CN113078542B - A kind of orthogonal polarization dual-wavelength laser and method based on Nd:MgO:LN - Google Patents

Abstract

The present disclosure discloses a Nd:MgO:LN-based orthogonal polarization dual-wavelength laser and method. The laser includes an output mirror, a first cavity mirror, a second cavity mirror, a third cavity mirror and a fourth cavity mirror. M-shaped laser resonator; Nd:MgO:LN crystal is arranged between the first cavity mirror and the second cavity mirror; a first convex lens is arranged between the second cavity mirror and the third cavity mirror; Between the fourth cavity mirrors, a polarizing beam splitter prism, a beam combiner, a polarizer, an RTP Q switch, a λ/4 wave plate and a diaphragm are arranged in sequence; Above the beam mirror, a λ/2 wave plate is arranged between the first mirror and the second mirror; the outer side of the first cavity mirror is sequentially arranged with a second coupling mirror group and a second pump module, the second cavity mirror A first coupling mirror group and a first pumping module are arranged on the outside of the mirror in sequence.

Description

A kind of orthogonal polarization dual-wavelength laser and method based on Nd:MgO:LN

technical field

The invention relates to the field of solid-state lasers, in particular to an orthogonal polarization dual-wavelength laser and method based on Nd:MgO:LN.

Background technique

The laser crystal doped with Nd ³⁺ can obtain cross-polarized dual-wavelength laser output. At the same time, the dual-wavelength laser produced by only one Nd ³⁺ crystal can achieve excellent spot mode matching. Due to its simple structure and low laser threshold, such dual-wavelength lasers with synchronous output are widely used in laser precision ranging, laser medicine, spectral analysis and other fields, especially dual-wavelength lasers with a wavelength interval less than 20nm can be used for terahertz (THz) and Differential Absorption Lidar (DIAL).

Nd:MgO:LN is an anisotropic crystal that can simultaneously generate orthogonally polarized 1084nm and 1093nm laser outputs, see the literature "YHWang, YJYu, et al. Study on the regulation mechanism of orthogonally polarised dual-wavelength laser based on Nd ³⁺ doped MgO:LiNbO ₃ , Optics & Laser Technology, 119 (2019) 105570". In order to meet the requirements of differential absorption lidar for near-infrared lasers, the dual-wavelength orthogonally polarized laser based on Nd:MgO:LN needs to operate in a pulsed mechanism to generate dual-wavelength laser pulses. This kind of dual-wavelength laser generally adopts Cr:YAG crystal as the passive Q-switching technology of Q-switching crystal. ₃ , Opt. Mater. 53 (2016) 209–213”. However, the passive Q-switched orthogonal polarization dual-wavelength laser has many defects such as too large pulse width, unadjustable repetition frequency and too low peak power. Due to its high efficiency, fast switching speed, narrow output laser pulse width and high peak power, electro-optic Q-switches have been tried to be applied in Nd:MgO:LN dual-wavelength lasers, in order to obtain narrow pulse widths and tunable repetition frequencies. , High peak power orthogonal polarization dual-wavelength laser output. However, at this stage, the electro-optical Q-switching technology cannot be directly applied to Nd:MgO:LN dual-wavelength lasers because the polarization state of the output dual-wavelength laser is too complex. Electro-optical Q-switching technology utilizes the electro-optical effect of KTP, RTP and other crystals to change the laser polarization state in the resonator by adjusting the loading voltage. According to its working principle, the electro-optical Q-switching only adjusts a single polarization state, and then cooperates with the polarizer to realize the "opening" and "closing" states. However, the polarization states of the 1083 nm and 1094 nm lasers output by the Nd:MgO:LN dual-wavelength laser are in an orthogonal state, and the electro-optical Q-switching technology cannot be used to simultaneously open and close the dual wavelengths in the resonator. The dual-wavelength laser output with narrow pulse width, tunable repetition frequency, and high peak power orthogonal polarization ultimately limits the development of dual-wavelength lasers and affects the research progress in related fields.

SUMMARY OF THE INVENTION

In order to obtain the dual-wavelength laser output with narrow pulse width, adjustable repetition frequency and high peak power orthogonal polarization, the present invention provides an orthogonal polarization dual-wavelength laser and method based on Nd:MgO:LN.

According to an aspect of the present invention, a Nd:MgO:LN-based orthogonally polarized dual-wavelength laser is provided. The laser includes a first pumping module, a first coupling mirror group, a second pumping module, and a second coupling mirror Group, Nd:MgO:LN crystal, output mirror, first cavity mirror, second cavity mirror, first convex lens, third cavity mirror, polarizing beam splitter prism, beam combiner, polarizer, RTP Q switch, λ/4 wave plate, diaphragm, fourth cavity mirror, first mirror, λ/2 wave plate, second mirror, of which:

The output mirror, the first cavity mirror, the second cavity mirror, the third cavity mirror and the fourth cavity mirror form an M-shaped laser resonant cavity;

Nd:MgO:LN crystals are arranged between the first cavity mirror and the second cavity mirror;

A first convex lens is arranged between the second cavity mirror and the third cavity mirror;

Between the third cavity mirror and the fourth cavity mirror, a polarization beam splitting prism, a beam combiner, a polarizer, an RTP Q switch, a λ/4 wave plate and a diaphragm are arranged in sequence;

The first reflecting mirror is located directly above the polarizing beam splitting prism, the second reflecting mirror is located above the beam combiner, and a λ/2 wave plate is arranged between the first reflecting mirror and the second reflecting mirror;

A second coupling mirror group and a second pumping module are sequentially arranged on the outside of the first cavity mirror, and a first coupling mirror group and a first pumping module are arranged on the outside of the second cavity mirror in sequence.

Optionally, the incident surface of the polarization beam splitter prism faces the third cavity mirror, the vertical polarization output surface faces the first reflection mirror, and the horizontal polarization output surface faces the beam combiner.

Optionally, the polarization direction of the polarizer is a horizontal direction.

Optionally, the fast axis of the λ/2 wave plate forms an angle of 45° with the horizontal direction, and the fast axis of the λ/4 wave plate also forms an angle of 45° with the horizontal direction.

Optionally, the output wavelength of the first pump module and the second pump module is 813 nm.

Optionally, the output mirror, the third cavity mirror, the first reflection mirror and the second reflection mirror are plane mirrors.

Optionally, the first cavity mirror, the second cavity mirror and the fourth cavity mirror are plano-concave mirrors.

Optionally, the output mirror is plated with 1084nm and 1093nm semi-permeable films; the first cavity mirror and the second cavity mirror are plated with 813nm antireflection film, 1083nm and 1093nm total reflection films; the third cavity mirror and the fourth cavity mirror The mirror, the first mirror and the second mirror are coated with 1083nm and 1093nm total reflection films.

Optionally, the beam combiner is coated with a 1084nm high transmission film and a 45°1093nm total reflection film.

According to another aspect of the present invention, there is also provided a method for outputting laser light by using any one of the above-mentioned lasers, the method comprising:

Step S1, the first pump module and the second pump module emit 813 nm pump light, and the 813 nm pump light passes through the first coupling mirror group, the second cavity mirror, the second coupling mirror group, and the first cavity mirror from Nd: The two end faces of the MgO:LN crystal are focused to the center of the crystal;

In step S2, the Nd:MgO:LN crystal absorbs the 813 nm pump light to form particle beam inversion, and stimulated emission occurs, generating a horizontally polarized 1084 nm laser and a vertically polarized 1093 nm laser;

In step S3, the horizontally polarized 1084 nm laser and the vertically polarized 1093 nm laser are reflected by the second cavity mirror, enter the first convex lens, and are reflected into the polarizing beam splitter prism by the third cavity mirror, and the vertically polarized 1093 nm laser is directed to the first cavity mirror. Mirror, the horizontally polarized 1084nm laser is directed to the polarizer;

Step S4, after the vertically polarized 1093 nm laser passes through the first reflecting mirror and the λ/2 wave plate, the polarization state is converted to horizontal polarization, and then passes through the second reflecting mirror to the beam combiner, and the horizontally polarized 1093 nm laser is combined with the direct beam. The horizontally polarized 1084nm laser of the beam mirror is combined into a beam of laser light by the beam combiner and passes through the polarizer;

Step S5, when there is no need to emit laser light, the RTP Q switch is controlled to be unloaded with voltage, and the laser light passing through the polarizer passes through the RTP Q switch, the λ/4 wave plate, and the diaphragm in turn and is reflected by the fourth cavity mirror, and then passes through the diaphragm, λ After the /4 wave plate and RTP Q switch, the polarization state of the 1084nm and 1093nm lasers is converted to vertical polarization and cannot pass through the polarizer;

Step S6, when the laser needs to be emitted, the RTP Q switch is controlled to load the λ/4 voltage, and the laser light passing through the polarizer passes through the RTP Q switch, the λ/4 wave plate, and the diaphragm in sequence, and is reflected by the fourth cavity mirror, and then passes through the diaphragm. , λ/4 wave plate, RTP Q switch, the polarization state of 1084nm and 1093nm laser does not change, through the polarizer, the horizontally polarized 1084nm laser is sent to the third cavity mirror through the beam combiner and polarization beam splitter, and the horizontally polarized 1093nm is converted into vertical polarization after beam combiner, second reflector, λ/2 wave plate, and then passes through the first reflector and polarization beam splitter prism, and also shoots to the third cavity mirror, horizontally polarized 1084nm and vertical polarization 1093nm is injected into the Nd:MgO:LN crystal again through the third cavity mirror, the first convex lens and the second cavity mirror, and then reflected by the first cavity mirror, and then emitted by the output mirror. :

The beneficial effects of the invention are: the orthogonally polarized 1084nm and 1094nm are divided into two beams by a polarization beam splitting prism, the vertically polarized 1093nm laser passes through a λ/2 wave plate, and the polarization direction is changed to horizontal polarization, and the horizontally polarized 1084nm laser is polarized The state does not change, the two laser beams are combined at the beam combiner mirror, and then the horizontally polarized 1084nm and 1093nm lasers realize active electro-optical Q-switching under the combined action of polarizer, RTP Q switch and λ/4 wave plate. When the RTP Q switch is not loaded with voltage, the vertically polarized 1084nm and 1093nm lasers cannot pass through the polarizer, that is, the "door closed" state. When the RTP Q switch is loaded with λ/4 voltage, the 1084nm and 1093nm lasers can oscillate in the resonator cavity. , to achieve the "open door" state. Based on the above scheme, by changing the loading voltage of the RTP Q switch, active electro-optical Q-switching can be realized for the orthogonally polarized 1084nm and 1093nm lasers simultaneously, and a dual-wavelength laser with narrow pulse width, adjustable repetition frequency and high peak power orthogonally polarized can be obtained. output. This Nd:MgO:LN-based orthogonally polarized dual-wavelength laser has outstanding features such as compact structure, conversion efficiency, and dual-wavelength operation.

Description of drawings

FIG. 1 is a schematic structural diagram of an orthogonally polarized dual-wavelength laser based on Nd:MgO:LN according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating the conversion of laser polarization state during forward propagation when no voltage is applied to the RTP Q switch according to an embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating the conversion of laser polarization state during reverse propagation when the RTP Q switch is not loaded with a voltage according to an embodiment of the present invention.

4 is a schematic diagram illustrating the conversion of laser polarization state during forward propagation when the RTP Q switch is loaded with a λ/4 voltage according to an embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating the conversion of laser polarization state during reverse propagation when the RTP Q switch is loaded with a λ/4 voltage according to an embodiment of the present invention.

In Figure 1, the structural components referred to by the reference numerals are:

101. First pump module, 201. First coupling mirror group, 102. Second pump module, 202. Second coupling mirror group, 3. Nd:MgO:LN crystal, 4. Output mirror, 5. First Cavity mirror, 6. Second cavity mirror, 7. First convex lens, 8. Third cavity mirror, 9. Polarizing beam splitter prism, 10. Beam combiner, 11. Polarizer, 12. RTP Q switch, 13. λ/ 4 wave plates, 14. diaphragm, 15. fourth cavity mirror, 16. first mirror, 17. λ/2 wave plate, 18. second mirror.

Detailed ways

Hereinafter, exemplary embodiments of the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. Also, for the sake of clarity, parts unrelated to describing the exemplary embodiments are omitted from the drawings.

In embodiments of the present disclosure, it should be understood that terms such as "comprising" or "having" are intended to indicate the presence of features, numbers, steps, acts, components, parts, or combinations thereof disclosed in this specification, and are not intended to be The presence or addition of one or more other features, numbers, steps, acts, components, parts, or combinations thereof is excluded.

In addition, it should be noted that the embodiments of the present disclosure and the features of the embodiments may be combined with each other under the condition of no conflict. The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

FIG. 1 is a schematic structural diagram of a Nd:MgO:LN-based orthogonal polarization dual-wavelength laser according to an embodiment of the present invention. As shown in FIG. 1, the present invention provides the Nd:MgO:LN-based positive An alternately polarized dual-wavelength laser, the laser includes: a first pump module 101, a first coupling mirror group 201, a second pump module 102, a second coupling mirror group 202, Nd:MgO:LN crystal 3, and output mirror 4 , the first cavity mirror 5, the second cavity mirror 6, the first convex lens 7, the third cavity mirror 8, the polarizing beam splitting prism 9, the beam combiner 10, the polarizer 11, the RTP Q switch 12, the λ/4 wave plate 13, Aperture 14, fourth cavity mirror 15, first mirror 16, λ/2 wave plate 17, second mirror 18, wherein:

The output mirror 4, the first cavity mirror 5, the second cavity mirror 6, the third cavity mirror 8 and the fourth cavity mirror 13 form an M-shaped laser resonant cavity;

Nd:MgO:LN crystal 3 is arranged between the first cavity mirror 5 and the second cavity mirror 6;

A first convex lens 7 is arranged between the second cavity mirror 6 and the third cavity mirror 8;

Between the third cavity mirror 8 and the fourth cavity mirror 15, a polarization beam splitting prism 9, a beam combiner 10, a polarizer 11, an RTP Q switch 12, a λ/4 wave plate 13 and a diaphragm 14 are arranged in sequence;

The first reflector 16 is located directly above the polarizing beam splitting prism 9, the second reflector 18 is located above the beam combiner 10, and a λ/ 2 wave plates 17;

A second coupling mirror group 202 and a second pumping module 102 are arranged on the outer side of the first cavity mirror 5 , that is, the side away from the Nd:MgO:LN crystal 3 in sequence. The outer side of the second cavity mirror 6 , that is, a first coupling mirror group 201 and a first pumping module 101 are sequentially disposed on the side away from the Nd:MgO:LN crystal 3 .

The incident surface of the polarization beam splitter prism 9 faces the third cavity mirror 8, the vertical polarization exit surface faces the first reflector 16, and the horizontal polarization exit surface faces the beam combiner 10, that is, the polarization beam splitter The prism 9 divides the incident light into two beams according to the polarization state, the vertically polarized light is directed to the first reflecting mirror 16 , and the horizontally polarized light is directed to the beam combiner 10 .

The polarization direction of the polarizer 11 is the horizontal direction.

The fast axis of the λ/2 wave plate 17 forms an angle of 45° with the horizontal direction, and the fast axis of the λ/4 wave plate 13 also forms an angle of 45° with the horizontal direction.

Further, the output wavelength of the first pump module 101 and the second pump module 102 is 813 nm.

The output mirror 4 , the third cavity mirror 8 , the first reflecting mirror 16 , and the second reflecting mirror 18 are plane mirrors, and the first cavity mirror 5 , the second cavity mirror 6 , and the fourth cavity mirror 15 are plano-concave mirrors.

The output mirror 4 is coated with 1084nm and 1093nm semi-permeable films. The first cavity mirror 5 and the second cavity mirror 6 are coated with 813nm antireflection film, 1083nm and 1093nm total reflection film. The third cavity mirror 8, the fourth cavity mirror 13, the first reflecting mirror 16, and the second reflecting mirror 18 are coated with 1083 nm and 1093 nm total reflection films.

The beam combiner 10 is coated with a 1084nm high transmission film and a 45°1093nm total reflection film.

The specific implementation process of a Nd:MgO:LN-based orthogonal polarization dual-wavelength laser of the present invention is as follows:

As shown in FIG. 1, the 813 nm pump light emitted by the first pump module 101 and the second pump module 102 passes through the first coupling mirror group 201, the second cavity mirror 6, the second coupling mirror group 202, the first cavity mirror group 201, and the first cavity mirror group 202 respectively. The mirror 5 focuses from the two end faces of the Nd:MgO:LN crystal 3 to the center of the crystal. Nd:MgO:LN crystal 3 absorbs 813nm pump light to form particle beam inversion, stimulated emission phenomenon occurs, and generates horizontally polarized 1084nm laser and vertically polarized 1093nm laser, the horizontally polarized 1084nm laser and vertically polarized 1093nm laser After being reflected by the second cavity mirror 6, it enters the first convex lens 7, and after being reflected by the third cavity mirror 8 into the polarization beam splitting prism 9, the vertically polarized 1093 nm laser is directed to the first reflecting mirror 16, and the horizontally polarized 1084 nm laser is directed to the polarization Sheet 10. In the figure, dots represent vertical polarization, bidirectional arrows represent horizontal polarization, and unidirectional arrows represent 45° polarization. After the vertically polarized 1093 nm laser passes through the first reflecting mirror 16 and the λ/2 wave plate 17 , the polarization state is changed to horizontal polarization, and then passes through the second reflecting mirror 18 to the beam combiner 10 . The horizontally polarized 1093 nm laser light and the horizontally polarized 1084 nm laser light directly incident on the beam combiner 10 are combined into one laser beam by the beam combiner 10 and pass through the polarizer 11 . As shown in FIG. 2 , when no voltage is applied to the RTP Q switch 12 , the laser light passing through the polarizer 11 sequentially passes through the RTP Q switch 12 , the λ/4 wave plate 13 , the diaphragm 14 , and is then reflected by the fourth cavity mirror 15 . As shown in FIG. 3 , after the laser reflected by the fourth cavity mirror 15 passes through the diaphragm 14 , the λ/4 wave plate 13 , and the RTP Q switch 12 , the polarization states of the 1084 nm and 1093 nm lasers are converted to vertical polarization and cannot pass through the polarizer 11 , the laser is in the "closed" state at this time. As shown in FIG. 4 , when the RTP Q switch 12 is loaded with a λ/4 voltage, the laser light passing through the polarizer 11 sequentially passes through the RTP Q switch 12 , the λ/4 wave plate 13 , the diaphragm 14 , and is then reflected by the fourth cavity mirror 15 . As shown in FIG. 5 , after the laser reflected by the fourth cavity mirror 15 passes through the diaphragm 14, the λ/4 wave plate 13, and the RTP Q switch 12, the polarization state of the 1084 nm and 1093 nm lasers does not change, and can pass through the polarizer 11. When the laser is in the "open" state. The horizontally polarized 1084 nm laser is emitted to the third cavity mirror 8 through the beam combiner 10 and the polarized beam splitting prism 9 . The horizontally polarized 1093nm is converted to vertical polarization through the beam combiner 10, the second mirror 18, and the λ/2 wave plate 17, and then passes through the first mirror 16 and the polarizing beam splitter prism 9, and also shoots toward the third cavity mirror 8. The horizontal polarization of 1084 nm and the vertical polarization of 1093 nm are injected into the Nd:MgO:LN crystal 3 again through the third cavity mirror 8 , the first convex lens 7 and the second cavity mirror 6 . After that, it is reflected by the first cavity mirror 5 and then emitted out of the cavity by the output mirror 4 .

Compared with the horizontally polarized 1084nm laser, an additional λ/2 wave plate 17 is set in the optical path of the vertically polarized 1093nm laser to convert its polarization state to horizontally polarized, and then the beam combiner 10 is used to pair the horizontally polarized 1084nm and 1093nm lasers. The laser beams are combined to meet the polarization state requirements of the RTP Q switch 12 electro-optical Q-switching. When the RTP Q switch 12 is not loaded with voltage, the 1084nm and 1093nm lasers are in the "gate-off" state at the same time, no oscillation can be formed, and the laser output can be obtained. When the RTP Q switch 12 is loaded with λ/4 voltage, the polarization of the 1084nm and 1093nm lasers does not change, and the “open door” state occurs, and oscillation is formed in the resonator, and the orthogonally polarized 1084nm and 1093nm laser outputs are obtained. Therefore, by changing the loading voltage of the RTP Q switch 12 and controlling the 1084nm and 1093nm lasers to be turned off, active electro-optical Q-switching can be realized, and the 1084nm and 1093nm dual-wavelength laser output with narrow pulse width, adjustable repetition frequency and high peak power orthogonal polarization can be obtained. .

The present invention also provides a method for outputting laser light using the Nd:MgO:LN-based orthogonally polarized dual-wavelength laser, the method comprising the following steps:

Step S1, the first pump module 101 and the second pump module 102 emit 813 nm pump light, and the 813 nm pump light passes through the first coupling mirror group 201, the second cavity mirror 6 and the second coupling mirror group 202, the first The cavity mirror 5 focuses from the two end faces of the Nd:MgO:LN crystal 3 to the center of the crystal;

Step S2, Nd:MgO:LN crystal 3 absorbs 813nm pump light to form particle beam inversion, stimulated emission phenomenon occurs, and generates horizontally polarized 1084nm laser and vertically polarized 1093nm laser;

In step S3, the horizontally polarized 1084 nm laser and the vertically polarized 1093 nm laser are reflected by the second cavity mirror 6, enter the first convex lens 7, and are reflected into the polarizing beam splitter prism 9 by the third cavity mirror 8, and the vertically polarized 1093 nm laser To the first reflecting mirror 16, the horizontally polarized 1084nm laser is directed to the polarizer 10;

In step S4, after the vertically polarized 1093 nm laser passes through the first reflecting mirror 16 and the λ/2 wave plate 17, the polarization state is changed to horizontal polarization, and is then directed to the beam combiner 10 through the second reflecting mirror 18, and the horizontally polarized 1093 nm laser beam and the The horizontally polarized 1084 nm laser directly directed to the beam combiner 10 is combined into a beam of laser light by the beam combiner 10 and passes through the polarizer 11;

In step S5, when no laser light is required to be emitted, the RTP Q switch 12 is controlled to not load a voltage, and the laser light passing through the polarizer 11 is reflected by the fourth cavity mirror 15 after passing through the RTP Q switch 12, the λ/4 wave plate 13 and the diaphragm 14 in sequence, After passing through the diaphragm 14, the λ/4 wave plate 13 and the RTP Q switch 12, the polarization state of the 1084nm and 1093nm lasers is converted to vertical polarization and cannot pass through the polarizer 11;

In step S6, when the laser light needs to be emitted, the RTP Q switch 12 is controlled to load the λ/4 voltage, and the laser light passing through the polarizer 11 passes through the RTP Q switch 12, the λ/4 wave plate 13, and the diaphragm 14 in sequence, and then is captured by the fourth cavity mirror 15. After reflection, after passing through the diaphragm 14, the λ/4 wave plate 13, and the RTP Q switch 12, the polarization state of the 1084nm and 1093nm lasers does not change. After passing through the polarizer 11, the horizontally polarized 1084nm laser passes through the beam combiner 10 and the polarization beam splitter prism. 9. It is directed to the third cavity mirror 8, and the horizontally polarized 1093 nm beam is converted to vertical polarization through the beam combiner 10, the second reflecting mirror 18, and the λ/2 wave plate 17, and then passes through the first reflecting mirror 16 and polarization beam splitting. The prism 9 is also directed to the third cavity mirror 8, and the horizontal polarization of 1084 nm and the vertical polarization of 1093 nm pass through the third cavity mirror 8, the first convex lens 7 and the second cavity mirror 6, and then enter the Nd:MgO:LN crystal 3 again, and then It is reflected by the first cavity mirror 5 and then emitted by the output mirror 4 .

Wherein, the meanings and explanations of the technical features in the method for using the Nd:MgO:LN-based orthogonally polarized dual-wavelength laser to output laser light are the same as the meanings and explanations of the technical features in the laser above, and will not be repeated here. .

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present disclosure in detail. It should be understood that the above-mentioned specific embodiments are only specific embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included within the protection scope of the present disclosure.

Claims (10)

1. an orthogonal polarization dual-wavelength laser based on Nd:MgO:LN, is characterized in that, described laser comprises the first pumping module, the first coupling mirror group, the second pumping module, the second coupling mirror group, Nd:MgO:LN crystal, output mirror, first cavity mirror, second cavity mirror, first convex lens, third cavity mirror, polarizing beam splitter prism, beam combiner, polarizer, RTP Q switch, λ/4 wave plate, diaphragm, fourth cavity mirror, first reflector, λ/2 wave plate, second reflector, among which: The output mirror, the first cavity mirror, the second cavity mirror, the third cavity mirror and the fourth cavity mirror form an M-shaped laser resonant cavity; Nd:MgO:LN crystals are arranged between the first cavity mirror and the second cavity mirror; A first convex lens is arranged between the second cavity mirror and the third cavity mirror; Between the third cavity mirror and the fourth cavity mirror, a polarization beam splitting prism, a beam combiner, a polarizer, an RTP Q switch, a λ/4 wave plate and a diaphragm are arranged in sequence; The first reflecting mirror is located directly above the polarizing beam splitting prism, the second reflecting mirror is located above the beam combiner, and a λ/2 wave plate is arranged between the first reflecting mirror and the second reflecting mirror; A second coupling mirror group and a second pumping module are sequentially arranged on the outside of the first cavity mirror, and a first coupling mirror group and a first pumping module are arranged on the outside of the second cavity mirror in sequence; When there is no need to emit laser light, control the RTP Q switch without loading voltage, and the laser light passing through the polarizer passes through the RTP Q switch, the λ/4 wave plate, and the diaphragm in turn, and is reflected by the fourth cavity mirror, and then passes through the diaphragm, λ/4 wave After the RTP Q switch, the polarization state of the 1084nm and 1093nm lasers is converted to vertical polarization and cannot pass through the polarizer; when the laser needs to be emitted, the RTP Q switch is controlled to load λ/4 voltage, and the laser passing through the polarizer passes through the RTP Q switch in turn. , λ/4 wave plate, the diaphragm is reflected by the fourth cavity mirror, and then after the diaphragm, λ/4 wave plate, RTP Q switch, the polarization state of the 1084nm and 1093nm laser does not change, through the polarizer, the horizontal polarization The 1084nm laser is transmitted to the third cavity mirror through the beam combiner and polarized beam splitter prism, and the horizontally polarized 1093nm laser is converted to vertical polarization through the beam combiner, the second reflector, and the λ/2 wave plate, and then passes through the first reflection. The mirror and the polarizing beam splitter prism are also directed to the third cavity mirror, the horizontal polarization 1084nm and the vertical polarization 1093nm pass through the third cavity mirror, the first convex lens and the second cavity mirror, and then enter the Nd:MgO:LN crystal again, and then pass through the third cavity mirror, the first convex lens and the second cavity mirror. A cavity mirror is reflected, and then it is emitted by the output mirror. 2 . The laser according to claim 1 , wherein the incident surface of the polarization beam splitting prism faces the third cavity mirror, the vertical polarization exit surface faces the first reflection mirror, and the horizontal polarization exit surface faces the beam combiner. 3. The laser according to claim 1 or 2, wherein the polarization direction of the polarizer is a horizontal direction. 4. The laser according to claim 1 or 2, wherein the fast axis of the λ/2 wave plate and the horizontal direction are at a 45° angle, and the fast axis of the λ/4 wave plate is also in the horizontal direction. 45° angle. 5. The laser according to claim 1 or 2, wherein the output wavelength of the first pump module and the second pump module is 813 nm. 6. The laser according to claim 1 or 2, wherein the output mirror, the third cavity mirror, the first reflection mirror and the second reflection mirror are plane mirrors. 7. The laser according to claim 1 or 2, wherein the first cavity mirror, the second cavity mirror and the fourth cavity mirror are plano-concave mirrors. 8. The laser according to claim 1 or 2, wherein the output mirror is plated with 1084nm and 1093nm semi-permeable films; the first cavity mirror and the second cavity mirror are plated with 813nm antireflection film, 1083nm and 1093nm full Reflective film; the third cavity mirror, the fourth cavity mirror, the first reflecting mirror and the second reflecting mirror are coated with 1083nm and 1093nm total reflection films. 9 . The laser according to claim 1 or 2 , wherein the beam combiner mirror is coated with a 1084 nm high-transmission film and a 45° 1093 nm total reflection film. 10 . 10. A method for outputting laser light using any one of the lasers of claims 1-9, wherein the method comprises: Step S1, the first pump module and the second pump module emit 813 nm pump light, and the 813 nm pump light passes through the first coupling mirror group, the second cavity mirror, the second coupling mirror group, and the first cavity mirror from Nd: The two end faces of the MgO:LN crystal are focused to the center of the crystal; In step S2, the Nd:MgO:LN crystal absorbs the 813 nm pump light to form particle beam inversion, and stimulated emission occurs, generating a horizontally polarized 1084 nm laser and a vertically polarized 1093 nm laser; In step S3, the horizontally polarized 1084 nm laser and the vertically polarized 1093 nm laser are reflected by the second cavity mirror, enter the first convex lens, and are reflected into the polarizing beam splitter prism by the third cavity mirror, and the vertically polarized 1093 nm laser is directed to the first cavity mirror. Mirror, the horizontally polarized 1084nm laser is directed to the polarizer; Step S4, after the vertically polarized 1093 nm laser passes through the first reflecting mirror and the λ/2 wave plate, the polarization state is converted to horizontal polarization, and then passes through the second reflecting mirror to the beam combiner, and the horizontally polarized 1093 nm laser is combined with the direct beam. The horizontally polarized 1084nm laser of the beam mirror is combined into a beam of laser light by the beam combiner and passes through the polarizer; Step S5, when there is no need to emit laser light, the RTP Q switch is controlled to be unloaded with voltage, and the laser light passing through the polarizer passes through the RTP Q switch, the λ/4 wave plate, and the diaphragm in turn and is reflected by the fourth cavity mirror, and then passes through the diaphragm, λ After the /4 wave plate and RTP Q switch, the polarization state of the 1084nm and 1093nm lasers is converted to vertical polarization and cannot pass through the polarizer; Step S6, when the laser needs to be emitted, the RTP Q switch is controlled to load the λ/4 voltage, and the laser light passing through the polarizer passes through the RTP Q switch, the λ/4 wave plate, and the diaphragm in sequence, and is then reflected by the fourth cavity mirror, and then passes through the diaphragm. , λ/4 wave plate, RTP Q switch, the polarization state of 1084nm and 1093nm laser does not change, through the polarizer, the horizontally polarized 1084nm laser is sent to the third cavity mirror through the beam combiner and polarizing beam splitter prism, and the horizontally polarized 1084nm laser is 1093nm is converted to vertical polarization after beam combiner, second reflector, λ/2 wave plate, and then passes through the first reflector and polarization beam splitter prism, and also shoots to the third cavity mirror, horizontally polarized 1084nm and vertical polarization 1093nm is injected into the Nd:MgO:LN crystal again through the third cavity mirror, the first convex lens and the second cavity mirror, and then reflected by the first cavity mirror, and then emitted by the output mirror.

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