A self-frequency-doubled yellow laser

Abstract

This utility model relates to the field of laser technology and discloses a self-frequency-doubled yellow laser, including a pump source, a fiber fast-axis compression module, a coupling lens module, and a laser crystal module. The fiber fast-axis compression module is disposed in the optical path of the laser output from the pump source to compress the fast-axis divergence angle of the laser beam output from the pump source. The coupling lens module is disposed in the output optical path after shaping by the fiber fast-axis compression module to focus the beam onto the laser crystal module, which is a self-frequency-doubled crystal module. The pump source, fiber fast-axis compression module, coupling lens module, and laser crystal module are connected by a mechanical fixing structure. The laser output from the pump source is first shaped by the fiber fast-axis compression module to reduce the fast-axis divergence angle, and then focused into the laser crystal module by the coupling lens module. The modules are connected by optical lenses and mechanical fixing structures to ensure optical path stability and alignment accuracy.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, specifically to pump coupling technology and laser generation, and particularly to a self-frequency-doubled yellow light laser. Background Technology

[0002] Self-frequency-doubled yellow light lasers, due to their compact structure and efficient frequency conversion characteristics, have broad application prospects in fields such as medical aesthetics, laser display, and spectral analysis. Currently, technologies for achieving yellow light laser output mainly include nonlinear optical frequency conversion and optically pumped semiconductor lasers. However, nonlinear optical frequency conversion systems are complex and inefficient, while semiconductor lasers that directly emit yellow light have limited output power and stability. Therefore, developing a yellow light laser module that combines high efficiency and stability has become a current technological hotspot.

[0003] In existing technologies, common pump coupling methods include direct coupling, lens coupling, and fiber coupling. Direct coupling is simple but inefficient; lens coupling has higher efficiency but requires strict alignment accuracy and has poor stability; fiber coupling has good stability but its efficiency is limited by the fiber's own loss. Furthermore, existing technologies often employ a single coupling method, making it difficult to simultaneously meet the requirements of high efficiency and stability.

[0004] Existing pump coupling technologies cannot simultaneously achieve high coupling efficiency and stability, thus limiting the overall performance of laser modules. Specifically, direct coupling has low efficiency; lens coupling is difficult to align and is susceptible to environmental vibrations; and fiber coupling efficiency is limited by fiber loss and is costly. Therefore, improving the stability of pump coupling without sacrificing coupling efficiency, thereby achieving efficient and stable output from self-frequency-doubled yellow light laser modules, has become one of the urgent problems to be solved. Utility Model Content

[0005] To improve the stability of pump coupling without sacrificing coupling efficiency, thereby achieving efficient and stable output of a self-frequency-doubled yellow light laser module, this invention proposes a self-frequency-doubled yellow light laser. It employs a modular design combined with beam shaping technology to optimize the transmission and focusing process of the pump light. The laser output from the pump source first undergoes beam shaping via a fiber fast-axis compression module to reduce the fast-axis divergence angle, and then is focused into the laser crystal module via a coupling lens module. The modules are connected by optical lenses and mechanical fixing structures to ensure optical path stability and alignment accuracy.

[0006] To achieve the above objectives, this utility model provides the following technical solution: To achieve the above objectives, this utility model provides a self-frequency-doubled yellow laser, comprising a pump source, a fiber fast-axis compression module, a coupling lens module, and a laser crystal module. The fiber fast-axis compression module is disposed on the optical path of the laser output from the pump source to compress the fast-axis divergence angle of the laser beam output from the pump source. The coupling lens module is disposed on the output optical path after being shaped by the fiber fast-axis compression module to focus the beam onto the laser crystal module, which is a self-frequency-doubled crystal module. The pump source, fiber fast-axis compression module, coupling lens module, and laser crystal module are connected by a mechanical fixing structure.

[0007] Furthermore, the optical fiber fast axis compression module uses multimode fiber for beam shaping, and the multimode fiber has a core diameter of 100μm and a numerical aperture of 0.22.

[0008] Furthermore, the coupling lens module consists of a pair of aspherical lenses with focal lengths of 10mm and 20mm, respectively, used to focus the shaped beam onto the laser crystal module.

[0009] Furthermore, the self-frequency doubling crystal module uses neodymium-doped yttrium vanadate (Nd:YVO4) crystal, with a physical length of 2mm along the laser beam propagation direction. When the laser is focused into the self-frequency doubling crystal module by the coupling lens module, it is used to generate yellow laser output through the self-frequency doubling effect.

[0010] Furthermore, the coupling lens module is positioned between the fiber fast axis compression module and the laser crystal module, and when the position of the coupling lens module is adjusted so that the spot of the focused beam falls on the center of the self-frequency doubling crystal module, the relative positions of the pump source, the fiber fast axis compression module, the coupling lens module, and the laser crystal module are fixed.

[0011] Furthermore, the coupling lens module employs a combination of spherical lenses or aspherical lenses.

[0012] Furthermore, the mechanical fixing structure is a stacked or layered structure, which uses low-expansion-coefficient optical adhesive to bond optical lenses, thereby achieving rigid connection and alignment of the pump source, fiber fast axis compression module, coupling lens module and laser crystal module.

[0013] Furthermore, the fiber fast axis compression module is replaced by a free space beam shaping device, which achieves fast axis compression of the beam through a combination of prisms or mirrors, thus replacing the fiber fast axis compression module.

[0014] Furthermore, the coupling lens module is an orthogonal coupling lens, which simultaneously realizes the fast-axis compression and focusing functions of the beam to simplify the system structure.

[0015] Furthermore, the pump source is a semiconductor laser, and the output wavelength can be adjusted according to the material properties of the laser crystal module. The resulting self-frequency-doubled yellow laser can be used in laser design and solid-state laser pump coupling scenarios. It has high coupling efficiency and vibration resistance stability. The system can adapt to different laser crystal materials by adjusting the spacing of optical components to control the beam size and power density and avoid exceeding the damage threshold of the crystal material.

[0016] Compared with existing technologies, the self-frequency-doubled yellow light laser proposed in this invention has the following significant advantages: This invention relates to a self-frequency-doubled yellow laser. The laser output from the pump source is first shaped by a fiber fast-axis compression module to reduce the fast-axis divergence angle, and then focused into the laser crystal module by a coupling lens module. By utilizing the synergistic effect of the fiber fast-axis compression module and the coupling lens module, a significant improvement in pump coupling efficiency is achieved. The fiber fast-axis compression module effectively reduces the divergence angle of the semiconductor laser's fast axis and eliminates the asymmetry between the fast and slow axes. The coupling lens module uses a combination of aspherical lenses with a specific focal length to ensure efficient focusing of the beam onto the laser crystal. The modules work in optimal coordination, effectively solving the problems of low direct coupling efficiency and difficult lens coupling alignment in existing pump coupling technologies. This invention reduces system complexity while maintaining high transmission efficiency.

[0017] These or other aspects of this application will become more apparent from the following description of embodiments. It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the accompanying drawings used in the description of the exemplary embodiments or related technologies will be briefly introduced below. The drawings are used to provide a further understanding of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain this utility model and do not constitute a limitation on this utility model. In the drawings: Figure 1 This is a structural diagram of a self-frequency-doubled yellow light laser according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the installation of a mechanical fixing structure in a self-frequency doubling yellow laser according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of a mechanically fixed structure in a self-frequency doubling yellow laser according to an embodiment of the present invention.

[0021] Figure 4This is a schematic diagram of the coupling lens module in a self-frequency doubling yellow laser according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of a prism assembly used in a self-frequency-doubled yellow light laser according to an embodiment of the present invention, when a free-space beam is employed.

[0023] Figure label: 1-Pump source, 2-Fiber fast axis compression module, 3-Coupled lens module, 4-Laser crystal module, 5-Mechanical fixing structure, 6-Prism. Detailed Implementation

[0024] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model are further described in detail below with reference to specific examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit this application.

[0026] It should be noted that all uses of the terms "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two different entities or different parameters with the same name. Therefore, "first" and "second" are merely for convenience of expression and should not be construed as limiting the embodiments of this utility model. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as other steps or units inherent in a process, method, system, product, or device that includes a series of steps or units.

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0029] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] See Figure 1 and Figure 2 As shown, an embodiment of this utility model provides a self-frequency-doubled yellow laser, including a pump source 1, a fiber fast-axis compression module 2, a coupling lens module 3, and a laser crystal module 4. The fiber fast-axis compression module 2 is disposed on the optical path of the laser output from the pump source 1 and is used to compress the fast-axis divergence angle of the laser beam output from the pump source 1. The coupling lens module 3 is disposed on the output optical path after being shaped by the fiber fast-axis compression module 2 and is used to focus the beam onto the laser crystal module 4. The laser crystal module 4 is a self-frequency-doubled crystal module. The pump source 1, the fiber fast-axis compression module 2, the coupling lens module 3, and the laser crystal module 4 are connected by a mechanical fixing structure 5.

[0031] In this embodiment, the pump source 1 is a semiconductor laser, and its output wavelength can be adjusted according to the material properties of the laser crystal module 4. The fiber fast axis compression module 2 uses multimode fiber for beam shaping, and the multimode fiber has a core diameter of 100 μm and a numerical aperture of 0.22. The coupling lens module 3 consists of a pair of aspherical lenses with focal lengths of 10 mm and 20 mm, respectively, used to focus the shaped beam onto the laser crystal module 4. The laser crystal module 4 is a self-frequency doubling crystal module, which uses neodymium-doped yttrium vanadate (Nd:YVO4) crystal with a physical length of 2 mm along the laser beam propagation direction. When the laser is focused into the self-frequency doubling crystal module by the coupling lens module 3, it generates yellow laser output through the self-frequency doubling effect. The synergistic effect of the fiber fast axis compression module and the coupling lens module 3 improves both coupling efficiency and system stability.

[0032] The laser output from pump source 1 is first beam shaped by a fiber fast-axis compression module to reduce the fast-axis divergence angle, and then focused into laser crystal module 4 by coupling lens module 3. Pump source 1, fiber fast-axis compression module 2, coupling lens module 3, and laser crystal module 4 are connected by optical lenses and mechanical fixing structures to ensure optical path stability and alignment accuracy. The resulting self-frequency-doubled yellow laser can be used in laser design and solid-state laser pump coupling scenarios, featuring high coupling efficiency and vibration resistance. The system can be adapted to different laser crystal materials by adjusting the spacing of optical components to control beam size and power density, avoiding exceeding the damage threshold of the crystal material.

[0033] In this embodiment, see Figures 1 to 4 As shown, the coupling lens module 3 is disposed between the fiber fast axis compression module 2 and the laser crystal module 4, and when the position of the coupling lens module 3 is adjusted so that the spot of the focused beam falls on the center of the self-frequency doubling crystal module, the relative positions of the pump source 1, the fiber fast axis compression module 2, the coupling lens module 3 and the laser crystal module 4 are fixed.

[0034] In some embodiments, the fiber fast axis compression module may also use multimode fibers with different core diameters and numerical apertures; the coupling lens module 3 may use a combination of spherical lenses or aspherical lenses; the self-frequency doubling crystal module may use other neodymium-doped crystals (such as Nd:YAG).

[0035] In this embodiment, see Figure 2 and Figure 3 As shown, the mechanical fixing structure 5 is a stacked or layered structure. It uses low-expansion-coefficient optical adhesive to bond optical lenses, thereby achieving rigid connection and alignment of the pump source 1, the fiber fast axis compression module 2, the coupling lens module 3, and the laser crystal module 4.

[0036] In some embodiments, the fiber fast-axis compression module 2 is replaced by a free-space beam shaping device. This free-space beam shaping device achieves fast-axis compression of the beam through a combination of prisms 6 and mirrors, and then focuses the beam onto the laser crystal via a coupling lens. Replacing the fiber fast-axis compression module with this device can eliminate the difference in fast and slow axis output characteristics of the semiconductor pump source through free-space means, such as... Figure 5 The prism 6 pairs equally reduce the difference between the fast and slow axes.

[0037] In some embodiments, the coupling lens module 3 is an orthogonal coupling lens, which simultaneously realizes the fast-axis compression and focusing functions of the beam to simplify the system structure.

[0038] This invention significantly improves pump coupling efficiency through the synergistic effect of fiber fast axis compression and coupling lens; the introduction of the fiber fast axis compression module enhances the system's vibration resistance and improves coupling stability; the overall structure is compact, easy to integrate, and suitable for various application scenarios.

[0039] This invention relates to a self-frequency-doubled yellow laser. The laser output from pump source 1 is first shaped by a fiber fast-axis compression module to reduce the fast-axis divergence angle, and then focused into laser crystal module 4 by coupling lens module 3. By utilizing the synergistic effect of the fiber fast-axis compression module and coupling lens module 3, a significant improvement in pump coupling efficiency is achieved. The fiber fast-axis compression module effectively reduces the divergence angle of the semiconductor laser's fast axis and eliminates the asymmetry between the fast and slow axes. The coupling lens module 3 uses a combination of aspherical lenses with a specific focal length to ensure efficient focusing of the beam onto the laser crystal. The modules form an optimal combination, which can effectively solve the problems of low direct coupling efficiency and difficult lens coupling alignment in existing pump coupling technologies. This invention reduces system complexity while maintaining high transmission efficiency.

[0040] The above are exemplary embodiments disclosed in this utility model. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this utility model as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this utility model may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0041] It should be understood that, as used herein, the singular form "a" is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations of one or more of the associatedly listed items. The embodiment numbers disclosed above are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0042] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-frequency-doubled yellow light laser, characterized in that, The system includes a pump source (1), a fiber fast axis compression module (2), a coupling lens module (3), and a laser crystal module (4). The fiber fast axis compression module (2) is located on the optical path of the laser output from the pump source (1) and is used to compress the fast axis divergence angle of the laser beam output from the pump source (1). The coupling lens module (3) is located on the output optical path after the fiber fast axis compression module (2) is shaped and is used to focus the beam onto the laser crystal module (4). The laser crystal module (4) is a self-frequency doubling crystal module. The pump source (1), the fiber fast axis compression module (2), the coupling lens module (3), and the laser crystal module (4) are connected by a mechanical fixing structure (5).

2. The self-frequency-doubled yellow laser as described in claim 1, characterized in that, The fiber fast axis compression module (2) uses multimode fiber for beam shaping. The core diameter of the multimode fiber is 100μm and the numerical aperture is 0.

22.

3. The self-frequency-doubled yellow laser as described in claim 2, characterized in that, The coupling lens module (3) consists of a pair of aspherical lenses with focal lengths of 10mm and 20mm, respectively, used to focus the shaped beam onto the laser crystal module (4).

4. The self-frequency-doubled yellow laser as described in claim 3, characterized in that, The self-frequency doubling crystal module uses neodymium-doped yttrium vanadate crystal, and the physical length of the crystal along the direction of laser beam propagation is 2 mm. When the laser is focused into the self-frequency doubling crystal module by the coupling lens module (3), it is used to generate yellow laser output through the self-frequency doubling effect.

5. The self-frequency-doubled yellow laser as described in claim 4, characterized in that, The coupling lens module (3) is positioned between the fiber fast axis compression module (2) and the laser crystal module (4). When the position of the coupling lens module (3) is adjusted so that the spot of the focused beam falls on the center of the self-frequency doubling crystal module, the relative positions of the pump source (1), the fiber fast axis compression module (2), the coupling lens module (3) and the laser crystal module (4) are fixed.

6. The self-frequency-doubled yellow laser as described in claim 2, characterized in that, The coupling lens module (3) uses a combination of spherical lenses or aspherical lenses.

7. The self-frequency-doubled yellow laser as described in claim 1, characterized in that, The mechanical fixing structure (5) is a stacked or layered structural component, and optical lenses are bonded together with optical adhesive with a low coefficient of expansion.

8. The self-frequency-doubled yellow laser as described in claim 1, characterized in that, The fiber fast axis compression module (2) is replaced by a free space beam shaping device, which achieves beam fast axis compression through a combination of prisms (6) or mirrors, replacing the fiber fast axis compression module.

9. The self-frequency-doubled yellow laser as described in claim 2, characterized in that, The coupling lens module (3) is an orthogonal coupling lens that simultaneously realizes the fast axis compression and focusing functions of the beam.

10. The self-frequency-doubled yellow laser as described in claim 1, characterized in that, The pump source is a semiconductor laser.

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