the output end of the third gain controller and an external power control signal; the input end of the emitter follower receives the analog quantity output by the first gain controller, the analog quantity output by the second gain controller, or the output result of the multiplier. The output end of the emitter follower is electrically connected to one end of the digital control potentiometer, the other end of the digital control potentiometer is electrically connected to one end of the fixed potentiometer, and the other end of the fixed potentiometer is grounded; the common end of the digital control potentiometer and the fixed potentiometer serves as the output end of the first gain adjustment unit, the second gain adjustment unit, and the third gain adjustment unit.

6. The high-speed and high-reliability pulsed fiber laser control device according to claim 5, wherein, The voltage division ratio of the digital control potentiometer and the fixed potentiometer is proportional to the first gain coefficient, the second gain coefficient, or the third gain coefficient.

7. A control device for a high-speed and high-reliability pulsed fiber laser according to claim 1, characterized in that, It further includes an EEPROM, which is communicatively connected to the main controller and is used to store the data of the gain coefficient.

8. A control method for a high-speed and high-reliability pulsed fiber laser, characterized in that, It includes the following steps: S1: Configure the high-speed and high-reliability pulsed fiber laser control device according to any one of claims 3-7. S2: The external control frequency signal is sent into the frequency measurement module. The frequency measurement module obtains the frequency value of the external frequency control signal and sends the frequency value to the frequency generation module. The frequency generation module is used to generate a trigger signal according to the frequency value; on the one hand, the pulse generation module receives the external pulse width control signal, and on the other hand, it receives the trigger signal sent by the frequency generation module to obtain the pulse width value, and outputs a pulse signal according to the external pulse control signal, and sends the pulse signal into the seed driver of the optical amplifier to generate an initial optical pulse signal. S3: The current control module, on the one hand, receives the pulse width value output by the pulse generation module, and on the other hand, receives the frequency value of the external frequency control signal sent by the frequency generation module to generate a current control signal. The switching state of the current control module is controlled by the switching control signal of the main controller. The current control signal is sent into the gain adjustment module. The gain adjustment module also receives the gain coefficient provided by the main controller. Each gain controller of the gain adjustment module drives the pump drivers of each stage of the optical amplifier through three independent gain adjustment units according to the current control signal and the gain coefficient. The input of the third-stage gain adjustment unit further includes an external power control signal, and the external power control signal is used to adjust the output power of the third-stage pump driver, thereby adjusting the output power of the optical amplifier.

9. A control method for a high-speed and high-reliability pulsed fiber laser according to claim 8, characterized in that, The output I of the current control module is related to the power-down frequency point f0 of the optical amplifier and the frequency value f of the external frequency control signal: when f > f0, I = I p ×(af + b); when f ≤ f0, I = I p ; I p is the peak current of the current control module under different pulses, and a and b are coefficients.

10. A control method for a high-speed and high-reliability pulsed fiber laser according to claim 8, characterized in that, The operating current of the third-stage pump driver is related to the third gain coefficient, the external power control signal, and the current control signal, and satisfies I ma = I dac × P × kma, where is the operating current of the third-stage pump driver, I dac is the output current signal of the current control module processed by the analog-to-digital conversion unit, P is the output power percentage corresponding to the external power control signal, and kma is the third gain coefficient.

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