Device for improving turn-off capability of high-power green laser

Abstract

The invention discloses a device for improving the turn-off capability of a high-power green laser. Comprising a first output mirror, a frequency doubling crystal, a harmonic reflector, a first laser module, a 90-degree rotator, a second laser module, a first beam splitter, a 45-degree total reflective mirror, a first acousto-optic Q switch, a second acousto-optic Q switch, a third acousto-optic Q switch, a first total reflective mirror, a second total reflective mirror and a third total reflective mirror. The gain of the split light beam is reduced compared with the gain of the main optical axis light beam through light splitting, so that the turn-off capability of the acousto-optic Q-switch is improved. According to the invention, the laser output peak power is improved, and the Q-switched laser can be used in a high-power Q-switched laser requiring high turn-off capability.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state lasers, and in particular to a device for improving the shutoff capability of a high-power green laser. Background Art

[0002] In recent years, the application of lasers has become increasingly widespread, and the advancement of laser technology has provided strong support for technological development and innovation in many fields. At the same time, the demand for high-power green lasers has also increased. Existing technologies for generating quasi-continuous-wave (QCW) high-peak-power green lasers primarily utilize acousto-optic modulation of the quality factor (Q value) of the resonant cavity to increase the peak power density of the laser pulse, thereby improving the frequency doubling efficiency.

[0003] Current acousto-optic Q-switching technologies typically have limited shutoff capabilities. Typically, the diffraction loss of an acousto-optic Q-switch is between 80% and 90%. To increase diffraction loss, two Q-switches are often used in sync to improve shutoff capability. However, in high-power lasers, the small-signal gain of the laser gain medium is often very large, sometimes as high as dozens of times. Even using two Q-switches in combination cannot effectively shut off the laser, severely hindering the development of higher-power lasers.

[0004] Therefore, in order to obtain high peak power and stable laser output, a new device with improved shutdown capability of high-power green laser is needed to address the shortcomings of current technology. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for improving the shutdown capability of a high-power green laser, so that when the power density and gain in the resonant cavity are high, the normal shutdown capability can still be maintained, so that the output peak power of the laser remains stable.

[0006] In a first aspect, the present invention provides a device for improving the shutdown capability of a high-power green laser, comprising: a first output mirror, a frequency doubling crystal, a harmonic reflector, a first laser module, a 90° optical rotator, a second laser module, a first beam splitter, a 45° total reflector, a first acousto-optic Q-switch, a second acousto-optic Q-switch, a third acousto-optic Q-switch, a first total reflector, a second total reflector, and a third total reflector;

[0007] The first output mirror, the frequency doubling crystal, the harmonic reflector, the first laser module, the 90° optical rotator, the second laser module, the first beam splitter, the second acousto-optic Q-switch, and the second total reflector are arranged in sequence along the principal optical axis; the planes of the first output mirror and the harmonic reflector are both perpendicular to the principal optical axis, and the plane of the 90° optical rotator is perpendicular to the principal optical axis; the first beam splitter is coated with a 1064 nm partially transparent film, the first beam splitter is at a 45° angle to the principal optical axis, and the plane of the 45° total reflector is parallel to the first beam splitter;

[0008] The first acousto-optic Q-switch and the third total reflector are sequentially arranged in the reflection direction of the split light of the 45° total reflector; the third acousto-optic Q-switch and the first total reflector are sequentially arranged in the reflection direction of the split light of the first beam splitter; the planes where the first total reflector, the second total reflector and the third total reflector are located are respectively perpendicular to the optical axes of their split light.

[0009] In the second aspect, based on the first aspect, it also includes: a second beam splitter, a fourth acousto-optic Q-switch and a fourth total reflection mirror; the second beam splitter is located between the second laser module and the first beam splitter, the plane of the second beam splitter is 45° to the main optical axis and is parallel to the plane of the first beam splitter, and the fourth acousto-optic Q-switch and the fourth total reflection mirror are arranged in sequence in the splitting light path of the second beam splitter.

[0010] In a third aspect, the present invention provides a device for improving the shutdown capability of a high-power green laser, comprising: a frequency doubling crystal, a first laser module, a 90° optical rotator, a second laser module, a first beam splitter, a 45° total reflective mirror, a first acousto-optic Q-switch, a second acousto-optic Q-switch, a third acousto-optic Q-switch, a first total reflective mirror, a second total reflective mirror, a third total reflective mirror, and a second output mirror;

[0011] The frequency doubling crystal, the second output mirror, the first laser module, the 90° optical rotator, the second laser module, the first beam splitter, the second acousto-optic Q-switch, and the second total reflector are arranged in sequence along the principal optical axis; the second output mirror is coated with a 1064nm anti-reflection coating, the plane of the second output mirror is perpendicular to the principal optical axis, and the plane of the 90° optical rotator is perpendicular to the principal optical axis; the first beam splitter is at a 45° angle to the principal optical axis, and the plane of the 45° total reflector is parallel to the first beam splitter;

[0012] The first acousto-optic Q-switch and the third total reflector are sequentially arranged in the reflection direction of the split light of the 45° total reflector; the third acousto-optic Q-switch and the first total reflector are sequentially arranged in the reflection direction of the split light of the first beam splitter; the planes where the first total reflector, the second total reflector and the third total reflector are located are respectively perpendicular to the optical axes of their split light.

[0013] In a fourth aspect, the present invention provides a device for improving the shutdown capability of a high-power green laser, comprising: a frequency doubling crystal, a first laser module, a 90° optical rotator, a second laser module, a first beam splitter, a 45° total reflective mirror, a first acousto-optic Q-switch, a second acousto-optic Q-switch, a third acousto-optic Q-switch, a first total reflective mirror, a second total reflective mirror, a third total reflective mirror, a fifth total reflective mirror, a third output mirror, and a sixth total reflective mirror;

[0014] The fifth total reflection mirror, the first laser module, the 90° optical rotator, the second laser module, the first beam splitter, the second acousto-optic Q switch, and the second total reflection mirror are arranged in sequence along the main optical axis; the sixth total reflection mirror, the doubled frequency crystal, and the third output mirror are arranged in sequence parallel to the main optical axis; the fifth total reflection mirror is a 1064nm total reflection mirror, the surface of the third output mirror is coated with a 1064nm total reflection and a 532nm high-transmittance film, and the sixth total reflection mirror is a 1064nm and 532nm total reflection mirror; the angle between the fifth total reflection mirror and the third output mirror is such that the main optical axis after reflection remains parallel to the original optical axis;

[0015] The plane where the 90° optical rotator is located is perpendicular to the principal optical axis; the first beam splitter is coated with a 1064nm partially transparent film, the first beam splitter is at a 45° angle to the principal optical axis, and the plane where the 45° total reflector is located is parallel to the first beam splitter;

[0016] The first acousto-optic Q-switch and the third total reflector are sequentially arranged in the reflection direction of the split light of the 45° total reflector; the third acousto-optic Q-switch and the first total reflector are sequentially arranged in the reflection direction of the split light of the first beam splitter; the planes where the first total reflector, the second total reflector and the third total reflector are located are respectively perpendicular to the optical axes of their split light.

[0017] In a fifth aspect, the present invention provides a device for improving the shutdown capability of a high-power green laser, comprising: a first output mirror, a frequency doubling crystal, a harmonic reflector, a second laser module, a first beam splitter, a 45° total reflector, a first acousto-optic Q-switch, a second acousto-optic Q-switch, a third acousto-optic Q-switch, a first total reflector, a second total reflector, and a third total reflector;

[0018] The first output mirror, the frequency doubling crystal, the harmonic reflector, the second laser module, the first beam splitter, the second acousto-optic Q-switch, and the second total reflector are arranged in sequence along the principal optical axis; the planes of the first output mirror and the harmonic reflector are both perpendicular to the principal optical axis; the first beam splitter is coated with a 1064 nm partially transparent film; the first beam splitter is at a 45° angle to the principal optical axis; and the plane of the 45° total reflector is parallel to the first beam splitter;

[0019] The first acousto-optic Q-switch and the third total reflector are sequentially arranged in the reflection direction of the split light of the 45° total reflector; the third acousto-optic Q-switch and the first total reflector are sequentially arranged in the reflection direction of the split light of the first beam splitter; the planes where the first total reflector, the second total reflector and the third total reflector are located are respectively perpendicular to the optical axes of their split light.

[0020] The present invention has the following beneficial effects: A device for improving the shutdown capability of a high-power green laser is simple and convenient, easy to install and debug, and readily applicable for engineering applications. It can reduce the gain of the split beam within the resonant cavity by splitting the light, thereby enhancing the shutdown capability of the acousto-optic Q-switched switch and thus improving the laser output peak power. The present invention is suitable for use in high-power Q-switched lasers requiring high shutdown capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a structural diagram of a first embodiment of a device for improving the shutoff capability of a high-power green laser according to the present invention;

[0023] Figure 2 This is a structural diagram of a second embodiment of a device for improving the shutoff capability of a high-power green laser according to the present invention;

[0024] Figure 3 This is a structural diagram of a third embodiment of a device for improving the shutoff capability of a high-power green laser according to the present invention;

[0025] Figure 4 This is a structural diagram of a fourth embodiment of a device for improving the shutoff capability of a high-power green laser according to the present invention;

[0026] Figure 5 This is a structural diagram of a fifth embodiment of a device for improving the shutdown capability of a high-power green laser according to the present invention.

[0027] Illustration: 1-first output mirror; 2-doubled frequency crystal; 3-harmonic reflector; 4-first laser module; 5-90° optical rotator; 6-second laser module; 7-first beam splitter; 8-45° total reflection mirror; 9-first acousto-optic Q-switch; 10-second acousto-optic Q-switch; 11-third acousto-optic Q-switch; 12-first total reflection mirror; 13-second total reflection mirror; 14-third total reflection mirror; 15-second beam splitter; 16-fourth acousto-optic Q-switch; 17-fourth total reflection mirror; 18-second output mirror; 19-fifth total reflection mirror; 20-third output mirror; 21-sixth total reflection mirror. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. The technical solutions provided by each embodiment of the present invention are described in detail below in conjunction with the drawings.

[0029] Example 1

[0030] like Figure 1 As shown, a device for improving the shutdown capability of a high-power green laser provided in Embodiment 1 of the present invention includes: a first output mirror 1, a frequency doubling crystal 2, a harmonic reflector 3, a first laser module 4, a 90° optical rotator 5, a second laser module 6, a first beam splitter 7, a 45° total reflector 8, a first acousto-optic Q-switch 9, a second acousto-optic Q-switch 10, a third acousto-optic Q-switch 11, a first total reflector 12, a second total reflector 13, and a third total reflector 14.

[0031] Specifically, the first output mirror 1 has high reflection for 1064nm fundamental frequency light and high transmission for 532nm double frequency light; the double frequency crystal 2 is used to generate double frequency laser; the harmonic reflector 3 has high transmission for fundamental frequency light and high reflection for double frequency light.

[0032] The first output mirror 1, the frequency doubling crystal 2, the harmonic reflector 3, the first laser module 4, the 90° optical rotator 5, the second laser module 6, the first beam splitter 7, the second acousto-optic Q-switch 10, and the second total reflection mirror 13 are arranged in sequence along the principal optical axis. The planes of the first output mirror 1 and the harmonic reflector 3 are both perpendicular to the principal optical axis, and the plane of the 90° optical rotator 5 is perpendicular to the principal optical axis. The first beam splitter 7 is coated with a 1064 nm partially transparent film, and the first beam splitter 7 is at 45° to the principal optical axis. The plane of the 45° total reflection mirror 8 is parallel to the first beam splitter 7. The 45° total reflector 8 is placed in the optical path of the split light and is used to reflect the split light to the first acousto-optic Q-switch 9. The first acousto-optic Q-switch 9 and the third total reflector 14 are arranged in sequence in the reflection direction of the split light of the 45° total reflector 8. The third acousto-optic Q-switch 11 and the first total reflector 12 are arranged in sequence in the reflection direction of the split light of the first beam splitter 7. The planes on which the first total reflector 12, the second total reflector 13 and the third total reflector 14 are located are respectively perpendicular to the optical axes of the split light, thereby maximizing the reflectivity of the split light.

[0033] The light output centers of the first laser module 4 and the second laser module 6 are parallel to the main optical axis, so that a high-quality 1064nm fundamental frequency light beam is generated in the resonant cavity. The first beam splitter 7 is coated with a 1064nm partially transparent film. Therefore, the light beam in the resonant cavity is first split into two beams by the first beam splitter 7. One beam continues to propagate along the main optical axis to the second total reflection mirror 13, and the resonant cavity formed between the second total reflection mirror 13 and the first output mirror 1 is resonant cavity 1; the other beam propagates along the reflection direction of the beam splitter to the third total reflection mirror 14, and the resonant cavity formed between the third total reflection mirror 14 and the first output mirror 1 is resonant cavity 2; the light beam in resonant cavity 1 is folded back along the original optical path through the second total reflection mirror 13. When the laser gain in the resonant cavity is too large and the second acousto-optic Q-switch 10 cannot be completely turned off, it is reflected by the first beam splitter 7 again, passes through the third acousto-optic Q-switch 11, and further propagates to the first total reflection mirror 12. Through the above-mentioned spectroscopic method, the azimuth and pitch of the acousto-optic Q switches in resonant cavity one and resonant cavity two are further fine-tuned until the acousto-optic Q switches completely shut off the light beam in the cavity. On this basis, the azimuth and pitch of the frequency-doubling crystal are fine-tuned to maximize the total power of the frequency-doubling light output.

[0034] This embodiment has a simple structure, low cost, convenient operation, reliability, and is conducive to engineering promotion. It can largely meet the requirements of scientific research, medical treatment, crystal testing, laser processing and other fields for high-power green laser shutdown capability and maintain the stability of output peak power.

[0035] Example 2

[0036] like Figure 2 As shown, a device for improving the shutdown capability of a high-power green laser provided in Example 2 of the present invention, based on Example 1, further includes: a second beam splitter 15, a fourth acousto-optic Q-switch 16, and a fourth total reflector 17. The second beam splitter 15 is located between the second laser module 6 and the first beam splitter 7. The plane of the second beam splitter 15 is at a 45° angle to the main optical axis and is parallel to the plane of the first beam splitter 7. The fourth acousto-optic Q-switch 16 and the fourth total reflector 17 are arranged in sequence in the splitting optical path of the second beam splitter 15.

[0037] In the second embodiment, the second beam splitter 15 is inserted into the main optical axis, and the plane of the second beam splitter 15 is at 45 degrees to the main optical axis, that is, parallel to the plane of the first beam splitter 7. Therefore, the fundamental frequency light in the cavity is split again before propagating to the first beam splitter 7, increasing the number of split beams, so that the gain in the resonant cavity is further reduced, and the fourth acousto-optic Q switch 16 and the fourth total reflector 17 are placed in the splitting optical path of the second beam splitter 15 in sequence, and then the remaining parts are placed in the same way as in the first embodiment to achieve further splitting, thereby improving the shutdown capability.

[0038] Example 3

[0039] like Figure 3As shown, a device for improving the shutdown capability of a high-power green laser provided by Embodiment 3 of the present invention includes: a frequency doubling crystal 2, a first laser module 4, a 90° optical rotator 5, a second laser module 6, a first beam splitter 7, a 45° total reflective mirror 8, a first acousto-optic Q-switch 9, a second acousto-optic Q-switch 10, a third acousto-optic Q-switch 11, a first total reflective mirror 12, a second total reflective mirror 13, a third total reflective mirror 14, and a second output mirror 18.

[0040] The frequency doubling crystal 2, the second output mirror 18, the first laser module 4, the 90° optical rotator 5, the second laser module 6, the first beam splitter 7, the second acousto-optic Q-switch 10, and the second total reflector 13 are arranged in sequence along the principal optical axis. The second output mirror 18 is coated with a 1064nm anti-reflection coating. The plane of the second output mirror 18 is perpendicular to the principal optical axis, and the plane of the 90° optical rotator 5 is perpendicular to the principal optical axis. The first beam splitter 7 is at a 45° angle to the principal optical axis, and the plane of the 45° total reflector 8 is parallel to the first beam splitter 7.

[0041] The first acousto-optic Q-switch 9 and the third total reflector 14 are sequentially arranged in the reflection direction of the split light of the 45° total reflector 8; the third acousto-optic Q-switch 11 and the first total reflector 12 are sequentially arranged in the reflection direction of the split light of the first beam splitter 7; the planes on which the first total reflector 12, the second total reflector 13 and the third total reflector 14 are located are respectively perpendicular to the optical axes of their split light.

[0042] In the third embodiment of the present invention, based on the first embodiment, the first output mirror 1 is removed and the harmonic reflector 3 is replaced by a second output mirror 18 coated with a 1064nm anti-reflection film. The plane of the second output mirror 18 is perpendicular to the main optical axis. The remaining parts are placed in the same manner as in the first embodiment, thereby adjusting the intracavity frequency doubling to the extracavity frequency doubling to achieve the purpose of splitting frequency doubling output.

[0043] Example 4

[0044] like Figure 4 As shown, a device for improving the shutdown capability of a high-power green laser provided by a fourth embodiment of the present invention includes: a frequency doubling crystal 2, a first laser module 4, a 90° optical rotator 5, a second laser module 6, a first beam splitter 7, a 45° total reflection mirror 8, a first acousto-optic Q-switch 9, a second acousto-optic Q-switch 10, a third acousto-optic Q-switch 11, a first total reflection mirror 12, a second total reflection mirror 13, a third total reflection mirror 14, a fifth total reflection mirror 19, a third output mirror 20, and a sixth total reflection mirror 21.

[0045] The fifth total reflection mirror 19, the first laser module 4, the 90° optical rotator 5, the second laser module 6, the first beam splitter 7, the second acousto-optic Q-switch 10, and the second total reflection mirror 13 are arranged in sequence along the principal optical axis; the sixth total reflection mirror 21, the doubled frequency crystal 2, and the third output mirror 20 are arranged in sequence parallel to the principal optical axis; the fifth total reflection mirror 19 is a 1064nm total reflection mirror, the third output mirror 20 is coated with a 1064nm total reflection and a 532nm high-transmittance film, and the sixth total reflection mirror 21 is a 1064nm and 532nm total reflection mirror; the angle between the fifth total reflection mirror 19 and the third output mirror 20 is such that the principal optical axis after reflection remains parallel to the original optical axis.

[0046] The plane of the 90° optical rotator 5 is perpendicular to the principal optical axis. The first beam splitter 7 is coated with a 1064 nm partially transparent film and is oriented at a 45° angle to the principal optical axis. The plane of the 45° total reflector 8 is parallel to the first beam splitter 7. The first acousto-optic Q-switch 9 and the third total reflector 14 are sequentially arranged in the direction of reflection of the split light from the 45° total reflector 8. The third acousto-optic Q-switch 11 and the first total reflector 12 are sequentially arranged in the direction of reflection of the split light from the first beam splitter 7. The planes of the first total reflector 12, the second total reflector 13, and the third total reflector 14 are respectively perpendicular to the optical axes of the split light.

[0047] In the fourth embodiment of the present invention, the harmonic reflector 3 in the first embodiment is replaced with a fifth total reflector 19 with a wavelength of 1064 nm, the first output mirror 1 is replaced with a sixth total reflector 21 with wavelengths of 1064 nm and 532 nm, and a third output mirror 20 is placed between the fifth total reflector 19 and the doubler 2. The surface of the third output mirror 20 is coated with a 1064 nm total reflector and a 532 nm high-transmittance film. The angle between the fifth total reflector 19 and the third output mirror 20 is adjusted so that the main optical axis after reflection remains parallel to the original optical axis. The remaining components are arranged as in the first embodiment, and a folded cavity and a split-beam shutoff method are used to achieve higher power and higher beam quality laser output.

[0048] Example 5

[0049] like Figure 5 As shown, a device for improving the shutdown capability of a high-power green laser provided by Embodiment 5 of the present invention includes: a first output mirror 1, a frequency doubling crystal 2, a harmonic reflector 3, a second laser module 6, a first beam splitter 7, a 45° total reflector 8, a first acousto-optic Q-switch 9, a second acousto-optic Q-switch 10, a third acousto-optic Q-switch 11, a first total reflector 12, a second total reflector 13, and a third total reflector 14.

[0050] The first output mirror 1, the frequency doubling crystal 2, the harmonic reflector 3, the second laser module 6, the first beam splitter 7, the second acousto-optic Q-switch 10 and the second total reflector 13 are arranged in sequence along the main optical axis; the planes of the first output mirror 1 and the harmonic reflector 3 are both perpendicular to the main optical axis, the first beam splitter 7 is coated with a 1064nm partially transparent film, the first beam splitter 7 is at 45° to the main optical axis, and the plane of the 45° total reflector 8 is parallel to the first beam splitter 7.

[0051] The first acousto-optic Q-switch 9 and the third total reflector 14 are sequentially arranged in the reflection direction of the split light of the 45° total reflector 8; the third acousto-optic Q-switch 11 and the first total reflector 12 are sequentially arranged in the reflection direction of the split light of the first beam splitter 7; the planes on which the first total reflector 12, the second total reflector 13 and the third total reflector 14 are located are respectively perpendicular to the optical axes of their split light.

[0052] In the fifth embodiment of the present invention, the first laser module 4 and the 90° optical rotator 5 in the first embodiment are removed, so that the dual-module resonant cavity is adjusted to a single-module resonant cavity. The remaining parts are placed as shown in the first embodiment. Since the intracavity gain of the single-module resonant cavity is smaller, the ability of splitting and shutting off is relatively enhanced.

[0053] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and are intended to be encompassed by the claims of the present invention.

Claims

1. A device for improving the shutoff capability of a high-power green laser, characterized in that: include: A first output mirror (1), a frequency doubling crystal (2), a harmonic reflector (3), a first laser module (4), a 90° optical rotator (5), a second laser module (6), a first beam splitter (7), a 45° total reflector (8), a first acousto-optic Q-switch (9), a second acousto-optic Q-switch (10), a third acousto-optic Q-switch (11), a first total reflector (12), a second total reflector (13), and a third total reflector (14); The first output mirror (1), the frequency doubling crystal (2), the harmonic reflector (3), the first laser module (4), the 90° optical rotator (5), the second laser module (6), the first beam splitter (7), the second acousto-optic Q switch (10) and the second total reflector (13) are arranged in sequence along the main optical axis; the planes of the first output mirror (1) and the harmonic reflector (3) are both perpendicular to the main optical axis, and the plane where the 90° optical rotator (5) is located is perpendicular to the main optical axis; the first beam splitter (7) is coated with a 1064nm partially transparent film, the first beam splitter (7) is 45° to the main optical axis, and the plane where the 45° total reflector (8) is located is parallel to the first beam splitter (7); The first acousto-optic Q switch (9) and the third total reflector (14) are sequentially arranged in the reflection direction of the split light of the 45° total reflector (8); the third acousto-optic Q switch (11) and the first total reflector (12) are sequentially arranged in the reflection direction of the split light of the first beam splitter (7); and the planes on which the first total reflector (12), the second total reflector (13) and the third total reflector (14) are located are respectively perpendicular to the optical axes of the split light.

2. The device for improving the shutdown capability of a high-power green laser according to claim 1, characterized in that: Also includes: a second beam splitter (15), a fourth acousto-optic Q switch (16), and a fourth total reflective mirror (17); The second beam splitter (15) is located between the second laser module (6) and the first beam splitter (7), the plane of the second beam splitter (15) is at 45 degrees to the main optical axis and is parallel to the plane of the first beam splitter (7), and the fourth acousto-optic Q switch (16) and the fourth total reflector (17) are arranged in sequence in the splitting optical path of the second beam splitter (15).

3. A device for improving the shutoff capability of a high-power green laser, characterized in that: include: A frequency doubling crystal (2), a first laser module (4), a 90° optical rotator (5), a second laser module (6), a first beam splitter (7), a 45° total reflection mirror (8), a first acousto-optic Q-switch (9), a second acousto-optic Q-switch (10), a third acousto-optic Q-switch (11), a first total reflection mirror (12), a second total reflection mirror (13), a third total reflection mirror (14), and a second output mirror (18); The frequency doubling crystal (2), the second output mirror (18), the first laser module (4), the 90° optical rotator (5), the second laser module (6), the first beam splitter (7), the second acousto-optic Q switch (10) and the second total reflection mirror (13) are arranged in sequence along the main optical axis; the second output mirror (18) is coated with a 1064nm anti-reflection film, the plane of the second output mirror (18) is perpendicular to the main optical axis, and the plane where the 90° optical rotator (5) is located is perpendicular to the main optical axis; the first beam splitter (7) is at a 45° angle to the main optical axis, and the plane where the 45° total reflection mirror (8) is located is parallel to the first beam splitter (7); The first acousto-optic Q switch (9) and the third total reflector (14) are sequentially arranged in the reflection direction of the split light of the 45° total reflector (8); the third acousto-optic Q switch (11) and the first total reflector (12) are sequentially arranged in the reflection direction of the split light of the first beam splitter (7); and the planes on which the first total reflector (12), the second total reflector (13) and the third total reflector (14) are located are respectively perpendicular to the optical axes of the split light.

4. A device for improving the shutoff capability of a high-power green laser, characterized in that: include: A frequency doubling crystal (2), a first laser module (4), a 90° optical rotator (5), a second laser module (6), a first beam splitter (7), a 45° total reflection mirror (8), a first acousto-optic Q-switch (9), a second acousto-optic Q-switch (10), a third acousto-optic Q-switch (11), a first total reflection mirror (12), a second total reflection mirror (13), a third total reflection mirror (14), a fifth total reflection mirror (19), a third output mirror (20), and a sixth total reflection mirror (21); The fifth total reflection mirror (19), the first laser module (4), the 90° optical rotator (5), the second laser module (6), the first beam splitter (7), the second acousto-optic Q switch (10) and the second total reflection mirror (13) are arranged in sequence along the main optical axis; the sixth total reflection mirror (21), the double frequency crystal (2) and the third output mirror (20) are arranged in sequence along the direction parallel to the main optical axis; the fifth total reflection mirror (19) is a 1064nm total reflection mirror, the surface of the third output mirror (20) is coated with a 1064nm total reflection and a 532nm high transmittance film, and the sixth total reflection mirror (21) is a 1064nm and 532nm total reflection mirror; the angle between the fifth total reflection mirror (19) and the third output mirror (20) can make the main optical axis after reflection still parallel to the original optical axis; The plane where the 90° optical rotator (5) is located is perpendicular to the main optical axis; the first beam splitter (7) is coated with a 1064nm partially transparent film, the first beam splitter (7) is 45° to the main optical axis, and the plane where the 45° total reflector (8) is located is parallel to the first beam splitter (7); The first acousto-optic Q switch (9) and the third total reflector (14) are sequentially arranged in the reflection direction of the split light of the 45° total reflector (8); the third acousto-optic Q switch (11) and the first total reflector (12) are sequentially arranged in the reflection direction of the split light of the first beam splitter (7); and the planes on which the first total reflector (12), the second total reflector (13) and the third total reflector (14) are located are respectively perpendicular to the optical axes of the split light.

5. A device for improving the shutoff capability of a high-power green laser, characterized in that: include: A first output mirror (1), a frequency doubling crystal (2), a harmonic reflector (3), a second laser module (6), a first beam splitter (7), a 45° total reflector (8), a first acousto-optic Q switch (9), a second acousto-optic Q switch (10), a third acousto-optic Q switch (11), a first total reflector (12), a second total reflector (13), and a third total reflector (14); The first output mirror (1), the frequency doubling crystal (2), the harmonic reflector (3), the second laser module (6), the first beam splitter (7), the second acousto-optic Q switch (10), and the second total reflector (13) are sequentially arranged along the main optical axis; the planes of the first output mirror (1) and the harmonic reflector (3) are both perpendicular to the main optical axis; the first beam splitter (7) is coated with a 1064 nm partially transparent film; the first beam splitter (7) is at a 45° angle to the main optical axis; and the plane of the 45° total reflector (8) is parallel to the first beam splitter (7); The first acousto-optic Q switch (9) and the third total reflector (14) are sequentially arranged in the reflection direction of the split light of the 45° total reflector (8); the third acousto-optic Q switch (11) and the first total reflector (12) are sequentially arranged in the reflection direction of the split light of the first beam splitter (7); and the planes on which the first total reflector (12), the second total reflector (13) and the third total reflector (14) are located are respectively perpendicular to the optical axes of the split light.

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