Pulse spectrum synthesis system and method

Abstract

The invention provides a pulse spectrum synthesis system and method, and relates to the field of spectrum synthesis. The pulse fiber laser sub-beam comprises a pulse seed source used for outputting pulse laser as signal light; the continuous seed source is used for outputting continuous laser as reference light, the wavelength of the reference light is different from that of the center pulse of the signal light, and the average power of the reference light is smaller than that of the signal light; the wavelength division multiplexer is respectively connected with the pulse seed source and the continuous seed source and is used for synthesizing the signal light and the reference light into one path as synthesized light; and the signal amplifier is connected with the wavelength division multiplexer and is used for amplifying the signal light and the reference light to form amplified synthetic light. Reference continuous light is coupled into the amplifier through the optical coupler, so that amplification of continuous components of signal light is restrained, the number of upper-energy-level particles is consumed, ASE is restrained, the signal-to-noise ratio of laser output is increased, and the efficiency of the laser is improved.

Description

Technical Field

[0001] This invention relates to the field of spectral synthesis, and more particularly to a pulsed spectral synthesis system and method. Background Technology

[0002] High-power hyperspectral pulsed laser combining optical systems contain multiple optical surfaces such as lenses, gratings, polarizers, and windows. The propagation path of the laser beam within the system is quite complex. The optical combining components need to transmit kilojoules to tens of thousands of joules, while stray light reaches hundreds to kilojoules. If stray light is located near optical elements, the near-concentrated energy will cause thermal deformation of the elements, severely affecting the quality of the output beam and even damaging the optical surfaces of the optical elements. Aesthetic surfaces (ASE) in the combining laser sub-beam are the main source of stray light in such systems.

[0003] Pulsed fiber lasers currently mostly employ the master oscillator power amplifier (MOPA) principle, achieving high-power output through multi-stage fiber amplification of a low-peak-power seed laser. When the seed light is weak and the inter-pulse duration is too long, stimulated spontaneous emission (ASE) noise is generated during fiber amplification. This consumes a significant amount of upper-level particles and reduces the energy stored in the active fiber. As a major influencing factor in fiber lasers, ASE should be suppressed as much as possible. For fiber amplifiers with a master oscillator power amplifier (MOPA) structure, ASE generated in the preceding stage of the amplification path will also be amplified in the next stage. Therefore, if ASE in the preceding stage is not well suppressed, the final amplified output will have a high ASE level, reducing the proportion of the pulse signal and the efficiency of the fiber amplification stage, which is detrimental to obtaining higher peak power and pulse stability through subsequent amplification. Summary of the Invention

[0004] The purpose of this invention is to provide a pulsed spectral synthesis scheme. This method fundamentally suppresses amplified spontaneous emission (ASE) in pulsed fiber lasers by introducing a reference continuous light into the pulsed synthesis sub-beam, thereby reducing stray light power in the synthesis system. Moreover, the reference continuous light and the pulsed signal light are transmitted in the same fiber, which can be used as a reference light in the synthesis pointing adjustment process, and the dynamic pointing can be monitored in real time.

[0005] A first aspect of this invention provides a pulsed spectral synthesis system, comprising: a pulsed fiber laser sub-beam; the pulsed fiber laser sub-beam comprising: a pulsed seed source for outputting pulsed laser light as a signal light; a continuous seed source for outputting continuous laser light as a reference light, wherein the wavelength of the reference light is different from the wavelength of the center pulse of the signal light, and the average power of the reference light is less than the average power of the signal light; a wavelength division multiplexer connected to the pulsed seed source and the continuous seed source respectively, for combining the signal light and the reference light into a single path as a synthesized light; and a signal amplifier connected to the wavelength division multiplexer for amplifying the signal light and the reference light to form amplified synthesized light.

[0006] In some embodiments, the pulse spectral synthesis system further includes: a direction adjustment element for reflecting the amplified synthesized light and adjusting the emission direction of the amplified synthesized light; and a detection element for detecting the output direction of the amplified reference light in the amplified synthesized light.

[0007] In some embodiments, the pulsed fiber laser sub-beams have multiple sub-beams; the direction adjustment element is used to adjust the emission direction of each of the amplified composite beams by reflection.

[0008] In some embodiments, the number of the direction adjustment element is one; the pulse spectrum synthesis system further includes: multiple beam arrangement units, each connected to the output end of a sub-beam of each pulsed fiber laser, for directing the signal light output from each pulse seed source toward the same position of the direction adjustment element.

[0009] In some embodiments, the pulsed fiber laser sub-beam further includes: a pre-amplification element for performing a first-stage amplification on the synthesized light output from the wavelength division multiplexer; a gain fiber for receiving the first-stage amplified synthesized light; and a pump source for providing gain laser light into the gain fiber.

[0010] In some embodiments, the pulsed fiber laser sub-beam further includes an isolator located between the pre-amplification element and the gain fiber, for allowing the synthesized light to be transmitted from the pre-amplification element to the gain fiber.

[0011] In some embodiments, the pulsed fiber laser sub-beam further includes a cladding stripper connected to the output end of the gain fiber.

[0012] In some embodiments, the pulsed fiber laser sub-beam further includes an end cap connected to the output end of the cladding stripper.

[0013] A second aspect of this invention provides a pulse spectrum synthesis method, which is implemented using the pulse spectrum synthesis system provided in the first aspect of the above embodiments. The pulse spectrum synthesis system includes: controlling a pulse seed source to output a pulse signal as a signal light; controlling a continuous seed source to output a continuous laser as a reference light, and combining the signal light and the reference light into a single path using a wavelength division multiplexer as a synthesized light; controlling a signal amplifier to amplify the synthesized light to obtain amplified synthesized light; and removing the portion of the amplified synthesized light that has the same frequency as the reference light to obtain the target pulse spectrum.

[0014] In some embodiments, the pulse spectrum synthesis system further includes a direction adjustment element and a detection element; the control signal amplifier amplifies the synthesized light to obtain amplified synthesized light, and between removing the portion of the amplified synthesized light that has the same frequency as the reference light to obtain the target pulse spectrum, the pulse spectrum synthesis method further includes: obtaining the direction of the amplified reference light in the amplified synthesized light based on the detection element, and using the direction adjustment element to make the amplified reference light point to the target direction, so that the amplified signal light in the amplified synthesized light points to the target direction.

[0015] This invention provides a pulsed spectral synthesis system, comprising a pulsed fiber laser sub-beam. The sub-beam includes a pulsed seed source for outputting pulsed laser light as a signal light, a continuous seed source for outputting continuous laser light as a reference light, a wavelength division multiplexer connected to the pulsed seed source and the continuous seed source respectively for combining the signal light and the reference light into a single synthesized light, and a signal amplifier connected to the wavelength division multiplexer for amplifying the signal light and the reference light. The wavelength of the reference light differs from the wavelength of the center pulse of the signal light, thus preventing interference between the center pulses of the continuous laser and the pulsed laser. The continuous components in the continuous laser and the pulsed laser are superimposed and amplified together. During amplification, the continuous laser occupies the amplification capacity of the signal amplifier, thereby suppressing the amplification effect of the signal amplifier on the continuous components in the pulsed laser, thus suppressing stimulated spontaneous emission noise and improving the signal-to-noise ratio of the amplified signal. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a pulsed fiber laser sub-beam in a pulsed spectral synthesis system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a pulse spectral synthesis system provided in an embodiment of the present invention; Figure 3 This is a schematic flowchart of a pulse spectrum synthesis method provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures 1. Pulsed fiber laser sub-beam; 2. Beam arrangement unit; 3. Direction adjustment component; 4. Detection element; 1.1 Pulse seed source; 1.2 Wavelength division multiplexer; 1.3 Continuous seed source; 1.4 Preamplifier; 1.5 Isolator; 1.6 Pump combiner; 1.7 Pump source; 1.8 Gain fiber; 1.9 Cladding stripper; 1.10 End cap. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The specific technical features described in the various embodiments in the detailed implementation can be combined in various ways without contradiction. For example, different implementation methods can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this invention will not be described separately.

[0020] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0021] Additionally, it should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate any similarity or connection between them. It should be understood that the directional descriptions such as "above," "below," "inside," and "outside" refer to the orientation under normal use conditions.

[0022] In some embodiments, such as Figure 1As shown, the pulsed spectral synthesis system includes a pulsed fiber laser sub-bundle 1, which comprises a pulsed seed source 1.1, a continuous seed source 1.3, a wavelength division multiplexer 1.2, and a signal amplifier. The pulsed seed source 1.1 outputs pulsed laser light as a signal light, and the continuous seed source 1.3 outputs continuous laser light as a reference light. The wavelength of the reference light differs from that of the signal light, and the average power of the reference light is less than that of the signal light. For example, the reference light is a sine wave with a fixed wavelength. The wavelength division multiplexer 1.2 is connected to both the pulsed seed source 1.1 and the continuous seed source 1.3. The signal light output from the pulsed seed source 1.1 and the reference light output from the continuous seed source 1.3 are combined in the wavelength division multiplexer 1.2 into a single path, serving as the synthesized light.

[0023] A signal amplifier is used to amplify the synthesized light. This can be understood as simultaneously amplifying both the continuous light portion and the signal light portion of the synthesized light. The signal light is a pulsed signal, which includes a central pulse component and a continuous component. In a spectral synthesis system, amplifying the central pulse yields the target pulse spectrum. The continuous component, after amplification, forms unwanted stray light. The less stray light in the amplified light signal, the higher the overlap between the amplified light signal and the target light. Furthermore, stray light is generally considered noise in the light signal; therefore, the less stray light in the amplified light signal, the lower the signal-to-noise ratio. It should be noted that superimposing the pulsed laser and the continuous laser before amplification results in… The center pulses of pulsed lasers and continuous lasers have different wavelengths, so the two lasers will not interfere. Since the average power of the continuous laser is less than the average power of the signal light, the maximum amplitude of the continuous laser is less than the maximum amplitude of the center pulse of the pulsed laser. This prevents the amplified continuous laser from having an excessive impact on the center pulse of the pulsed laser. At the same time, the continuous laser will superimpose with the continuous part of the pulsed laser. When the signal amplifier amplifies the continuous part, the continuous laser will consume photons in the signal amplifier, thereby occupying the amplification capability of the signal amplifier for the continuous part. This suppresses the effect of the signal amplifier on the continuous component in the pulsed laser, thereby suppressing stimulated spontaneous emission noise and improving the signal-to-noise ratio of the amplified signal.

[0024] Optionally, the amplitude of the continuous laser is smaller than that of the center pulse of the pulsed laser, but the amplitude of the continuous laser is greater than that of the continuous component in the pulsed laser. This reduces the influence of the continuous laser on the amplification capability of the center pulse during signal amplification. At the same time, after the continuous laser and the continuous component of the pulsed laser are combined, the proportion of the continuous laser is larger. During the amplification process, the continuous laser can consume more photons, thereby allowing the continuous laser to occupy more of the amplification capability of the signal amplifier and further suppressing the amplification effect of the signal amplifier on the continuous component in the pulsed laser.

[0025] Optionally, after the synthesized light is amplified, the amplified continuous signal in the amplified signal can be processed by filtering or other signal processing methods to obtain the target spectrum. Moreover, since the continuous laser is a fixed frequency light signal and the frequency remains unchanged after amplification, the amplified continuous laser can be easily removed by processing the fixed frequency.

[0026] This invention provides a pulsed spectral synthesis system, comprising a pulsed fiber laser sub-beam. The sub-beam includes a pulsed seed source for outputting pulsed laser light as a signal light, a continuous seed source for outputting continuous laser light as a reference light, a wavelength division multiplexer connected to the pulsed seed source and the continuous seed source respectively for combining the signal light and the reference light into a single synthesized light, and a signal amplifier connected to the wavelength division multiplexer for amplifying the signal light and the reference light. The wavelength of the reference light differs from the wavelength of the center pulse of the signal light, thus preventing interference between the center pulses of the continuous laser and the pulsed laser. The continuous components in the continuous laser and the pulsed laser are superimposed and amplified together. During amplification, the continuous laser occupies the amplification capacity of the signal amplifier, thereby suppressing the amplification effect of the signal amplifier on the continuous components in the pulsed laser, thus suppressing stimulated spontaneous emission noise and improving the signal-to-noise ratio of the amplified signal.

[0027] In some embodiments, such as Figure 2 As shown, the pulsed spectral synthesis system also includes a direction adjustment component 3 and a detection element 4. The direction adjustment component 3 is used to reflect the direction of the amplified synthesized light output from the pulsed fiber laser sub-beam 1. For example, the detection element 4 can detect the direction of the amplified reference light in the amplified synthesized light. Since the amplified signal light and the amplified reference light are transmitted in the same fiber, the amplified signal light and the amplified reference light have the same direction. By rotating the direction adjustment component 3, the direction of the amplified reference light can be directed to the target direction. At this time, the amplified signal light in the amplified synthesized light can also be directed to the target direction.

[0028] In some embodiments, such as Figure 2 As shown, there are multiple pulsed fiber laser sub-beams 1, each of which outputs amplified and synthesized light. The amplified and synthesized light output by the multiple pulsed fiber laser sub-beams 1 can synthesize different forms of spectrum as needed. The direction adjustment component 3 can adjust the output direction of the amplified and synthesized light output by each pulsed fiber laser sub-beam 1.

[0029] Optionally, the number of direction adjustment elements 3 is the same as the number of pulsed fiber laser sub-bundles 1, and the direction of the amplified and synthesized light output from each pulsed fiber laser sub-bundle 1 is adjusted by the direction adjustment elements 3.

[0030] In some embodiments, such as Figure 2 As shown, the number of direction adjustment components 3 is one. The pulse spectrum synthesis system also includes multiple beam arrangement units 2, which are used to direct the amplified and synthesized light output from each pulse fiber laser sub-beam 1 to the same position of the direction adjustment component 3, so that the amplified and synthesized light can be synthesized into one path after being output.

[0031] In some embodiments, such as Figure 1 As shown, the pulsed fiber laser sub-beam 1 also includes a pre-amplification element 1.4, a gain fiber 1.8, and a pump source 1.7. The pre-amplification element 1.4 is used to perform a first-stage amplification on the synthesized light output from the wavelength division multiplexer 1.2; the gain fiber 1.8 is used to receive the synthesized light after the first-stage amplification; and the pump source 1.7 is used to provide gain laser light into the gain fiber, thereby performing a second-stage amplification on the synthesized light after the first-stage amplification within the gain fiber 1.8. This can be understood as reducing the amplification factor required for single-machine amplification through multi-stage amplification, effectively suppressing nonlinear effects such as SBS (stimulated Brillouin scattering), SRS (stimulated Raman scattering), and ASE (stimulated spontaneous emission) effects. Optionally, such as... Figure 1 As shown, the pulse spectral synthesis system also includes a pump combiner 1.6, and the optical output fibers of multiple pump sources 1.7 are connected to the pump fibers of the pump combiner 1.6 by optical fiber fusion splicing.

[0032] In some embodiments, such as Figure 1 As shown, the pulsed fiber laser sub-beam 1 also includes an isolator 1.5, which is located between the pre-amplifier element 1.4 and the gain fiber 1.8. The isolator 1.5 allows the synthesized light to be transmitted from the pre-amplifier element 1.4 to the gain fiber 1.8, and prevents the pump laser from being transmitted to the pre-amplifier element 1.4, so that the pump laser can act entirely within the gain fiber 1.8, thereby improving the amplification effect.

[0033] In some embodiments, such as Figure 1 As shown, the pulsed fiber laser sub-beam 1 also includes a cladding stripper 1.9, which is connected to the output end of the gain fiber 1.8. Optionally, as... Figure 1 As shown, the pulsed fiber laser sub-beam 1 also includes an end cap 1.10, which is connected to the output end of the cladding stripper 1.9.

[0034] In some embodiments, such as Figure 2 As shown, the pulsed spectral synthesis system includes: a pulsed fiber laser sub-beam 1, a beam arrangement unit 2, a diffraction grating (direction adjustment element 3), and a detector element 4. Among them, as... Figure 1 As shown, the pulsed fiber laser sub-bundle 1 includes at least: a pulse seed source 1.1, a wavelength division multiplexer 1.2, a continuous seed source 1.3, a preamplifier 1.4, an isolator 1.5, a pump combiner 1.6, a pump source 1.7, a gain fiber 1.8, a cladding stripper 1.9, and an end cap 1.10.

[0035] The output pigtail of sub-beam 1 of the three-pulsed fiber laser is connected to beam arrangement unit 2. The pulsed signal light output from sub-beam 1 is combined into a main laser beam through a diffraction grating (direction adjustment element 3). The reference continuous light and the pulsed signal light are transmitted in the same fiber. The reference continuous signal light output from sub-beam 1 serves as the reference light during the synthesis and pointing adjustment process.

[0036] Pulse seed source 1.1 and continuous seed source 1.3 are respectively connected to the two input arms of wavelength division multiplexer 1.2; wavelength division multiplexer 1.2, preamplifier 1.4, isolator 1.5, pump combiner 1.6, gain fiber 1.8, cladding stripper 1.9, and end cap 1.10 are sequentially connected into a single unit via fiber optic fusion splicing; the optical output fiber of pump source 1.7 is connected to the pump fiber of pump combiner 1.6 into a single unit via fiber optic fusion splicing. After connection, during laser operation, the pulse signal light emitted by pulse seed source 1.1 and the reference continuous light emitted by continuous seed source 1.3 enter the main optical path through the two input arms of wavelength division multiplexer 1.2.

[0037] In some embodiments, the pump laser in pump source 1.7 is a 976 nm wavelength-locked semiconductor laser with a total power of 200 W. The pulsed seed source 1.1 outputs pulsed signal light with wavelengths of 1062 nm, 1064 nm, and 1066 nm, a frequency of 10 kHz, a pulse width of 10 nanoseconds, and an average power of 1 mW. The continuous seed source 1.3 outputs continuous light with wavelengths of 1100 nm, 1102 nm, and 1104 nm, and an average power of 0.1 mW. The optical fibers of pulsed seed source 1.1, continuous seed source 1.3, and wavelength division multiplexer 1.2 are 10 / 125 fiber. The preamplifier 1.4 is pumped by core pumping or cladding pumping, using 10 / 125 fiber. The gain fiber 1.8 is a 30 / 250 ytterbium-doped fiber, and the pump light absorption is 20 dB.

[0038] In some embodiments, the pump laser in pump source 1.7 is a 940nm wavelength-locked semiconductor laser with a total power of 50W. The pulsed seed source 1.1 outputs pulsed signal light with wavelengths of 1572nm, 1574nm, and 1576nm, a frequency of 100kHz, a pulse width of 4ns, and an average power of 10mW. The continuous seed source 1.3 outputs continuous light with wavelengths of 1600nm, 1602nm, and 1604nm, and an average power of 1mW. The optical fibers of pulsed seed source 1.1, continuous seed source 1.3, and wavelength division multiplexer 1.2 are 10 / 125 fiber. The preamplifier 1.4 is pumped using core pumping or cladding pumping, with 10 / 125 fiber. The gain fiber 1.8 is a 20 / 130 erbium-ytterbium co-doped fiber, and the pump light absorption is 20dB.

[0039] Using this embodiment, a single-mode signal laser output with an average output power greater than 20W and a reference continuous light output with an average power of 100mW can be obtained.

[0040] The pulsed signal light and the reference continuous light output from the sub-beam 1 of the three-channel pulsed fiber laser are focused at different positions by a diffraction grating. The direction of the synthesis system can be adjusted in real time by the direction of the reference continuous light.

[0041] This invention also provides a pulse spectrum synthesis method, which involves, as follows: Figure 1 and Figure 2 The pulse spectrum synthesis system shown is implemented.

[0042] In some embodiments, such as Figure 3 As shown, the pulse spectrum synthesis method includes: Step S101: Control the pulse seed source to output a pulse signal as signal light; Step S102: Control the continuous seed source to output continuous laser light as reference light, and combine the signal light and reference light into one path through a wavelength division multiplexer as the combined light; Step S103: The control signal amplifier amplifies the synthesized light to obtain amplified synthesized light; Step S104: Remove the portion of the amplified composite light that has the same frequency as the reference light to obtain the pulse spectrum of the target.

[0043] Optionally, removing the portion of the amplified composite light that has the same frequency as the reference light can be achieved by a filter element. This filter element can absorb light waves of a specific frequency in the amplified composite light and allow other light waves to pass through. By making the frequency of the light absorbed by the filter element the same as the frequency of the reference light, the amplified reference light portion in the amplified composite light can be removed, thereby obtaining a target spectrum that includes only the amplified signal light.

[0044] Optionally, the amplified reference light in the amplified composite light can also be removed through signal processing. That is, the amplified composite light is converted into an electrical signal through the photoelectric effect, and the signal is subjected to Fourier transform to obtain the frequency domain signal of the electrical signal. After removing the part of the reference light corresponding to the frequency domain signal, the inverse Fourier transform is performed to obtain an electrical signal that only contains the amplified signal light. The electrical signal is then converted into an optical signal through photoelectric conversion to obtain the target spectrum.

[0045] In some embodiments, the pulse spectral synthesis system further includes a direction adjustment element and a detection element; Figure 1Between steps S103 and S104, the pulse spectrum synthesis method further includes: obtaining the direction of the amplified reference light in the amplified synthesized light based on the detection element, and using the direction adjustment element to make the amplified reference light point to the target direction, so that the amplified signal light in the amplified synthesized light points to the target direction, thereby making the amplified synthesized light point to the target direction.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A pulsed spectrum synthesis system, characterized in that, The pulsed spectral synthesis system includes a pulsed fiber laser sub-beam; The pulsed fiber laser sub-beam includes: A pulse seed source is used to output pulsed laser light as a signal light. A continuous seed source is used to output continuous laser light as a reference light, wherein the wavelength of the reference light is different from the wavelength of the center pulse of the signal light, and the average power of the reference light is less than the average power of the signal light; A wavelength division multiplexer is connected to the pulse seed source and the continuous seed source respectively, and is used to combine the signal light and the reference light into a single path as the combined light. A signal amplifier, connected to the wavelength division multiplexer, is used to amplify the signal light and the reference light to form amplified composite light.

2. The pulse spectral synthesis system according to claim 1, characterized in that, The pulse spectral synthesis system also includes: A direction adjustment component is used to reflect the amplified composite light and adjust the emission direction of the amplified composite light; A detection element is used to detect the output direction of the amplified reference light in the amplified composite light.

3. The pulse spectral synthesis system according to claim 2, characterized in that, The pulsed fiber laser sub-beam has multiple sub-beams; The direction adjustment element is used to adjust the emission direction of each of the amplified composite beams by reflection.

4. The pulse spectral synthesis system according to claim 3, characterized in that, The number of the direction adjustment components is one; The pulse spectral synthesis system further includes: multiple beam arrangement units, each connected to the output end of a sub-beam of a pulsed fiber laser, for directing the signal light output from each pulse seed source toward the same position of the direction adjustment component.

5. The pulse spectral synthesis system according to claim 1, characterized in that, The pulsed fiber laser sub-beam also includes: A pre-amplification element is used to amplify the synthesized light output from the wavelength division multiplexer in one stage; Gain fiber, used to receive the synthesized light after first-stage amplification; A pump source is used to provide gain laser light into the gain fiber.

6. The pulse spectral synthesis system according to claim 5, characterized in that, The pulsed fiber laser sub-beam also includes: An isolator, located between the pre-amplification element and the gain fiber, is used to allow the synthesized light to be transmitted from the pre-amplification element to the gain fiber.

7. The pulse spectral synthesis system according to claim 5, characterized in that, The pulsed fiber laser sub-beam also includes: A cladding stripper is connected to the output end of the gain fiber.

8. The pulse spectral synthesis system according to claim 7, characterized in that, The pulsed fiber laser sub-beam also includes: The end cap is connected to the output end of the cladding light stripper.

9. A method for synthesizing pulsed spectra, characterized in that, The pulse spectrum synthesis method is implemented using the pulse spectrum synthesis system as described in any one of claims 1 to 8, and the pulse spectrum synthesis method includes: The pulse seed source is controlled to output a pulse signal as signal light; The continuous seed source is controlled to output a continuous laser as a reference light, and the signal light and the reference light are combined into a single path by the wavelength division multiplexer as a composite light. The control signal amplifier amplifies the synthesized light to obtain amplified synthesized light; The portion of the amplified composite light that has the same frequency as the reference light is removed to obtain the pulse spectrum of the target.

10. The pulse spectrum synthesis method according to claim 9, characterized in that, The pulse spectral synthesis system also includes a direction adjustment element and a detection element; The control signal amplifier amplifies the synthesized light to obtain amplified synthesized light. Between this amplified synthesized light and the step of removing the portion of the amplified synthesized light with the same frequency as the reference light to obtain the target pulse spectrum, the pulse spectrum synthesis method further includes: The direction of the amplified reference light in the amplified composite light is obtained based on the detection element, and the direction adjustment element is used to make the amplified reference light point to the target direction, so that the amplified signal light in the amplified composite light points to the target direction.

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