Optical resonant cavity and 1200nm laser

Abstract

The invention relates to the technical field of lasers, in particular to an optical resonant cavity and a 1200nm laser, which comprises an optical resonant cavity outer cylinder, an optical resonant cavity inner cylinder is arranged in the optical resonant cavity outer cylinder, and a gain medium is arranged in the optical resonant cavity inner cylinder. The beneficial effects are that through improvement of the optical resonant cavity outer cylinder and the lens installation outer cylinder, the heat dissipation cavity is formed between the optical resonant cavity inner cylinder and the optical resonant cavity outer cylinder, and the heat dissipation fins outside the optical resonant cavity inner cylinder can increase the heat dissipation area of the optical resonant cavity inner cylinder. And the lens fixing ring, the aperture adjusting sheet and the adjusting gear ring assembly are matched, so that the angle of the reflecting mirror is finely adjusted, and high centering precision and multi-degree-of-freedom adjustment are realized. And the lens correction ring rotates, so that the extrusion pad uniformly performs rotary centering extrusion on the outer side of the lens fixing ring, and performs primary centering correction on the position of the lens fixing ring, so that an ideal propagation path of a light beam in the resonant cavity is kept, and unnecessary energy loss is reduced.

Description

Technical Field

[0001] This invention belongs to the field of laser technology, specifically relating to optical resonators and 1200nm lasers. Background Technology

[0002] A 1200nm laser is a laser with a specific wavelength, widely used in scientific research, industrial processing, and medical fields. Because 1200nm is located in the near-infrared region, it has a high penetration depth, making it suitable for applications in biological tissues and semiconductor materials. Compared to shorter wavelength lasers, 1200nm lasers absorb less water, resulting in lower thermal effects, making them suitable for precision machining and minimally invasive surgery. Since the human eye is not sensitive to 1200nm light, it is relatively safe to use, reducing the risk of eye injury to operators. An optical resonant cavity is an essential component of a laser, typically consisting of two planar or concave spherical mirrors perpendicular to the axis of the activation medium. One mirror completely reflects light, while the other partially transmits it. A gain medium is placed between the two mirrors to amplify the optical signal. A pump source provides energy to the gain medium, causing it to produce stimulated emission. The working principle is that when the gain medium is excited by the pump source, the generated photons reflect back and forth between the two mirrors, forming a standing wave mode. Only photons that meet specific conditions (such as wavelength and frequency) can be significantly amplified within the resonant cavity, thus forming a stable laser output. When using a laser optical resonator, multiple sets of lenses need to be aligned to ensure that the indicator light passes through the center of the lens. However, aligning and adjusting multiple sets of lenses takes time, and the effect after adjustment is not very obvious.

[0003] A Chinese patent document with publication number CN105846298B proposes an optical resonant cavity. It solves the above-mentioned technical problem by adding a positioning pin, a first buffer, a second buffer, and a limiting block. The positioning pin can ensure the direction of the output light from the output mirror. However, the positioning pin is mainly used to position the output mirror and cannot adjust the two side mirrors of the optical resonant cavity.

[0004] Therefore, this invention proposes an optical resonant cavity and a 1200nm laser, which solves the problem that the positioning pins in the prior art are mainly used for positioning the output mirror and cannot adjust the mirrors on both sides of the optical resonant cavity. By improving the lens mounting structure at both ends of the optical resonant cavity and cooperating with the laser output aperture adjustment structure, the lenses at both ends of the optical resonant cavity can be simultaneously aligned and corrected while adjusting the laser output beam, thus achieving the purpose of being easy to use. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an optical resonant cavity and a 1200nm laser to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an optical resonant cavity, comprising an outer cylinder of the optical resonant cavity, an inner cylinder of the optical resonant cavity disposed inside the outer cylinder of the optical resonant cavity, a gain medium disposed inside the inner cylinder of the optical resonant cavity, optical resonant cavity fixing rings fixedly mounted on the outer surfaces of both ends of the inner cylinder of the optical resonant cavity, the outer surfaces of the optical resonant cavity fixing rings being fixedly connected to the inner surfaces of the outer cylinder of the optical resonant cavity, and lens mounting outer cylinders disposed at both ends of the outer cylinder of the optical resonant cavity.

[0007] Preferably, the outer surface of the inner cylinder of the optical resonant cavity is uniformly distributed with heat dissipation fins, and heat dissipation movable rings are movably installed at both ends of the inner wall of the outer cylinder of the optical resonant cavity. A heat dissipation silicone pad is uniformly distributed on one side of the outer surface of the heat dissipation movable ring, and a heat dissipation groove adapted to the heat dissipation silicone pad is opened on the inner wall of the outer cylinder of the optical resonant cavity. A movable grid is fixedly installed between the heat dissipation movable rings on both sides.

[0008] Preferably, a sealing cover is fixedly installed at one end of the lens mounting outer cylinder, and a laser output hole is provided in the middle of the sealing cover. A lens mounting inner cylinder is fixedly installed on the inner side of the end of the lens mounting outer cylinder that is connected to the optical resonant cavity outer cylinder, and an adjustment pad is fixedly installed at one end of the lens mounting inner cylinder.

[0009] Preferably, a lens fixing ring is provided on the outside of the lens mounting inner cylinder, an adjusting washer adapted to the adjusting pad is fixedly installed on the inner side of the lens fixing ring, a mounting ring is provided on one side of the lens fixing ring, and a reflective lens is fixedly installed between the mounting ring and the lens fixing ring by bolts.

[0010] Preferably, the lens mounting outer cylinder has aperture adjustment plates evenly distributed on the side surface near the enclosure. The aperture adjustment plates are rotatably mounted on the side wall of the lens mounting outer cylinder, and a gear is fixedly mounted on one end of the output shaft of the aperture adjustment plate.

[0011] Preferably, the lens is movably mounted on the side wall of the outer cylinder with an adjusting gear ring assembly. An inner gear ring that meshes with a gear is fixedly mounted on the inner side of the adjusting gear ring assembly, and a lens correction ring is fixedly mounted on the outer side of the adjusting gear ring assembly.

[0012] Preferably, a lens correction ring is fixedly installed on one side of the inner tooth ring of the adjusting tooth ring assembly, and compression pads are evenly distributed on the inner surface of the lens correction ring, with the inner surface of the compression pads in contact with the outer surface of the lens fixing ring.

[0013] Preferably, an indicator ring is fixedly installed in the middle of the outer surface of the lens mounting outer cylinder, the adjusting toothed ring assembly is disposed on one side of the indicator ring, elastic indicator push blocks are evenly distributed inside the indicator ring, and the inner side of the elastic indicator push block is provided with a locking groove that matches the indicator arrow.

[0014] A 1200nm laser includes a laser mounting platform, a pump source is disposed on one side of the laser mounting platform, a filter element is disposed at the output end of the pump source, a control system component is disposed on one side of the upper surface of the laser mounting platform, and the 1200nm laser also includes an optical resonant cavity.

[0015] Compared with the prior art, the beneficial effects of the present invention are: By improving the outer cylinder of the optical resonator and the outer cylinder of the lens mounting cylinder, a heat dissipation cavity is formed between the inner cylinder and the outer cylinder of the optical resonator. The heat dissipation fins on the outside of the inner cylinder can increase the heat dissipation area of ​​the inner cylinder, ensuring the stability and reliability of the laser. The lens fixing ring, aperture adjustment plate, and adjustment gear ring assembly work together to achieve fine adjustment of the reflector angle, realizing high alignment accuracy and multi-degree-of-freedom adjustment. By rotating the adjustment gear ring assembly externally, the inner gear ring and the lens correction ring on the inner side of the adjustment gear ring assembly rotate synchronously. The rotation of the inner gear ring can drive the gear to rotate synchronously, so as to rotate the aperture adjustment plate to adjust the output aperture of the sealing cover. The rotation of the lens correction ring causes the compression pad to uniformly rotate and compress the outer side of the lens fixing ring, performing a one-time alignment correction of the position of the lens fixing ring, so that the beam maintains an ideal propagation path in the resonator and reduces unnecessary energy loss. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the outer cylinder of the optical resonant cavity of the present invention; Figure 3 This is a schematic diagram of the lens mounting outer cylinder mounting structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the outer cylinder of the optical resonant cavity of the present invention; Figure 5 This is a schematic diagram of the disassembly structure of the outer cylinder of the optical resonant cavity of the present invention; Figure 6 This is a schematic diagram of one side of the overall structure of the lens mounting outer cylinder of the present invention; Figure 7 This is a schematic diagram of the other side of the overall structure of the lens mounting outer cylinder of the present invention; Figure 8 This is a schematic diagram of the structure of the lens mounting outer cylinder after disassembly according to the present invention; Figure 9 This is a schematic diagram of the other side of the lens mounting outer cylinder after disassembly. Figure 10 This is a schematic diagram of the lens mounting inner cylinder after disassembly according to the present invention; Figure 11This is a schematic cross-sectional view of the lens mounting inner cylinder structure of the present invention; Figure 12 This is a schematic diagram of the adjusting gear ring assembly and the indicator ring structure of the present invention; Figure 13 This is a schematic diagram of the internal structure of the indicator ring of the present invention.

[0017] In the diagram: 1. Optical resonant cavity outer cylinder; 11. Heat dissipation movable ring; 111. Heat dissipation silicone pad; 112. Movable grid; 12. Optical resonant cavity inner cylinder; 121. Optical resonant cavity fixing ring; 122. Heat dissipation fins; 13. Gain medium; 2. Lens mounting outer cylinder; 21. Sealing cover; 211. Laser output hole; 22. Lens mounting inner cylinder; 221. Adjustment pad; 23. Lens fixing ring; 231. Mounting ring; 232. Adjustment washer; 24. Reflecting lens; 25. Aperture adjustment piece; 251. Gear; 26. Adjustment gear ring assembly; 261. Lens correction ring; 2611. Squeezing pad; 262. Indicator arrow; 27. Indicator ring; 271. Elastic indicator push block; 3. Laser mounting platform; 4. Control system components; 5. Pump source; 6. Filtering element. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1, please refer to Figures 1 to 13This invention provides a technical solution: an optical resonant cavity, including an outer cylinder 1, an inner cylinder 12, and a gain medium 13. Optical resonant cavity fixing rings 121 are fixedly mounted on the outer surfaces of both ends of the inner cylinder 12, and their outer surfaces are fixedly connected to the inner surfaces of the outer cylinder 1. Lens mounting outer cylinders 2 are provided at both ends of the outer cylinder 1. Heat dissipation fins 122 are uniformly distributed on the outer surface of the inner cylinder 12. Heat dissipation rings 11 are movably mounted at both ends of the inner wall of the outer cylinder 1. Heat dissipation silicone pads 111 are evenly distributed on one side of the outer surface of each heat dissipation ring 11. Heat dissipation grooves adapted to the heat dissipation silicone pads 111 are formed on the inner wall of the outer cylinder 1. Movable grids 112 are fixedly installed between the two heat dissipation rings 11. In this embodiment, the outer cylinder 1 and the inner cylinder 12 of the optical resonant cavity form a complete laser cylinder with an optical resonant cavity. The gain medium 13 inside the inner cylinder 12 is the core part of the laser, absorbing the pump energy emitted by the pump source 5 and emitting stimulated emission light. To amplify the optical signal, erbium-doped fiber and semiconductor materials can be used. Erbium ions have excellent luminescence characteristics in the 1200nm wavelength range, and semiconductor materials are suitable for directly generating 1200nm wavelength lasers. Simultaneously, the optical resonant cavity fixing ring 121 serves to mount the inner cylinder 12 of the optical resonant cavity inside the outer cylinder 1, forming a heat dissipation cavity between the inner cylinder 12 and the outer cylinder 1. The heat dissipation fins 122 on the outside of the inner cylinder 12 increase the heat dissipation area of ​​the inner cylinder 12, allowing heat from inside the inner cylinder 12 to dissipate through the heat dissipation fins 122. The heat is dissipated into the heat dissipation cavity between the inner cylinder 12 and the outer cylinder 1 of the optical resonant cavity, and further dissipated through the movable grid 112 and the heat dissipation silicone pad 111. At the same time, grooves are provided at both ends of the outer cylinder 1 of the optical resonant cavity to allow the heat dissipation movable ring 11 to rotate. After the heat dissipation movable ring 11 rotates, it is squeezed, which opens the heat dissipation groove of the outer cylinder 1 of the optical resonant cavity, maximizes the heat dissipation effect of the inner cylinder 12 of the optical resonant cavity, and further releases the heat accumulated inside the heat dissipation cavity of the outer cylinder 1 and the inner cylinder 12 of the optical resonant cavity into the air, ensuring the stability and reliability of the laser.

[0020] Example 2, please refer to Figures 1 to 13Based on Embodiment 1, this embodiment further proposes that a sealing cover 21 is fixedly installed at one end of the lens mounting outer cylinder 2, and a laser output hole 211 is provided in the middle of the sealing cover 21. A lens mounting inner cylinder 22 is fixedly installed on the inner side of the end of the lens mounting outer cylinder 2 that connects to the optical resonant cavity outer cylinder 1. An adjusting shim 221 is fixedly installed at one end of the lens mounting inner cylinder 22. A lens fixing ring 23 is provided on the outside of the lens mounting inner cylinder 22. An adjusting shim 232 adapted to the adjusting shim 221 is fixedly installed on the inner side of the lens fixing ring 23. A mounting ring 231 is provided on one side of the lens fixing ring 23. A reflecting lens 24 is fixedly installed between the mounting ring 231 and the lens fixing ring 23 by bolts. 2. Aperture adjustment plates 25 are evenly distributed on one side surface near the enclosure 21. The aperture adjustment plates 25 are rotatably mounted on the side wall of the lens mounting outer cylinder 2. A gear 251 is fixedly mounted on one end of the output shaft of the aperture adjustment plate 25. An adjustment gear ring assembly 26 is movably mounted on the side wall of the lens mounting outer cylinder 2. An internal gear ring that meshes with the gear 251 is fixedly mounted on the inner side of the adjustment gear ring assembly 26. A lens correction ring 261 is fixedly mounted on the outer side of the adjustment gear ring assembly 26. A lens correction ring 261 is fixedly mounted on one side of the internal gear ring of the adjustment gear ring assembly 26. A compression pad 2611 is evenly distributed on the inner surface of the lens correction ring 261. The inner surface of the compression pad 2611 is in contact with the outer surface of the lens fixing ring 23.In this embodiment, the lens mounting outer cylinder 2 is installed at both ends of the optical resonant cavity outer cylinder 1, and has the same structure. It is used to install two reflective lenses 24 located at both ends of the gain medium 13. The sealing cover 21 is installed on one side of the lens mounting outer cylinder 2 and cooperates with the aperture adjustment plate 25 to allow the actual size of the laser output aperture 211 to be adjusted, which facilitates the adjustment of the laser output aperture. The lens mounting inner cylinder 22 is connected to the lens fixing ring 23 through the adjustment pad 221 and the adjustment washer 232. The lens fixing ring 23 is used to install and fix the reflective lens 24 through the mounting ring 231, which makes the reflective lens 24 easy to disassemble and maintain. At the same time, the adjustment pad 221 and the adjustment washer 232 are interlocking washers to achieve fine adjustment of the angle of the reflector, realize high alignment accuracy and multi-degree-of-freedom adjustment. By combining washers of different thicknesses or shapes, adjustments can be made in multiple degrees of freedom to ensure the reflective lens 24 is properly aligned. The mirrors are perfectly aligned, and the tightly fitted gasket structure enhances the rigidity of the lens fixing ring 23, reducing the impact of external vibrations on the reflecting mirror 24 and providing greater stability. This prevents the reflecting mirror 24 from drifting due to temperature changes or mechanical stress. Specifically, the adjustment method involves rotating the external adjusting gear assembly 26, causing the inner gear ring and lens correction ring 261 to rotate synchronously. The rotation of the inner gear ring drives the gear 251 to rotate synchronously, thereby rotating the aperture adjustment piece 25 to adjust the output aperture of the sealing cover 21. The rotation of the lens correction ring 261 causes the compression pad 2611 to uniformly rotate and compress the outer side of the lens fixing ring 23, performing a single alignment correction of the lens fixing ring 23. This ensures the beam maintains an ideal propagation path within the resonant cavity, reducing unnecessary energy loss and improving the directionality and focusing performance of the output beam.

[0021] Example 3, please refer to Figures 1 to 13 Based on Embodiment 2, this embodiment further proposes that an indicator ring 27 is fixedly installed in the middle of the outer surface of the lens mounting outer cylinder 2, and an adjustment gear ring assembly 26 is set on one side of the indicator ring 27. Elastic indicator push blocks 271 are evenly distributed inside the indicator ring 27, and the inner side of the elastic indicator push blocks 271 is provided with a locking groove adapted to the indicator arrow 262. In this embodiment, when the adjustment gear ring assembly 26 is rotated, the indicator arrow 262 will sequentially push the elastic indicator push blocks 271 to move and engage. The elastic indicator push blocks 271 and the indicator arrow 262 mainly serve to indicate the rotational position of the adjustment gear ring assembly 26, ensuring that the adjustment positions at both ends are unified. Furthermore, the elastic indicator push blocks 271 are evenly and independently distributed inside the indicator ring 27, and each elastic indicator push block 271 has an independent spring on its rear side, allowing the elastic indicator push blocks 271 to engage with the position of the indicator arrow 262 when the indicator arrow 262 is stationary, keeping the adjustment gear ring assembly 26 stationary and further improving the focusing stability of the beam.

[0022] Example 4, please refer to Figures 1 to 13Based on Embodiment 3, this embodiment further proposes a 1200nm laser, including a laser mounting platform 3, a pump source 5 disposed on one side of the laser mounting platform 3, a filter element 6 disposed at the output end of the pump source 5, and a control system component 4 disposed on one side of the upper surface of the laser mounting platform 3. The 1200nm laser also includes the aforementioned optical resonant cavity. In this embodiment, the control system component 4 plays a centralized control role. The pump energy emitted by the pump source 5 is filtered by the filter element 6 and enters the inner cylinder 12 of the optical resonant cavity, where it is amplified by the gain medium 13. The laser mounting platform 3 mainly serves to mount various components. Improvements to the outer cylinder 1 of the optical resonant cavity and the outer cylinder 2 of the lens mounting can be combined with the laser output aperture adjustment structure to adjust the laser output beam while simultaneously aligning and correcting the lenses at both ends of the optical resonant cavity, thus achieving the purpose of ease of use.

[0023] Example 5, please refer to Figures 1 to 13 Based on Embodiment 4, this embodiment also proposes a method for using the optical resonant cavity and a 1200nm laser, including the following steps: Step 1, the pump source 5 emits pump energy, which enters the inner cylinder 12 of the optical resonant cavity through the filter element 6 and is amplified by the gain medium 13 to generate a 1200nm wavelength laser; Step 2, by rotating the adjusting gear ring assembly 26, the inner gear ring and the lens correction ring 261 on the inner side of the adjusting gear ring assembly 26 rotate synchronously, which can drive the gear 251 to rotate synchronously, so as to achieve the purpose of rotating the aperture adjustment piece 25 to adjust the output aperture of the sealing cover 21. The rotation of the lens correction ring 261 causes the compression pad 2611 to uniformly rotate and center the outer side of the lens fixing ring 23, and the position of the lens fixing ring 23 is centered and corrected once, improving the directionality and focusing performance of the output beam; Step 3, the elastic indicator push block 271 can engage the position of the indicator arrow 262 when the indicator arrow 262 is stationary, so that the adjusting gear ring assembly 26 remains stationary, ensuring that the direction and focus of the beam remain unchanged.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An optical resonant cavity, comprising an outer cylinder (1) of the optical resonant cavity, characterized in that: The optical resonant cavity outer cylinder (1) is provided with an optical resonant cavity inner cylinder (12), and the optical resonant cavity inner cylinder (12) is provided with a gain medium (13). Optical resonant cavity fixing rings (121) are fixedly installed on the outer surfaces of both ends of the optical resonant cavity inner cylinder (12). The outer surface of the optical resonant cavity fixing rings (121) is fixedly connected to the inner surface of the optical resonant cavity outer cylinder (1). Lens mounting outer cylinders (2) are provided at both ends of the optical resonant cavity outer cylinder (1).

2. An optical resonant cavity according to claim 1, characterized in that: The outer surface of the inner cylinder (12) of the optical resonant cavity is uniformly distributed with heat dissipation fins (122). The inner walls of the outer cylinder (1) of the optical resonant cavity are respectively movably installed with heat dissipation rings (11). The outer surface of one side of the heat dissipation rings (111) is uniformly distributed with heat dissipation silicone pads (111). The inner wall of the outer cylinder (1) of the optical resonant cavity is provided with heat dissipation grooves that are adapted to the heat dissipation silicone pads (111). Movable grids (112) are fixedly installed between the heat dissipation rings (111) on both sides.

3. An optical resonant cavity according to claim 1, characterized in that: A sealing cover (21) is fixedly installed at one end of the lens mounting outer cylinder (2). A laser output hole (211) is provided in the middle of the sealing cover (21). A lens mounting inner cylinder (22) is fixedly installed on the inner side of the end of the lens mounting outer cylinder (2) that is connected to the optical resonant cavity outer cylinder (1). An adjustment pad (221) is fixedly installed at one end of the lens mounting inner cylinder (22).

4. An optical resonant cavity according to claim 3, characterized in that: The lens mounting inner cylinder (22) is provided with a lens fixing ring (23) on the outside. An adjusting washer (232) adapted to the adjusting pad (221) is fixedly installed on the inner side of the lens fixing ring (23). A mounting ring (231) is provided on one side of the lens fixing ring (23). A reflective lens (24) is fixedly installed between the mounting ring (231) and the lens fixing ring (23) by bolts.

5. An optical resonant cavity according to claim 1, characterized in that: The lens mounting outer cylinder (2) has a uniformly distributed aperture adjustment plate (25) on the side surface near the enclosure (21). The aperture adjustment plate (25) is rotatably mounted on the side wall of the lens mounting outer cylinder (2). A gear (251) is fixedly mounted on one end of the output shaft of the aperture adjustment plate (25).

6. An optical resonant cavity according to claim 1, characterized in that: The lens is mounted on the side wall of the outer cylinder (2) and an adjusting gear ring assembly (26) is movably installed. An inner gear ring that meshes with the gear (251) is fixedly installed on the inner side of the adjusting gear ring assembly (26), and a lens correction ring (261) is fixedly installed on the outer side of the adjusting gear ring assembly (26).

7. An optical resonant cavity according to claim 6, characterized in that: The inner toothed ring assembly (26) has a lens correction ring (261) fixedly installed on one side. The inner surface of the lens correction ring (261) is evenly distributed with compression pads (2611). The inner surface of the compression pads (2611) is in contact with the outer surface of the lens fixing ring (23).

8. An optical resonant cavity according to claim 7, characterized in that: An indicator ring (27) is fixedly installed in the middle of the outer surface of the lens mounting outer cylinder (2). The adjusting gear ring assembly (26) is located on one side of the indicator ring (27). Elastic indicator push blocks (271) are evenly distributed inside the indicator ring (27). The inner side of the elastic indicator push block (271) is provided with a locking groove that matches the indicator arrow (262).

9. A 1200nm laser, comprising a laser mounting platform (3), wherein a pump source (5) is disposed on one side of the laser mounting platform (3), a filter element (6) is disposed at the output end of the pump source (5), and a control system assembly (4) is also disposed on one side of the upper surface of the laser mounting platform (3), characterized in that: The 1200nm laser also includes the optical resonant cavity described in claim 1.

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