A solid-state laser with switchable output laser polarization state

Abstract

The solid-state laser with switchable output laser polarization state provided by the present invention employs a Fabry-Perot etalon placed between a laser crystal assembly and a reflector within a resonant cavity. The modulation module adjusts the tilt angle of the Fabry-Perot etalon to regulate the intra-cavity losses of the linearly polarized light generated by the laser crystal assembly in both the vertical and horizontal polarization directions. This allows the solid-state laser to switch its output laser polarization state. Furthermore, the solid-state laser provided by the present invention has a simple structure, is stable and reliable, and is easy to operate, enabling rapid and accurate switching of the laser's output laser polarization state.

Description

Technical Field

[0001] The present invention relates to the technical field of solid lasers, and in particular to a solid laser capable of switching the polarization state of output lasers. Background Art

[0002] With the continuous development of laser technology, the performance of lasers has been greatly improved. Lasers have gradually developed into ideal light sources with many excellent characteristics such as high power, high efficiency, high beam quality, and compact structure. They are widely used in scientific research, medical treatment, industrial processing and other fields. Diode-pumped solid-state lasers, because they can output linearly polarized light, play an important role in nonlinear frequency change and terahertz research.

[0003] In the field of nonlinear frequency conversion, whether the polarization characteristics of the laser source can match the characteristics of the nonlinear crystal that produces the nonlinear frequency conversion is a key factor affecting the efficiency of nonlinear frequency conversion. However, different nonlinear crystals have different requirements for the polarization characteristics of the laser source. However, for general solid-state lasers, they can generally only output laser light in a single polarization state, which cannot meet the polarization state requirements of different nonlinear crystals.

[0004] Therefore, it is particularly important to design a solid-state laser that can freely switch the output laser polarization state according to the nonlinear crystal polarization characteristics. Summary of the Invention

[0005] The object of the present invention is to provide a solid-state laser capable of switching the output laser polarization state, so as to solve the technical problem that the solid-state laser in the prior art is difficult to switch and output laser sources with different polarization states.

[0006] To solve the above technical problems, the present invention provides a solid-state laser capable of switching the output laser polarization state, comprising:

[0007] A pump module is used to generate pump light and couple it into the resonant cavity;

[0008] a resonant cavity, optically connected to the pump module, comprising an input mirror, a laser crystal assembly, a Fabry-Perot etalon, a reflector, and an output mirror, which are optically connected in sequence;

[0009] The modulation module is electrically connected to the resonant cavity and is used to adjust the tilt angle of the Fabry-Perot etalon to regulate the intra-cavity loss of the linearly polarized light generated by the laser crystal assembly due to stimulation in the vertical polarization direction and the horizontal polarization direction; the tilt angle is the angle between the Fabry-Perot etalon and the direction perpendicular to the linear polarization light.

[0010] Preferably, the pump module comprises a first pump component, and the first pump component is arranged near the incident side of the input mirror;

[0011] The first pump assembly includes a first pump source, a first transmission fiber, and a first coupling lens group. One end of the first transmission fiber is fused to the first pump source, and the first coupling lens group is located between the first transmission fiber and the input mirror.

[0012] Preferably, the pump module further comprises a second pump assembly, and the second pump assembly is arranged near the back side of the reflector;

[0013] The second pump assembly includes a second pump source, a second transmission fiber, and a second coupling lens group. One end of the second transmission fiber is fused to the second pump source, and the second coupling lens group is located between the second transmission fiber and the reflector.

[0014] Preferably, the first pump source and the second pump source are both laser diodes; and the first coupling lens group and the second coupling lens group each include two focusing lenses arranged parallel to each other.

[0015] Preferably, the input mirror is a plane mirror or a concave mirror; the incident surface of the input mirror is coated with a pump light anti-reflection film, and the output surface of the input mirror is coated with a laser high-reflection film, which is used to reflect the linearly polarized light output by the laser crystal component under stimulation.

[0016] Preferably, the laser crystal assembly comprises a first natural birefringent crystal and a second natural birefringent crystal which are spaced apart, the first natural birefringent crystal is stimulated to output a first linearly polarized light, and the second natural birefringent crystal is stimulated to output a second linearly polarized light;

[0017] The polarization state of the first linear polarized light and the polarization state of the second linear polarized light are orthogonal to each other.

[0018] Preferably, the tilt angle is set to θ The refractive index of the Fabry-Perot etalon is n1, and the loss of linearly polarized light in the resonant cavity in the vertical polarization direction is L s , the loss of linearly polarized light in the resonant cavity in the horizontal polarization direction is L P ,but θ 、n1、L s and L p The following relations are satisfied:

[0019] ;

[0020] ;

[0021] ;

[0022] ;

[0023] in, R s( n , θ ) is the reflectivity of the Fabry-Perot etalon in the vertical polarization direction, R p ( n , θ ) is the reflectivity of the Fabry-Perot etalon in the horizontal polarization direction.

[0024] Preferably, the reflector is a plane mirror; the reflective surface of the reflector is coated with a pump light anti-reflection film and a laser high-reflection film, and the back surface of the reflector is coated with a pump light anti-reflection film.

[0025] Preferably, the reflector is a plane mirror, and the angle between the reflector and the optical axis of the resonant cavity is greater than 0 and less than 90°.

[0026] Preferably, the output mirror is a plane mirror or a concave mirror, and the transmittance of the output mirror to linearly polarized light is 2% to 15%.

[0027] The beneficial effects of the present invention are as follows: Unlike the prior art, the solid-state laser with switchable output laser polarization state provided by the present invention disposes a Fabry-Perot etalon between the laser crystal assembly and the reflector within the resonant cavity, and adjusts the tilt angle of the Fabry-Perot etalon via a modulation module to regulate the intra-cavity losses of the linearly polarized light generated by the laser crystal assembly in the vertical and horizontal polarization directions, thereby enabling the solid-state laser to achieve the purpose of switching the output laser polarization state. Furthermore, the solid-state laser provided by the present invention has a simple structure, is stable and reliable, and is easy to operate, capable of quickly and accurately switching the laser output laser polarization state. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a solid-state laser with switchable output laser polarization state provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the connection of a solid-state laser with switchable output laser polarization state provided by an embodiment of the present invention;

[0030] In the figure: 100 - solid-state laser; 10 - pump module; 11 - first pump assembly; 111 - first pump source; 112 - first transmission fiber; 113 - first coupling lens group; 12 - second pump assembly; 121 - second pump source; 122 - second transmission fiber; 123 - second coupling lens group; 20 - resonant cavity; 21 - input mirror; 22 - laser crystal assembly; 23 - Fabry-Perot etalon; 24 - reflector; 25 - output mirror; 30 - modulation module. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0032] The purpose of the present invention is to address the defects of the prior art and provide a solid-state laser 100 capable of switching the polarization state of the output laser, which can realize free switching of the polarization state of the output laser.

[0033] See also Figures 1 to 2 , Figure 1 A schematic diagram of a solid-state laser 100 with switchable output laser polarization state provided by an embodiment of the present invention; Figure 2 A schematic diagram of the connection of a solid-state laser 100 capable of switching the output laser polarization state provided by an embodiment of the present invention; wherein the present invention provides a solid-state laser 100 capable of switching the output laser polarization state, comprising:

[0034] The pump module 10 is used to generate pump light and couple it into the resonant cavity 20;

[0035] The resonant cavity 20 is optically connected to the pump module 10 and includes an input mirror 21, a laser crystal assembly 22, a Fabry-Perot etalon 23, a reflector 24, and an output mirror 25, which are optically connected in sequence;

[0036] The modulation module 30 is electrically connected to the resonant cavity 20. The modulation module 30 is used to adjust the tilt angle θ of the Fabry-Perot etalon 23 to adjust the loss of the linearly polarized light generated by the laser crystal assembly 22 in the vertical polarization direction and the horizontal polarization direction in the resonant cavity 20; the tilt angle θ is the angle between the Fabry-Perot etalon 23 and the direction perpendicular to the linear polarization direction ( Figure 1 the angle between the two axes (direction of the dotted line).

[0037] In an embodiment of the present invention, the pump module 10 includes a first pump assembly 11, which is disposed near the incident side of the input mirror 21. The first pump assembly 11 includes a first pump source 110, a first transmission fiber 112, and a first coupling lens group 113. One end of the first transmission fiber 112 is fused to the first pump source 110, and the first coupling lens group 113 is located between the first transmission fiber 112 and the input mirror 21.

[0038] Specifically, the first pump source 110 generates first pump light. The first transmission fiber 112 efficiently transmits the first pump light to the incident focal point of the first coupling lens assembly 113. During this process, its excellent optical transmission performance ensures minimal energy loss in the first pump light, thereby providing sufficient energy for laser generation. The first coupling lens assembly 113 focuses the first pump light transmitted through the first transmission fiber 112 into the laser crystal assembly 22.

[0039] In this embodiment of the present invention, the pump module 10 further includes a second pump assembly 12, which is disposed near the back surface of the reflector 24. The second pump assembly 12 includes a second pump source 121, a second transmission fiber 122, and a second coupling lens group 123. One end of the second transmission fiber 122 is fused to the second pump source 121, and the second coupling lens group 123 is located between the second transmission fiber 122 and the reflector 24.

[0040] Specifically, the pumping efficiency of the resonant cavity 20 can be further improved by providing the second pumping component 12 .

[0041] Preferably, the first pump source 110 and the second pump source 121 are both 792 nm laser diodes; the first coupling lens group 113 and the second coupling lens group 123 each include two focusing lenses arranged parallel to each other.

[0042] In an embodiment of the present invention, the input mirror 21 is a plane mirror or a concave mirror; the incident surface of the input mirror 21 is coated with a pump light anti-reflection coating, and the exit surface of the input mirror 21 is coated with a laser high-reflection coating, which is used to reflect the linearly polarized light output by the laser crystal assembly 22 under stimulation; the main function of the pump light anti-reflection coating on the incident surface of the input mirror 21 is to reduce the reflection loss of the first pump light when entering the input mirror 21; the exit surface of the input mirror 21 is coated with a laser high-reflection coating, which is mainly used to reflect the linearly polarized light output by the laser crystal assembly 22 under stimulation. Inside the resonant cavity 20, the laser crystal assembly 22 generates linearly polarized light after being excited by the pump light. This linearly polarized light propagates within the resonant cavity. When it reaches the exit surface of the input mirror 21, the laser high-reflection coating can reflect the linearly polarized light back to the resonant cavity 20, allowing the linearly polarized light to continuously travel back and forth within the resonant cavity 20, thereby achieving light gain amplification and ultimately forming a stable laser output.

[0043] In the embodiment of the present invention, the laser crystal assembly 22 includes a first natural birefringent crystal and a second natural birefringent crystal spaced apart from each other. The first natural birefringent crystal is stimulated to output a first linearly polarized light, and the second natural birefringent crystal is stimulated to output a second linearly polarized light.

[0044] The polarization state of the first linear polarized light and the polarization state of the second linear polarized light are orthogonal to each other.

[0045] Specifically, naturally birefringent crystals exhibit anisotropic optical properties. In such crystals, the propagation speed of light is dependent on its polarization direction, and light with different polarization directions experiences different refractive indices. When laser crystal assembly 22 is excited by pump light, atomic or ionic transitions within the crystal, based on this birefringence, produce light with a specific polarization direction. In the present invention, a first naturally birefringent crystal and a second naturally birefringent crystal are spaced apart and excited to output first and second linearly polarized light, respectively.

[0046] In the embodiment of the present invention, the modulation module 30 adjusts the tilt angle θ of the Fabry-Perot etalon 23 to adjust the losses in the resonant cavity 20 in the horizontal polarization direction (polarization direction parallel to the placement table direction, P polarization direction) and the vertical polarization direction (polarization direction perpendicular to the placement table direction, S polarization direction) of the output laser, thereby achieving the purpose of switching the polarization state of the output laser. The specific principles are as follows:

[0047] Set the tilt angle to θ The refractive index of the Fabry-Perot etalon 23 is n1, and the loss of linearly polarized light in the resonant cavity 20 in the vertical polarization direction is L s The loss of linearly polarized light in the resonant cavity 20 in the horizontal polarization direction is L P ,but θ 、n1、L s and L p The following relations are satisfied:

[0048] ;

[0049] ;

[0050] ;

[0051] ;

[0052] in, R s ( n , θ ) is the reflectivity of the Fabry-Perot etalon 23 in the vertical polarization direction, R p ( n , θ ) is the reflectivity of the Fabry-Perot etalon 23 in the horizontal polarization direction.

[0053] When the loss within resonant cavity 20 in the P-polarization direction is significantly greater than the loss within resonant cavity 20 in the S-polarization direction, lasing cannot occur due to the excessive loss in the P-polarization direction, and only S-polarization laser light can be generated. Similarly, when the tilt angle θ of the Bligh-Perot etalon is adjusted so that the loss within resonant cavity 20 in the P-polarization direction is significantly less than the loss within resonant cavity 20 in the S-polarization direction, the laser can output P-polarization laser light.

[0054] In summary, by adjusting the tilt angle θ of the Bligh-Perot etalon and thereby adjusting the losses in the resonant cavity 20 in the P polarization direction and the S polarization direction, the polarization state of the output laser can be switched.

[0055] In the embodiment of the present invention, the reflector 24 is a plane mirror; the reflective surface of the reflector 24 is coated with a pump light anti-reflection film and a laser high-reflection film, and the back surface of the reflector 24 is coated with a pump light anti-reflection film; wherein the reflector 24 is a plane mirror, and the angle between the reflector 24 and the optical axis of the resonant cavity 20 is greater than 0° and less than 90°.

[0056] Specifically, both the reflective and back surfaces of the reflector 24 are coated with a pump light anti-reflection coating. Regarding the reflective surface, when pump light propagates from one side of the laser crystal assembly 22, some of the pump light may reach the reflective surface of the reflector 24. The presence of the pump light anti-reflection coating reduces reflection loss of the pump light at the reflective surface, allowing more pump light to pass through the reflector 24 or, after being effectively reflected by the surface of the reflector 24, continue to propagate within the resonant cavity 20, providing sufficient pump energy for the laser crystal assembly 22. The pump light anti-reflection coating on the back surface prevents pump light incident from the back (e.g., pump light from the second pump assembly 12) from being reflected back. Instead, it allows the pump light to pass through the reflector 24 as much as possible and enter the resonant cavity 20, thereby improving the utilization efficiency of the pump light.

[0057] Specifically, the laser high-reflectivity coating on the reflective surface of reflector 24 is primarily used to reflect the laser light generated by the stimulated laser crystal assembly 22. Within resonant cavity 20, the laser light bounces back and forth between input mirror 21, laser crystal assembly 22, Fabry-Perot etalon 23, reflector 24, and output mirror 25. The high-reflectivity coating on reflector 24 effectively reflects the laser light back into the cavity, ensuring multiple round trips within the cavity and achieving optical gain amplification. This high reflectivity is crucial for maintaining laser oscillation, enabling the laser light to accumulate sufficient energy within the cavity to achieve the desired output power and stable laser output.

[0058] Specifically, the reflector 24 is a plane mirror and its angle with the optical axis of the resonant cavity 20 is greater than 0° and less than 90°. This design allows for flexible adjustment of the laser light path within the resonant cavity 20. By varying the angle between the reflector 24 and the optical axis, the direction of laser light reflection within the cavity can be altered, allowing the laser light to propagate within the cavity at a suitable angle, enabling effective optical coupling and interaction with other optical components (such as the Fabry-Perot etalon 23 and the laser crystal assembly 22).

[0059] In the embodiment of the present invention, the output mirror 25 is a plane mirror or a concave mirror, and the transmittance of the output mirror 25 to linearly polarized light is 2% to 15%.

[0060] Specifically, when output mirror 25 is a plane mirror, it primarily functions as a simple optical interface. As laser light propagates from resonant cavity 20 to output mirror 25, the plane mirror can reflect or transmit a portion of the laser light in a relatively uniform manner. When used as output mirror 25, a concave mirror can focus or collimate the laser light. If properly designed, a concave mirror can alter the divergence of the laser light, converging it to a specific area or adjusting it to produce a parallel beam.

[0061] Specifically, the output mirror 25 has a transmittance of 2% to 15% for linearly polarized light. This transmittance range effectively controls the output energy of the laser. A lower transmittance means that most of the laser light will continue to be reflected and amplified within the resonant cavity 20, and only a small amount of laser light can be output. This allows the laser light to accumulate sufficient energy within the cavity to achieve a higher intracavity power. For applications requiring high power density (such as laser-induced breakdown spectroscopy), this low transmittance setting can achieve higher energy gain within the cavity. Higher transmittance, on the other hand, allows for more laser light output, making it suitable for scenarios where the output power requirement is not particularly high, but a certain intensity of laser light is required for direct external use (such as laser displays).

[0062] Specifically, the working principle of the embodiment of the present invention is as follows: the first pump source 110 and the second pump source 121 in the pump module 10 emit pump light, which enters the laser crystal assembly 22 in the resonant cavity 20 through the first coupling lens group 113 or the second coupling lens group 123. The two natural birefringent crystals in the laser crystal assembly 22 achieve population inversion to produce linearly polarized light. The modulation module 30 adjusts the tilt angle θ of the Fabry-Perot etalon 23 to finely adjust the losses in the resonant cavity 20 in the horizontal and vertical polarization directions of the linearly polarized light. Therefore, under the joint action of the resonant cavity 20 and the Fabry-Perot etalon 23, the purpose of switching the output laser polarization state is achieved.

[0063] The technical solution of the present invention will now be described with reference to specific embodiments.

[0064] Example 1:

[0065] See also Figure 1 as well as Figure 2 Embodiment 1 of the present invention provides a solid-state laser 100 capable of switching the polarization state of output laser light, comprising:

[0066] The pump module 10 is used to generate pump light and couple it into the resonant cavity 20;

[0067] The resonant cavity 20 is optically connected to the pump module 10 and includes an input mirror 21, a laser crystal assembly 22, a Fabry-Perot etalon 23, a reflector 24, and an output mirror 25, which are optically connected in sequence;

[0068] The modulation module 30 is electrically connected to the resonant cavity 20 and is used to adjust the tilt angle of the Fabry-Perot etalon 23 to regulate the loss of the linearly polarized light generated by the laser crystal assembly 22 in the resonant cavity 20 in the vertical polarization direction and the horizontal polarization direction.

[0069] In Embodiment 1 of the present invention, the pump module 10 includes a first pump assembly 11 and a second pump assembly 12. The first pump assembly 11 is disposed near the incident side of the input mirror 21. The first pump assembly 11 includes a first pump source 110, a first transmission fiber 112, and a first coupling lens group 113. One end of the first transmission fiber 112 is fused to the first pump source 110, and the first coupling lens group 113 is located between the first transmission fiber 112 and the input mirror 21. The second pump assembly 12 is disposed near the back side of the reflector 24. The second pump assembly 12 includes a second pump source 121, a second transmission fiber 122, and a second coupling lens group 123. One end of the second transmission fiber 122 is fused to the second pump source 121, and the second coupling lens group 123 is located between the second transmission fiber 122 and the reflector 24.

[0070] Specifically, the first pump source 110 and the second pump source 121 are both 792nm laser diodes; the first coupling lens group 113 and the second coupling lens group 123 each include two focusing lenses arranged parallel to each other; the input mirror 21 is a plane mirror coated with a 792nm high-transmittance film and a 2μm high-reflection film.

[0071] Specifically, the laser crystal assembly 22 is two a-axis cut Tm, Ho:YLF crystals with an end face size of 3mm×3mm and a crystal length of 2.5mm. The incident end face and the output end face of each Tm, Ho:YLF crystal are coated with a 792nm high-transmittance film and a 2μm high-transmittance film; since the a-axis cut Tm, Ho:YLF crystal can produce linearly polarized light with a polarization direction parallel to the c-axis, the above two Tm, Ho:YLF crystals are placed orthogonally to each other along the c-axis.

[0072] Specifically, the thickness of the Fabry-Perot etalon 23 is 1 mm; the reflector 24 is a plane mirror coated with a 792 nm high-transmittance film and a 2 μm high-reflection film, and the angle between the reflector 24 and the optical axis of the resonant cavity 20 is 45°; the output mirror 25 is a concave mirror with a transmittance of 5% at 2 μm and a curvature radius of 103 mm.

[0073] In this first embodiment, when the tilt angle θ between the Fabry-Perot etalon 23 and the input mirror 21 is adjusted to 14.7° via the modulation module 30, the polarization state of the laser light output from the solid-state laser 100 is parallel to the placement table direction, i.e., the P polarization direction. When the tilt angle θ of the Fabry-Perot etalon 23 is adjusted to 32.8° via the modulation module 30, the polarization state of the laser light output from the solid-state laser 100 is perpendicular to the placement table direction, i.e., the S polarization direction. Therefore, by changing the tilt angle θ via the modulation module 30, the polarization state of the laser light output from the solid-state laser 100 can be controlled, thereby achieving the purpose of switchable output laser polarization state.

[0074] In summary, unlike the prior art, the solid-state laser 100 with switchable output laser polarization state provided by the present invention disposes a Fabry-Perot etalon 23 between the laser crystal assembly 22 and the reflector 24 in the resonant cavity 20, and adjusts the tilt angle of the Fabry-Perot etalon 23 through the modulation module 30 to regulate the loss of the linearly polarized light generated by the laser crystal assembly 22 in the vertical polarization direction and the horizontal polarization direction in the resonant cavity 20, thereby enabling the solid-state laser 100 to achieve the purpose of switching the output laser polarization state. At the same time, the solid-state laser 100 provided by the present invention has a simple structure, is stable and reliable, and is easy to operate, and can quickly and accurately switch the polarization state of the laser output laser.

[0075] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For any details not described in individual embodiments, reference may be made to the description in other embodiments.

[0076] The above embodiments merely illustrate the implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A solid-state laser capable of switching the output laser polarization state, characterized in that: include: A pump module is used to generate pump light and couple it into the resonant cavity; a resonant cavity, optically connected to the pump module, comprising an input mirror, a laser crystal assembly, a Fabry-Perot etalon, a reflector, and an output mirror optically connected in sequence; A modulation module is electrically connected to the resonant cavity, and is used to adjust the tilt angle of the Fabry-Perot etalon to regulate the intra-cavity loss of the linearly polarized light generated by the laser crystal assembly due to stimulation in the vertical polarization direction and the horizontal polarization direction; the tilt angle is the angle between the Fabry-Perot etalon and the direction perpendicular to the linearly polarized light.

2. The solid-state laser with switchable output laser polarization state according to claim 1, characterized in that: The pump module includes a first pump component, which is arranged near the incident side of the input mirror; The first pump assembly includes a first pump source, a first transmission fiber, and a first coupling lens group; one end of the first transmission fiber is fused to the first pump source, and the first coupling lens group is located between the first transmission fiber and the input mirror.

3. The solid-state laser with switchable output laser polarization state according to claim 2, characterized in that: The pump module further includes a second pump assembly, which is disposed near the back surface of the reflector; The second pump assembly includes a second pump source, a second transmission fiber, and a second coupling lens group; one end of the second transmission fiber is fused to the second pump source, and the second coupling lens group is located between the second transmission fiber and the reflector.

4. The solid-state laser capable of switching output laser polarization states according to claim 3, characterized in that: The first pump source and the second pump source are both laser diodes; the first coupling lens group and the second coupling lens group both include two focusing lenses arranged parallel to each other.

5. The solid-state laser with switchable output laser polarization state according to claim 1, characterized in that: The input mirror is a plane mirror or a concave mirror; the incident surface of the input mirror is coated with a pump light anti-reflection film, and the output surface of the input mirror is coated with a laser high-reflection film, and the laser high-reflection film is used to reflect the linearly polarized light output by the laser crystal component under stimulation.

6. The solid-state laser capable of switching output laser polarization states according to claim 1, characterized in that: The laser crystal assembly includes a first natural birefringent crystal and a second natural birefringent crystal that are spaced apart, wherein the first natural birefringent crystal is stimulated to output a first linearly polarized light, and the second natural birefringent crystal is stimulated to output a second linearly polarized light; The polarization state of the first linearly polarized light and the polarization state of the second linearly polarized light are orthogonal to each other.

7. The solid-state laser with switchable output laser polarization state according to claim 1, characterized in that: Set the tilt angle to θ The refractive index of the Fabry-Perot etalon is n1, and the loss of the linearly polarized light in the resonant cavity in the vertical polarization direction is L s The loss of the linearly polarized light in the resonant cavity in the horizontal polarization direction is L P ,but θ 、n1、L s and L p The following relations are satisfied: ； ； ； ； in, R s ( n , θ ) is the reflectivity of the Fabry-Perot etalon in the vertical polarization direction, R p ( n , θ ) is the reflectivity of the Fabry-Perot etalon in the horizontal polarization direction.

8. The solid-state laser capable of switching output laser polarization states according to claim 5, characterized in that: The reflector is a plane mirror; the reflective surface of the reflector is coated with the pump light anti-reflection film and the laser high-reflection film, and the back surface of the reflector is coated with the pump light anti-reflection film.

9. The solid-state laser capable of switching output laser polarization states according to claim 5, characterized in that: The reflector is a plane mirror, and the angle between the reflector and the optical axis of the resonant cavity is greater than 0 and less than 90°.

10. The solid-state laser capable of switching output laser polarization states according to claim 5, characterized in that: The output mirror is a plane mirror or a concave mirror, and the transmittance of the output mirror to the linearly polarized light is 2% to 15%.

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