A light collection module and a laser optical system

Abstract

This invention discloses a focusing module and a laser optical system. The focusing module is used to gather and / or focus excitation light to a wavelength conversion device. The excitation light has a beam quality product in the x-axis direction that is greater than the beam quality product in the y-axis direction. The focusing module includes a module support, a focusing support, and a focusing lens group. The focusing lens group includes a first lens with negative refractive power, a second lens with positive refractive power, and a third lens with positive refractive power, arranged sequentially. The module support has a first mounting cavity in which the first lens is disposed. The focusing support has a second mounting cavity in which the third lens is disposed. The focusing module can efficiently shape and focus asymmetrical excitation light, has a simple and compact structure, and exhibits excellent focusing effect.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and more specifically, to a focusing module and a laser optical system. Background Technology

[0002] Currently, most high-power laser modules on the market consist of an array structure composed of multiple lasers. However, the beam quality product of the laser array in the x and y directions is usually asymmetrical, resulting in non-uniformity of the emitted laser beam in the x and y directions and an elliptical beam shape, which affects the excitation efficiency of the laser for wavelength conversion devices. Furthermore, the current mainstream trend for laser source systems is towards miniaturization, portability, and simplified manufacturing processes. Therefore, how to reduce the size of the optical system, simplify the installation process, and improve mass production stability while ensuring excellent optical performance is a problem that engineers in this industry are committed to solving. Summary of the Invention

[0003] The present invention aims to overcome at least one of the defects of the prior art and provide a focusing module that can efficiently shape and focus asymmetrical excitation light, and has a simple and compact structure with excellent focusing effect.

[0004] Another object of the present invention is to provide a laser optical system with high light collection efficiency and excellent optical performance.

[0005] The technical solution adopted in this invention is:

[0006] A focusing module is provided for gathering and / or focusing excitation light to a wavelength conversion device. The product of the beam quality of the excitation light in the x-axis direction is greater than the beam quality in the y-axis direction. The focusing module includes a module support, a focusing support, and a focusing lens group. The focusing lens group includes a first lens with negative refractive power, a second lens with positive refractive power, and a third lens with positive refractive power arranged sequentially. The module support has a first mounting cavity in which the first lens is disposed. The focusing support has a second mounting cavity in which the third lens is disposed. The combined focal length of the focusing lens group in the x-axis direction is f1x, and the combined focal length of the focusing lens group in the y-axis direction is f1y. The distance from the incident surface of the first lens to the excitation surface of the wavelength conversion device is L1. L1, f1x, and f1y satisfy: 0.7 < L1 / f1x < 1.4; 1.1 < L1 / f1y < 1.7.

[0007] In one embodiment, the first mounting cavity is provided with a first step, the first lens is disposed on the first step, the second mounting cavity is provided with a second step, the third lens is disposed on the second step, and the second lens and the third lens group are spaced apart by a lens retaining ring.

[0008] In one embodiment, the first mounting cavity is further provided with a plurality of mounting slots, and a plurality of silicone spacers are disposed in the mounting slots, wherein the silicone spacers are located between the first lens and the second lens.

[0009] In one embodiment, the light-concentrating bracket is further provided with a third step, and a light-diffusing sheet is provided on the third step.

[0010] In one embodiment, the module bracket is provided with a positioning post or a positioning hole, and the focusing bracket is provided with a positioning hole that mates with the positioning post of the module bracket or a positioning post that mates with the positioning hole of the module bracket.

[0011] A laser optical system includes a laser source emitting excitation light, a focusing module, a wavelength conversion device for converting the excitation light into illumination light, a collimating module for collimating the illumination light, and an output lens group for emitting the illumination light. The focusing module, collimating module, and output lens group are arranged coaxially in sequence. The ratio of the beam quality product of the excitation light along the x-axis to the beam quality product along the y-axis is 1.1-2.

[0012] In one embodiment, the collimation module includes a collimation bracket and a collimation lens group disposed on the collimation bracket. The collimation lens group includes a fourth lens with positive refractive power and a fifth lens with positive refractive power. The effective aperture of the fourth lens is D4, and the gap between the fourth lens and the wavelength conversion device is L21. D4 and L21 satisfy: 13 <D4 / L21<17。

[0013] In one embodiment, the collimator is provided with an annular third mounting cavity, the third mounting cavity is provided with a chamfer, and the chamfer is provided with a plurality of adhesive grooves. The fourth lens is guided and installed in the third mounting cavity through the chamfer and installed by adhesive dispensing. And / or the collimator is provided with a fourth step, and the fifth lens is disposed on the fourth step.

[0014] In one embodiment, the collimator is provided with at least two support handles, and the side wall of the focusing bracket is provided with a guide mounting groove for guiding the installation of the support handles; or the focusing bracket is provided with at least two support handles, and the side wall of the collimator is provided with a guide mounting groove for guiding the installation of the support handles, and the collimator and the focusing bracket are connected by the support handles.

[0015] In one embodiment, the combined focal length of the collimating lens group is f2, and the farthest distance from the excitation surface of the wavelength conversion device to the light-emitting surface of the fifth lens is L2, wherein L2 and f2 satisfy: 0.42 < f2 / L2 < 0.65.

[0016] In one embodiment, the wavelength conversion device includes a sapphire fluorescent disk, a brushless motor that drives the sapphire fluorescent disk to rotate, and a metal ring disposed on the sapphire fluorescent disk to maintain dynamic balance.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the focusing module of the present invention, by designing the combined focal length of the focusing lens group in the x-axis and y-axis directions, can efficiently shape and focus asymmetrical excitation light to obtain a circular light spot with high energy density, thereby improving the overall excitation efficiency of the focusing module and thus improving the light flux and illuminance of the optical system. Attached Figure Description

[0018] Figure 1 This is an exploded view of the focusing module in Embodiment 1 of the present invention.

[0019] Figure 2 This is a structural diagram of the module support in Embodiment 1 of the present invention.

[0020] Figure 3 This is a structural diagram of the focusing bracket in Embodiment 1 of the present invention.

[0021] Figure 4 This is a structural diagram of the focusing bracket from another perspective in Embodiment 1 of the present invention.

[0022] Figure 5 This is an exploded view of the laser optical system of Embodiment 2 of the present invention.

[0023] Figure 6 This is an optical simulation diagram of the laser optical system in Embodiment 2 of the present invention.

[0024] Figure Descriptions: 10. Concentrating Module; 11. Module Support; 111. First Mounting Cavity; 1111. First Step; 1112. Mounting Groove; 112. Positioning Post; 113. Fourth Cavity; 12. Concentrating Support; 121. Second Mounting Cavity; 1211. Second Step; 1212. Third Step; 1213. Fourth Step; 122. Positioning Hole; 1221. Threaded Hole; 13. Concentrating Lens Group; 131. First Lens; 132. Second Lens; 133. Third Lens; 14. Lens Retention Ring; 15. Silicon 20. Glue spacer; 21. Collimation module; 22. Collimation bracket; 23. Third mounting cavity; 24. Chamfer; 25. Dispensing groove; 26. Fifth step; 27. Support handle; 28. Through hole; 29. ​​Collimating lens group; 20. Fourth lens; 21. Fifth lens; 22. Excitation light source; 30. Wavelength conversion device; 41. Sapphire fluorescent color disk; 42. Brushless motor; 43. Metal ring; 50. Light emission module; 51. Light emission bracket; 52. Light emission lens; 60. Copper substrate; 70. Housing. Detailed Implementation

[0025] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate the following embodiments, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] The x-axis and y-axis directions described in this invention are two mutually perpendicular directions as conventionally understood. The beam quality product of the excitation light is greatest in the x-axis direction, and both the x-axis and y-axis directions are perpendicular to the optical axis (z-axis) of the condenser lens group.

[0027] Example 1

[0028] like Figure 1 , Figure 2 , Figure 3As shown, a focusing module 10 is used to gather and / or focus excitation light to a wavelength conversion device. The excitation light has a beam quality product in the x-axis direction that is greater than the beam quality product in the y-axis direction. The focusing module includes a module support 11, a focusing support 12, and a focusing lens group 13. The focusing lens group 13 includes a first lens 131 with negative refractive power, a second lens 132 with positive refractive power, and a third lens 133 with positive refractive power, arranged sequentially. The module support 11 is provided with a first mounting cavity 111, and the first lens 131 is provided with... The first mounting cavity 111 is placed inside the condenser bracket 12, which has a second mounting cavity 121. The third lens 133 is disposed inside the second mounting cavity 121. The combined focal length of the condenser lens group 13 in the x-axis direction is f1x, and the combined focal length of the condenser lens group in the y-axis direction is f1y. The distance from the incident surface of the first lens 131 to the excitation surface of the wavelength conversion device is L1. L1, f1x, and f1y satisfy: 0.7 < L1 / f1x < 1.4; 1.1 < L1 / f1y < 1.7.

[0029] Furthermore, in this embodiment, the ratio of the beam quality product of the excitation light in the x-axis direction to the beam quality product in the y-axis direction is 1.1-2.

[0030] Furthermore, in this embodiment, 0.79≤L1 / f1x≤1.24; 1.4≤L1 / f1y≤1.5.

[0031] Further, in this embodiment, L1 = 16.5 mm, f1x = 13.3 mm, and f1y = 11.7 mm. In other embodiments, L1 can be 18.9 mm, f1x = 23.8 mm, and f1y = 13.2 mm. In other embodiments, L1 can also be 21.8 mm, f1x = 23.7 mm, and f1y = 15.5 mm.

[0032] This embodiment employs a condenser lens assembly with specific structure and optical parameters, and mounts and fixes the condenser lens assembly using a module bracket and a condenser bracket. This allows for quick and stable installation of the condenser lens assembly, resulting in a simpler structure and manufacturing process, higher precision, and suitability for stable production. By controlling the combined focal length of the condenser lens assembly in the x-axis direction, the combined focal length in the y-axis direction, and the distance from the incident surface of the first lens to the excitation surface of the wavelength conversion device, the condenser lens assembly can shape and focus the excitation beam while maintaining a compact overall structure of the condenser module and minimizing imaging differences in the imaging optical system of the condenser module.

[0033] Furthermore, in this embodiment, the first mounting cavity 111 is provided with a first step 1111, and the first lens 131 is disposed on the first step 1111. The second mounting cavity 121 is provided with a second step 1211, and the third lens 133 is disposed on the second step 1211. The second lens 132 and the third lens 133 are spaced apart by a lens retaining ring 14. In this embodiment, by setting the first lens 131 and the third lens 133 on the steps of the module bracket 11 and the condenser lens 12 respectively, and then using the lens retaining ring 14 to space between the second lens 132 and the third lens 133, the condenser lens group 13 can be quickly and easily installed and fixed. The installation of the entire condenser lens group 13 does not require the use of glue, screws, or other methods for fixing, which greatly simplifies the process while ensuring the positional accuracy of each lens.

[0034] Furthermore, in this embodiment, the first mounting cavity 111 is further provided with a plurality of mounting grooves 1112, and a plurality of silicone spacers 15 are disposed in the mounting grooves 1112, and the silicone spacers 15 are located between the first lens 131 and the second lens 132. Furthermore, in this embodiment, the number of mounting grooves 1112 and silicone spacers 15 is two each. The silicone spacers 15 can, on the one hand, press the first lens 131 tightly, and on the other hand, elastically separate the first lens 131 and the second lens 132.

[0035] Furthermore, in this embodiment, the focusing bracket 12 is further provided with a third step 1212, on which a light-diffusing sheet 80 is provided. The light-diffusing sheet 80 can homogenize the excitation light, making the light spot irradiated to the wavelength conversion device uniform and avoiding the burning of powder in the wavelength conversion device. Furthermore, the focusing bracket 12 may also be provided with a fourth step 1213, which is also used to place the light-diffusing sheet in another position. By setting multiple steps, the position of the light-diffusing sheet can be adjusted according to actual needs, thereby adjusting the size of the homogenized light spot and thus achieving the purpose of adjusting luminous flux and illuminance. It is worth mentioning that, in order to prevent the installation space of the light-diffusing sheet from being limited by the steps, the light-diffusing sheet is preferably set as a strip or ellipse, so that it can be installed on different steps by changing the position of the long and short sides and the long and short axes of the light-diffusing sheet.

[0036] Furthermore, in this embodiment, the module bracket 11 is provided with positioning posts or positioning holes, and the focusing bracket is provided with positioning holes that mate with the positioning posts of the module bracket or positioning posts that mate with the positioning holes of the module bracket. The positioning posts or positioning holes are used to pre-fix the relative positions of the module bracket and the focusing bracket. Figure 2 , Figure 3As shown in the figure, in this embodiment 1, the module bracket 11 is provided with a positioning post 112 as an example. The position of the focusing bracket 12 corresponding to the positioning post 112 is provided with a positioning hole 122. When installing the focusing module, the positioning post can be inserted into the positioning hole 122 to achieve the pre-fixation function, which facilitates the subsequent operation of other fastening module brackets and focusing brackets.

[0037] Furthermore, the module bracket and the focusing bracket are provided with through holes or threaded holes. The module bracket and the focusing bracket are fastened together by screws or bolts engaging with the through holes or threaded holes, thereby achieving a secure installation of the module bracket, the focusing bracket, and the light-transmitting lens group.

[0038] Furthermore, in this embodiment, the first lens 131 is a cylindrical lens, the combined focal length of the first lens group in the x-axis direction is f1x, and the combined focal length in the y-axis direction is f1y. The f1x and fly satisfy: 1.14≤f1x / fly≤1.8.

[0039] Furthermore, the first lens has at least one concave surface in the x-axis direction, and the focal length of the first lens in the x-axis direction is f11x, wherein f11x and flx satisfy: 1≤|f11x| / flx≤8.

[0040] Furthermore, in this embodiment, the light-incident surface of the second lens is convex with a radius of curvature of R21, and the light-outceasing surface is planar; the effective aperture of the second lens is D2, and the focal length of the second lens is f12. R21 and D2 satisfy: 1.0≤|R21| / D2≤1.5, f12>|f1y|.

[0041] Furthermore, in this embodiment, the third lens is an aspherical lens with a convex incident surface and a radius of curvature of R31, and an aspherical exit surface with an approximately spherical radius of curvature of R32. The effective aperture of the third lens is D3, and the focal length of the third lens is f13. R31, R32, D3, and f13 satisfy: |R31|*1.2<|R32|<|R31|*2, 0.45≤|R31| / D3≤0.82, and f13>|f1y|.

[0042] Furthermore, the center thickness of the second lens is T2, and T2 satisfies: 6 < |R21| / T2 < 11.

[0043] Example 2

[0044] like Figure 5As shown in the figure, a laser optical system includes a laser light source 30 that emits excitation light, a condenser module 10 described in Embodiment 1, a wavelength conversion device 40 for converting the excitation light into illumination light, a collimation module 20 for collimating the illumination light, and a light-emitting lens group 50 for emitting the illumination light. The condenser module 10, the collimation module 20, and the light-emitting lens group 50 are coaxially arranged in sequence. The beam quality product of the excitation light source 30 in the x-axis direction is greater than the beam quality product in the y-axis direction.

[0045] The optical system described in this embodiment can perform optical shaping on the excitation light with different beam quality products in the x and y directions to obtain a circular spot with a good focusing effect, so that the energy density of the spot focused on the wavelength conversion device is high and the excitation efficiency is high.

[0046] Further, the collimation module 20 includes a collimation bracket 21 and a collimation lens group 22 provided on the collimation bracket 21. The collimation lens group 22 includes a fourth lens 221 with a positive diopter and a fifth lens 222 with a positive diopter. The effective clear aperture of the fourth lens 221 is D4, and the gap distance between the fourth lens 221 and the wavelength conversion device 30 is L21. The D4 and L21 satisfy: 13 < D4 / L21 < 17. Further, 14 ≤ D4 / L21 ≤ 15.

[0047] Further, in this embodiment, the ratio of the beam quality product of the excitation light in the x-axis direction to the beam quality product in the y-axis direction is 1.1 - 2.

[0048] Specifically, in this embodiment, L21 = 1.3 mm and D4 = 19.5 mm. In other embodiments, it can be L21 = 1.5 mm and D4 = 21 mm. In other embodiments, it can also be L21 = 1.74 mm and D4 = 24.4 mm. By controlling the distance between the fourth lens in the second lens group and the wavelength conversion device and the effective clear aperture of the fourth lens, the numerical aperture of the second lens group 22 is increased as much as possible, so that the light collection rate of the second lens group 22 is high, thereby effectively improving the overall light collection efficiency of the optical system.

[0049] Further, the collimation bracket 21 is provided with an annular third installation cavity 211. The third installation cavity 211 is provided with a chamfer 2111, and several glue dispensing grooves 2112 are provided on the chamfer. The fourth lens 221 is installed in the third installation cavity 211 through chamfer guidance and by glue dispensing, and / or the collimation bracket 21 is provided with a fifth step 2113, and the fifth lens is arranged on the fifth step 2113.

[0050] Further, as Figure 4 、 Figure 5In this embodiment, the collimator 21 is provided with at least two support handles 212, and the side wall of the focusing bracket 12 is provided with a guide mounting groove 122 for guiding the installation of the support handles 212. The collimator 21 and the focusing bracket 12 are connected through the support handles 212. In other embodiments, the focusing bracket may also be provided with at least two support handles, and the side wall of the collimator may be provided with a guide mounting groove for guiding the installation of the support handles.

[0051] Furthermore, the support handle 212 is provided with a through hole 2121, and the side wall of the focusing bracket 12 is provided with a threaded hole 1221. The support handle is fixed to the focusing bracket by screws passing through the through hole 2121 and the threaded hole 1221.

[0052] Further, the combined focal length of the collimating lens group is f2, and the farthest distance from the excitation surface of the wavelength conversion device 40 to the light-emitting surface of the fifth lens is L2. L2 and f2 satisfy: 0.42 < f2 / L2 < 0.65. Further, 0.52 ≤ f2 / L2 ≤ 0.54. More specifically, in this embodiment, f2 = 8.9 mm and L2 = 16.58 mm; in other embodiments, f2 can be 10.1 mm and L2 = 19.1 mm; in other embodiments, f2 can be 11.6 mm and L2 = 21.9 mm.

[0053] Furthermore, the wavelength conversion device 40 includes a sapphire fluorescent color disk 41, a brushless motor 42 for driving the sapphire fluorescent color disk 41 to rotate, and a metal ring 43 disposed on the sapphire fluorescent color disk to maintain dynamic balance. Further, as... Figure 3 As shown, the module bracket 11 is also provided with a fourth cavity 113 spaced apart from the first mounting cavity 111, and the brushless motor 42 is partially housed in the fourth cavity 113. The fourth cavity 113 can be used to partially house the brushless motor of the wavelength conversion device, keeping the overall structure of the lighting system compact and ensuring that the spacing between the lens group and the wavelength conversion device meets the optical design requirements. Furthermore, the sapphire color disk 41 is coated with a fluorescent layer 411, and the sapphire color disk 41 is also provided with an anti-reflective film and a yellow-to-blue translucent film (not shown in the figure). Furthermore, the copper ring of the wavelength conversion device 40 is located near the center of the sapphire color disk 41 and is fixed to the sapphire color disk by dispensing adhesive. The reason for using a copper ring is that copper has a high density and, compared to aluminum, has a greater weight for the same volume. The copper ring itself has a certain weight and area, which helps stabilize the rotation of the color wheel. Furthermore, when the color wheel is unbalanced, adhesive can be applied to the lighter areas of the copper ring, or holes can be drilled or cut into the heavier areas to balance the color wheel. Overall, the copper ring plays a role in maintaining dynamic balance. In addition, the copper ring is made of metal, which has good thermal conductivity, thus improving the heat dissipation of the wavelength conversion device.

[0054] Furthermore, the light-emitting lens group 50 includes a light-emitting bracket 51 and a light-emitting lens 52. The light-emitting bracket 51 and the collimating bracket 21 are assembled by threaded engagement, that is, the collimating bracket 21 is provided with a first thread, and the light-emitting bracket 51 is provided with a second thread that engages with the first thread.

[0055] Furthermore, the laser optical system described in this embodiment also includes a copper substrate 60 and a housing 70. The laser light source 30 is disposed on the copper substrate, and the housing 70 is used to encapsulate the entire laser optical system. Furthermore, a sealing silicone gasket 90 is provided between the copper substrate 60 and the housing 70, which serves to more securely seal the entire laser optical system.

[0056] Furthermore, the fourth lens 21 is a plano-convex lens with positive refractive power. Its light-receiving surface facing the wavelength conversion device 30 is flat, and its light-emitting surface facing away from the wavelength conversion device is convex with a radius of curvature of R42. The effective aperture of the fourth lens is D4, and R42 and D4 satisfy: 0.38≤|R42| / D4≤0.65; the focal length of the fourth lens is f21, 0.46<f2 / f21<0.7, 1.32≤f21 / |R42|≤1.75.

[0057] The fifth lens is a plano-convex aspherical lens with positive refractive power. Its light-receiving surface facing the wavelength conversion device is a plane, and its light-emitting surface facing away from the wavelength conversion device is a convex aspherical surface with an approximate spherical radius of curvature of R52. The effective aperture of the fifth lens is D5, and R52 and D5 satisfy: 0.28≤|R52| / D5≤0.62; the focal length of the fifth lens is f22, 0.4<f2 / f22<0.85, 1.35≤f22 / |R52|≤1.82.

[0058] Furthermore, the center thickness of the fourth lens is T4, and T4 satisfies: 1.1 < |R42| / T4 < 1.6.

[0059] The optical simulation diagram of the laser optical system described in this embodiment is as follows: Figure 6 As shown (simulated distance is 20m), from Figure 6 As can be seen, the optical system described in this embodiment ultimately produces a circular light spot effect, with a maximum central illuminance of 8.32 × 10⁻⁶. 4 lux.

[0060] Furthermore, the laser optical system described in this embodiment also includes a detection element disposed in the optical path of the illumination light for monitoring the laser illumination signal. Specifically, it can be a blue light monitoring PD device (not shown in the figure). The blue light monitoring PD device monitors the illuminance or intensity of blue light in the illumination light, thereby detecting whether there is blue light leakage in the laser optical system and improving the safety performance of the laser optical system.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A focusing module for gathering and / or focusing excitation light to a wavelength conversion device, wherein the beam quality product of the excitation light in the x-axis direction is greater than the beam quality product in the y-axis direction, characterized in that, The focusing module includes a module bracket, a focusing bracket, and a focusing lens group. The focusing lens group includes a first lens with negative refractive power, a second lens with positive refractive power, and a third lens with positive refractive power arranged sequentially. The module bracket has a first mounting cavity, in which the first lens is disposed. The focusing bracket has a second mounting cavity, in which the third lens is disposed. The combined focal length of the focusing lens group in the x-axis direction is f1x, and the combined focal length of the focusing lens group in the y-axis direction is f1y. The distance from the incident surface of the first lens to the excited surface of the wavelength conversion device is L1. L1, f1x, and f1y satisfy: 0.7 < L1 / f1x < 1.4; 1.1 < L1 / f1y < 1.

7.

2. The focusing module according to claim 1, characterized in that, The first mounting cavity has a first step, and the first lens is disposed on the first step. The second mounting cavity has a second step, and the third lens is disposed on the second step. The second lens and the third lens group are separated by a lens retaining ring.

3. The focusing module according to claim 2, characterized in that, The first mounting cavity is further provided with a plurality of mounting slots, and a plurality of silicone spacers are disposed in the mounting slots, with the silicone spacers located between the first lens and the second lens.

4. The focusing module according to claim 1, characterized in that, The light-concentrating bracket is further provided with a third step, and a light-diffusing sheet is provided on the third step.

5. The focusing module according to claim 1, characterized in that, The module bracket is provided with positioning posts or positioning holes, and the focusing bracket is provided with positioning holes that cooperate with the positioning posts of the module bracket or positioning posts that cooperate with the positioning holes of the module bracket.

6. A laser optical system, characterized in that, The device includes a laser source emitting excitation light, a focusing module as described in any one of claims 1 to 5, a wavelength conversion device for converting the excitation light into illumination light, a collimating module for collimating the illumination light, and an emitting lens group for emitting the illumination light. The focusing module, collimating module, and emitting lens group are arranged coaxially in sequence, and the ratio of the beam quality product of the excitation light in the x-axis to the beam quality product in the y-axis is 1.1-2.

7. The laser optical system according to claim 6, characterized in that, The collimation module includes a collimation bracket and a collimation lens group mounted on the collimation bracket. The collimation lens group includes a fourth lens with positive refractive power and a fifth lens with positive refractive power. The effective aperture of the fourth lens is D4, and the gap between the fourth lens and the wavelength conversion device is L21. D4 and L21 satisfy: 13 <D4 / L21<17。 8. The laser optical system according to claim 7, characterized in that, The collimating bracket has an annular third mounting cavity, the third mounting cavity has a chamfer, and the chamfer has several adhesive grooves. The fourth lens is guided and installed in the third mounting cavity through the chamfer and installed by adhesive dispensing. And / or the collimating bracket has a fourth step, and the fifth lens is disposed on the fourth step.

9. The laser optical system according to claim 7, characterized in that, The collimator is provided with at least two support handles, and the side wall of the focusing bracket is provided with a guide mounting groove for guiding the installation of the support handles; or the focusing bracket is provided with at least two support handles, and the side wall of the collimator is provided with a guide mounting groove for guiding the installation of the support handles; the collimator and the focusing bracket are connected by the support handles.

10. The laser optical system according to claim 7, characterized in that, The combined focal length of the collimating lens group is f2, and the farthest distance from the excitation surface of the wavelength conversion device to the light-emitting surface of the fifth lens is L2. L2 and f2 satisfy: 0.42 < f2 / L2 < 0.

65.

11. The laser optical system according to claim 6, characterized in that, The wavelength conversion device includes a sapphire fluorescent disk, a brushless motor that drives the sapphire fluorescent disk to rotate, and a metal ring disposed on the sapphire fluorescent disk to maintain dynamic balance.

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