High-power pulse width repetition frequency tunable laser

Abstract

The invention relates to the technical field of laser, and provides a high-power pulse width repetition frequency tunable laser, which comprises an input and output light path configured to input seed light and output amplified laser; a regenerative amplifier optical path configured to amplify the input seed light; and the pulse width compression module is configured to perform pulse width compression on the amplified seed light and output high-power pulse laser with tunable pulse width, and the pulse width compression module comprises a third polarizing beam splitter, a third 1 / 2 wave plate, a first electric control transverse movement plane mirror, a second electric control transverse movement plane mirror, a nonlinear crystal and a fourth plane mirror. On the basis of a nonlinear crystal multi-pass compression method, a high-power disc laser is built, pulse width compression is carried out on an annular cavity which contains a nonlinear crystal and a 1 / 2 wave plate or is added into a Pockels cell, and a high-power pulse width repetition frequency tunable pulse string is finally obtained by transversely moving a plane mirror through electric control.

Description

Technical Field

[0001] The present application relates to the field of laser technology, and in particular to a high-power pulse width and repetition rate tunable laser. Background Art

[0002] The innovation of high-power ultrashort laser technology is constantly promoting the development of high-energy physics, fusion energy, precision measurement, fine micro-machining, biomedicine and other application fields. The size of the laser pulse width directly affects the energy density and peak power of the laser pulse, which in turn affects the effect of the interaction between the laser and matter. Existing laser pulse width compression is generally achieved by using a grating pair compressor. The working principle of the grating pair compressor is that when the positive chirp pulse passes through a parallel grating, different spectral components experience different optical paths, and the optical path experienced by the long wavelength is greater than that of the short wavelength. The negative dispersion compensation positive chirp conjugated with the stretcher is introduced to achieve pulse compression. However, it is difficult to solve the technical problems of high-power laser pulse compression. Summary of the invention

[0003] Some embodiments of the present application provide a high-power pulse width and repetition rate tunable laser, including: An input and output optical path, configured to input seed light and output amplified laser light, the input and output optical path comprising: a seed light source, a first plane reflector, a first 1 / 2 wave plate, a first polarization beam splitter, a Faraday rotator and a second 1 / 2 wave plate; A regenerative amplifier optical path is configured to amplify the input seed light, and the regenerative amplifier optical path includes: a second polarization beam splitter, a first Pockels cell, a quarter wave plate, a second plane reflector, a concave reflector, a spherical reflector, a third plane reflector and a disk module; A pulse width compression module is configured to compress the pulse width of the amplified seed light and output a high-power pulse laser with tunable pulse width, wherein the pulse width compression module comprises: a third polarization beam splitter, a third 1 / 2 wave plate, a first electrically controlled transversely movable plane reflector, a second electrically controlled transversely movable plane reflector, a nonlinear crystal 17 and a fourth plane reflector; The seed light source outputs a broadened ns-level s-polarized seed light, and the seed light passes through a first plane reflector and a first 1 / 2 wave plate, and the s-polarized seed light is converted into a p-polarized seed light, and then passes through a first polarization beam splitter, a Faraday rotator and a second 1 / 2 wave plate to enter the regenerative amplifier optical path; The seed light entering the optical path of the regenerative amplifier passes through the first Pockels cell, the quarter wave plate, the second plane reflector, and the concave reflector. After being reflected by the concave reflector, the seed light returns along the original path and passes through the second plane reflector, the quarter wave plate, the first Pockels cell, the second polarization beam splitter, the spherical reflector, and the third plane reflector in sequence to reach the disc module. After being amplified by the disc module, the seed light returns along the original path and is amplified back and forth in the resonant cavity. The amplified seed light is output from the first polarization beam splitter to the first Pockels cell of the pulse width compression module. The laser is cyclically compressed in the pulse width compression module. The polarization direction of the linearly polarized light can be rotated by rotating the angle of the third 1 / 2 wave plate, and the compression amount can be controlled by controlling the dispersion of the nonlinear crystal. The pulse width can be compressed once after each circle, thereby outputting a pulse train with tunable pulse width.

[0004] In some embodiments, the pulse width compression module further includes: a second Pockels cell disposed between the third polarization beam splitter and the second 1 / 2 wave plate.

[0005] In some embodiments, the repetition frequency of the pulse train is adjusted by adjusting the first electrically-controlled transversely movable plane reflector and the second electrically-controlled transversely movable plane reflector.

[0006] In some embodiments, the regenerative amplifier optical path further comprises: The pump source is used to output pump light to pump the disk module 21 .

[0007] In some embodiments, the disc module includes at least one of the following: Yb:YAG, Yb:KGW, Yb:LuScO3, Yb:CALGO, Ho:YAG, Ho:KYW, Tm:YAG, Tm:KYW, Cr:ZnSe and Tm:LLF.

[0008] In some embodiments, it also includes: The control module adjusts the falling edge voltage of the second Pockels cell so that the pulse width of the pulse train gradually decreases while changing the polarization state, thereby outputting a high-power pulse train with tunable pulse width.

[0009] In some embodiments, the pulse width of the pulse train is a ps-level pulse.

[0010] In some embodiments, the minimum diameter of the light spot of the amplified light path in the disc regeneration amplifier cavity is 2 mm-2.1 mm.

[0011] Compared with the related art, the above solution of the embodiment of the present application has at least the following beneficial effects: The present invention proposes a new type of laser with adjustable output pulse width and repetition rate, and can realize pulse train laser output. Based on the nonlinear crystal multi-pass compression method, the present invention builds a high-power disk laser, which contains a nonlinear crystal and a 1 / 2 wave plate or a ring cavity with a Pockels cell for pulse width compression, and finally obtains a high-power pulse train with tunable pulse width. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 A schematic diagram of the structure of a laser provided in some embodiments of the present application; Figure 2 A schematic diagram of the structure of a pulse width compression module provided in some other embodiments of the present application; Figure 3 A schematic diagram of the structure of a pulse width compression module provided in some other embodiments of the present application; Figure 4 A schematic diagram of the control process of a pulse width compression module provided in some other embodiments of the present application.

[0013] Description of reference numerals: A seed light source 14, a first plane mirror 13, a first 1 / 2 wave plate 12, a first polarization beam splitter 11, a Faraday rotator 10, a second 1 / 2 wave plate 9, a second polarization beam splitter 7, a first Pockels cell 2, a 1 / 4 wave plate 3, a second plane mirror 4, a concave mirror 5, a spherical mirror 8, a third plane mirror 6, a disk module 21, a third polarization beam splitter 15, a third 1 / 2 wave plate 22, a first electrically-controlled transversely movable plane mirror 19, a second electrically-controlled transversely movable plane mirror 18, a nonlinear crystal 17, a fourth plane mirror 16, a second Pockels cell 20, and a pump source 1. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0015] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0016] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0017] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these should not be limited to these terms. These terms are only used to distinguish. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0018] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or device. In the absence of more restrictions, the elements defined by the sentence "comprises a" do not exclude the presence of other identical elements in the product or device including the elements.

[0019] The size of the laser pulse width directly affects the energy density and peak power of the laser pulse, and thus affects the effect of the interaction between the laser and matter. Chirped pulse amplification (CPA) can be applied to ultrashort pulse lasers. The ultrashort light pulse is first widened in the time domain, then amplified to high energy, and finally the pulse width is compressed back. This method effectively reduces the peak power of the pulse in the amplifier and gets rid of the limitation of nonlinear effects. Ultrashort pulses with high peak power can be obtained from this laser system.

[0020] The present invention adopts a nonlinear crystal multi-pass compression method to solve the problem of high-power laser pulse width compression. The nonlinear crystal in the ring cavity is used to make different spectral components experience different optical paths, and the optical path experienced by the long wavelength is greater than that of the short wavelength. The negative dispersion compensation positive chirp conjugated with the stretcher is introduced to achieve pulse compression. At the same time, the 1 / 2 wave plate and / or the Pockels cell in the ring cavity realizes the modulation of the light beam through the electro-optical effect, which can block the transmission of the light beam under specific conditions, realize the fast switching or Q switching function of the light beam, and thus realize the generation of high-energy pulses or precise control of optical signals in the laser system. The output pulse width can be changed by adjusting the electrical pulse width and delay of the Pockels cell, controlling the number of cycles of light in the ring cavity, and then controlling the number of turns through the ring cavity. Because different numbers of turns can change the dispersion amount differently, by adjusting the falling edge voltage of the Pockels cell, the laser pulse width gradually narrows, and the polarization state changes, a high-power pulse laser with tunable pulse width can be output. Or a 1 / 2 wave plate can be directly added to output a pulse train laser by rotating the angle.

[0021] The present application is described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the present application provides a high-power pulse width repetition rate tunable disk laser, including an input and output optical path, a regenerative amplifier optical path and a pulse width compression module, the input and output optical path is configured to input seed light and output amplified laser, and the input and output optical path includes: a seed light source 14, a first plane reflector 13, a first 1 / 2 wave plate 12, a first polarization beam splitter 11, a Faraday rotator 10 and a second 1 / 2 wave plate 9.

[0023] The regenerative amplifier optical path is configured to amplify the input seed light, and the regenerative amplifier optical path includes: a second polarization beam splitter 7, a first Pockels cell 2, a quarter wave plate 3, a second plane reflector 4, a concave reflector 5, a spherical reflector 8, a third plane reflector 6 and a disk module 21.

[0024] The pulse width compression module is configured to compress the pulse width of the amplified seed light and output a high-power pulse laser with tunable pulse width. The pulse width compression module includes: a third polarization beam splitter 15, a third 1 / 2 wave plate 22, a first electrically-controlled transversely movable plane mirror 19, a second electrically-controlled transversely movable plane mirror 18, a nonlinear crystal 17 and a fourth plane mirror 16.

[0025] The seed light source outputs a broadened ns-level s-polarized seed light, which is converted into a p-polarized seed light through the first plane reflector 13 and the first 1 / 2 wave plate 12, and then enters the regenerative amplifier optical path through the first polarization beam splitter 11, the Faraday rotator 10 and the second 1 / 2 wave plate 9; the seed source is a ps-level pulse laser generated by a fiber mode-locked oscillator, which is widened to the ns level through the fiber widener, and then outputs an s-polarized seed light that matches the amplifier cavity after widening, and injects it into the regenerative amplifier optical path constructed by the disc module. The Faraday rotator 10 uses the non-reciprocal properties of magneto-optical materials to change the phase of the incident laser, and together with the second 1 / 2 wave plate 9, can effectively prevent the backlight generated by reflection or backscattering in the optical path from having an adverse effect on the light source.

[0026] In some embodiments, the seed light source 16 can be a fiber laser, and the laser emitted by the fiber laser is the seed light to be amplified. The picosecond light generated by the fiber laser is amplified and broadened, and then frequency selected by an acousto-optic modulator, and the repetition frequency range is 10Hz-100MHz. The seed light in the s-polarization state undergoes beam transformation, so that the light spot entering the disc regeneration amplifier resonant cavity matches the cavity type characteristics of the resonant cavity. The seed light in the s-polarization state after beam transformation is converted into a p-polarization state after passing through the 45-degree first plane reflector 13 and the first 1 / 2 wave plate 12. The seed light in the p-polarization state passes through the first polarization beam splitter 11 and still maintains the p-polarization state through the Faraday rotator 10 and the second 1 / 2 wave plate 9, and then is coupled into the disc regeneration amplifier resonant cavity through the second polarization beam splitter 7. The p-polarized seed light entering the resonant cavity of the disk regenerative amplifier passes through the first Pockels cell 2 without voltage, the quarter wave plate 3, the 45-degree second plane reflector 4, and the concave reflector 5 in sequence. After being reflected by the concave reflector 5, it returns to the original path and passes through the 45-degree second plane reflector 4 and the quarter wave plate 3 in sequence, and then changes to the s-polarized state. The s-polarized seed light passes through the first Pockels cell 2 without voltage, is reflected by the second polarization beam splitter 7, and then passes through the spherical reflector 8 and the third plane reflector 6 in sequence to reach the intracavity gain medium disk module 21. The seed light energy is amplified and is reflected by the disk module 21 and then returns to the original path. In this process, the s-polarized seed light passes through the quarter wave plate 3 and the first Pockels cell 2 that is kept in working state by applying a quarter wave voltage twice, and the polarization state remains unchanged. Therefore, after being reflected by the second polarization beam splitter 7, it oscillates back and forth in the resonant cavity, and passes through the disk module 21 many times to obtain gain for energy amplification. When the energy of the seed light is amplified to the target value, the quarter-wave voltage applied to the first Pockels cell 2 is canceled to keep it in an inoperative state. The s-polarized seed light amplified in the cavity passes through the 1 / 4 wave plate 3 and the first Pockels cell 2 without electricity twice and becomes a p-polarized state. The p-polarized amplified light is coupled out through the second polarization beam splitter 7, and then passes through the second 1 / 2 wave plate 9 and the Faraday rotator 10 and becomes an s-polarized state. It passes through the first polarization beam splitter 11 and is reflected and output to the pulse width compression module.

[0027] The round trip time of the seed light in the resonant cavity is controlled by controlling the working state and working time of the first Pockels cell 2, and the seed light energy is amplified to the target value and then output from the polarization beam splitter 11. Among them, the second plane reflector 4 is a total reflection of the laser incident at 45 degrees, folds the optical path of the resonant cavity and facilitates the adjustment of the optical path. The concave reflector 5 is used to reduce the divergence angle of the incident laser and fully reflect the laser incident at 0 degrees. The second polarization beam splitter 7 of 45 degrees is used to have high transmittance for lasers in the p-polarization state and high reflection for lasers in the s-polarization state, and the angle between the incident light and the normal line of the lens is 45 degrees. The 1 / 4 wave plate 3 is used to change the phase of the seed light, convert linear polarized light into circular polarized light, and convert circular polarization into linear polarization. The function of the first Pockels cell 2 is that when a voltage is applied, the first Pockels cell is equivalent to a 1 / 4 wave plate, that is, the phase change after the laser passes through is 45 degrees. The second plane reflector 4 is a total reflection of the laser incident at 45 degrees, folds the optical path of the resonant cavity and facilitates the adjustment of the optical path.

[0028] like Figure 2 As shown, the laser input into the pulse width compression module is cyclically compressed by the pulse width compression module, and the polarization direction of the linear polarized light can be rotated by rotating the angle of the third 1 / 2 wave plate 22, and the dispersion amount of the nonlinear crystal 17 is controlled to control the compression amount. The pulse width can be compressed once after each circle, thereby outputting a pulse train with tunable pulse width. In some embodiments, the pulse width of the pulse train is a ps-level pulse.

[0029] In some embodiments, Figure 3 As shown, the pulse width compression module also includes a second Pockels cell 20, which is disposed between the third polarization beam splitter 15 and the third 1 / 2 wave plate 22. The laser input into the pulse width compression module passes through the third polarization beam splitter 15, so that the light enters the pulse compression module. By adjusting the falling edge voltage of the second Pockels cell 20 in the annular cavity, the pulse width is gradually reduced while the polarization state is changed, and a high-power pulse laser string with tunable pulse width can be output. In some embodiments, a control module is also included, and the control module is used to adjust the falling edge voltage of the second Pockels cell 20. Figure 3 As shown, the laser is in the off-voltage state when passing through the second Pockels cell 20 for the first time, and the optical axis direction of the third 1 / 2 wave plate 22 forms an angle of 45° with the polarization direction of the incident light. The polarization changes after passing through the third 1 / 2 wave plate 22, and then the Pockels cell is pressurized, and the light is compressed in the annular cavity all the time, which can further improve the compression ratio. By adjusting the falling edge voltage of the Pockels cell in the annular cavity, the voltage drops slowly, and the pulse width gradually decreases. At the same time, by changing the polarization state, a high-power pulse laser with tunable pulse width can be output. The Pockels cell can be used to maintain a stable output power, thereby obtaining a pulse train with tunable pulse width and consistent power, which has a higher degree of compression than the previous solution.

[0030] In some embodiments, Figure 4 As shown, the optical path is folded by the first electrically controlled transversely movable plane mirror 19 and the second electrically controlled transversely movable plane mirror 18, and the control module controls the first electrically controlled transversely movable plane mirror 19 and the second electrically controlled transversely movable plane mirror 18 to move transversely to adjust the pulse compression path in the annular cavity and thus change the pulse period size, that is, change the repetition frequency size, and finally obtain a high-power pulse width repetition frequency tunable pulse train by electrically controlling the transversely movable plane mirror. By introducing a nonlinear crystal 17, such as a barium borate (BBO) crystal, into the annular cavity, different spectral components experience different optical paths, wherein the optical path experienced by the long wavelength component is greater than that of the short wavelength component. The pulse width compression module introduces negative dispersion conjugated with the stretcher, thereby compensating for positive chirp and achieving effective compression of the pulse.

[0031] In some embodiments, the entire pulse width compression module is built into a monolithic aluminum housing with high thermal and mechanical stability. The multi-pass compression structure based on nonlinear crystals recompresses the output pulse to a pulse with a duration of ps, and the output beam has excellent beam quality and uniformity.

[0032] In some embodiments, the regenerative amplifier optical path further includes a pump source 1 for outputting pump light to pump the disc module 21. The pump source 1 provides energy to the laser medium to achieve population inversion, thereby generating laser light. In some embodiments, the pump source 1 is, for example, a semiconductor laser, which outputs pump light with a laser center wavelength of 969 nm or 940 nm, and the pump light output by the pump source 1 pumps the disc module 21; wherein, in order to make the laser output by the disc regenerative amplifier have good beam quality, the laser spot size at the disc needs to meet certain mode matching requirements with the pump spot size, that is, the laser spot size should be 0.7-0.8 times the pump spot size, so as to achieve laser output of the fundamental transverse mode.

[0033] In some embodiments, the first Pockels cell 15 is controlled by an electric pulse generated by a digital delay signal generator to control whether it works or not, and by controlling the delay and width of the electric pulse, it controls the output of the seed light and the number of round trips in the cavity together with the second polarization beam splitter 10. The disk laser crystal 8 includes at least one of the following: Yb:YAG, Yb:KGW, Yb:CALGO, Yb:LuScO3, Ho:YAG, Ho:KYW, Tm:YAG, Tm:KYW, Cr:ZnSe and Tm:LLF; the diameter of the disk laser crystal 8 is 5-50mm, for example, a Yb:YAG disk laser crystal, with a thickness of hundreds of microns, a diameter of 5-50mm, a doping concentration of 0.3-10%, and a front surface of the disk is coated with an anti-reflection film for the pump light wavelength and the seed light wavelength, and a rear surface is coated with a high reflection film for the pump light wavelength and the seed light wavelength.

[0034] In some embodiments, the minimum diameter of the light spot of the amplified light path in the disc regeneration amplifier cavity is 2 mm-2.1 mm.

[0035] The present invention proposes a new type of laser with adjustable output pulse width and repetition rate, and can realize pulse train laser output. Based on the nonlinear crystal multi-pass compression method, the present invention builds a high-power disk laser, which contains a nonlinear crystal and a 1 / 2 wave plate or a ring cavity with a Pockels cell for pulse width compression, and finally obtains a high-power pulse train with tunable pulse width.

[0036] The present invention realizes effective compression of pulses by introducing nonlinear crystals in the annular cavity. The high-power laser can obtain a larger compression factor by running multiple passes in the annular cavity, and outputs a high-power pulse laser with tunable pulse width by adjusting the Pockels cell or 1 / 2 wave plate in the annular cavity. The optical path is folded through two electrically controlled transversely movable plane mirrors, and the pulse compression path in the annular cavity is adjusted by transverse movement to change the pulse period size. The present application is simple to operate and low in cost, and opens up more directions for ultrafast optics to achieve higher power and higher energy pulse compression.

[0037] Finally, it should be noted that: each embodiment in this specification is described by way of example, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0038] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-power pulse width repetition rate tunable laser, characterized in that ,include: An input and output optical path configured to input seed light and output amplified laser light, the input and output optical path comprising: a seed light source (14), a first plane reflector (13), a first 1 / 2 wave plate (12), a first polarization beam splitter (11), a Faraday rotator (10) and a second 1 / 2 wave plate (9); A regenerative amplifier optical path, configured to amplify input seed light, the regenerative amplifier optical path comprising: a second polarization beam splitter (7), a first Pockels cell (2), a quarter wave plate (3), a second plane reflector (4), a concave reflector (5), a spherical reflector (8), a third plane reflector (6), and a disk module (21); A pulse width compression module is configured to compress the pulse width of the amplified seed light and output a high-power pulse laser with tunable pulse width, the pulse width compression module comprising: a third polarization beam splitter (15), a third 1 / 2 wave plate (22), a first electrically controlled transversely movable plane reflector (19), a second electrically controlled transversely movable plane reflector (18), a nonlinear crystal (17) and a fourth plane reflector (16); The seed light source outputs broadened ns-level s-polarized seed light, and the seed light passes through a first plane reflector (13) and a first 1 / 2 wave plate (12), and the s-polarized seed light is converted into p-polarized seed light, and then passes through a first polarization beam splitter (11), a Faraday rotator (10) and a second 1 / 2 wave plate (9) to enter the regenerative amplifier optical path; The seed light entering the optical path of the regenerative amplifier passes through the first Pockels cell (2), the quarter wave plate (3), the second plane reflector (4), and the concave reflector (5); after being reflected by the concave reflector (5), it returns along the original path and passes through the second plane reflector (4), the quarter wave plate (3), the first Pockels cell (2), the second polarization beam splitter (7), the spherical reflector (8), and the third plane reflector (6) in sequence before reaching the disk module (21); after being amplified by the disk module (21), it returns along the original path and is amplified back and forth in the resonant cavity; the amplified seed light is output from the first polarization beam splitter (11) to the first Pockels cell of the pulse width compression module; The laser is circulated and compressed in the pulse width compression module. The polarization direction of the linearly polarized light can be rotated by rotating the angle of the third 1 / 2 wave plate (22). The dispersion amount of the nonlinear crystal (17) is controlled to control the compression amount. The pulse width can be compressed once after each circle, thereby outputting a pulse train with tunable pulse width.

2. The laser according to claim 1, characterized in that The pulse width compression module further comprises: a second Pockels cell (20) disposed between the third polarization beam splitter (15) and the third 1 / 2 wave plate (22).

3. The laser according to claim 1, characterized in that The repetition frequency of the pulse train is adjusted by adjusting the first electrically-controlled transversely movable plane reflector (19) and the second electrically-controlled transversely movable plane reflector (18).

4. The laser according to claim 1, characterized in that , the regenerative amplifier optical path also includes: A pump source (1) is used to output pump light to pump the disk module (21).

5. The laser according to claim 1, characterized in that , the disc module includes at least one of the following: Yb:YAG, Yb:KGW, Yb:LuScO3, Yb:CALGO, Ho:YAG, Ho:KYW, Tm:YAG, Tm:KYW, Cr:ZnSe and Tm:LLF.

6. The laser according to claim 2, characterized in that , also includes: The control module adjusts the falling edge voltage of the second Pockels cell (20) so that the pulse width of the pulse train gradually decreases while changing the polarization state, thereby outputting a high-power pulse train with tunable pulse width.

7. The laser according to claim 1, characterized in that , the pulse width of the pulse train is a ps level pulse.

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