CN217561852U - Light-gathering module and laser optical system - Google Patents

Abstract

The utility model discloses a spotlight module and laser optical system, spotlight module is used for drawing in and/or focusing on exciting light to wavelength conversion equipment, the exciting light is greater than the light beam quality product at y axle direction at the light beam quality product of x axle direction, spotlight module includes module support, spotlight support and spotlight lens group, spotlight lens group is including the first lens that has negative diopter, the second lens that has positive diopter and the third lens that has positive diopter that set gradually, the module support is equipped with first installation cavity, first lens set up in the first installation cavity, the spotlight support is equipped with second installation cavity, the third lens set up in the second installation cavity. The light-gathering module can efficiently shape and focus the asymmetrical exciting light, and has a simple and compact structure and an excellent light-gathering effect.

Description

Light-gathering module and laser optical system

Technical Field

The utility model relates to a laser technical field, more specifically relates to a spotlight module and laser optical system.

Background

At present, most of high-power laser modules on the market are of an array structure spliced by a plurality of lasers, however, the beam quality product of the laser array in the x and y directions is usually asymmetric, so that emitted laser is not uniform in the xy direction, and light spots are in an elliptical shape, so that the excitation efficiency of the laser on a wavelength conversion device is influenced. In addition, the main trend of laser light source systems is to make the laser light source systems smaller, lighter, and simpler in processing technology. Therefore, how to reduce the size of the optical system and simplify the installation process while ensuring the excellent optical effect of the laser optical system, and improve the stability of mass production is a problem that the technicians in the industry are dedicated to solve.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at overcoming above-mentioned prior art's at least one defect, provide a spotlight module, spotlight module can carry out high-efficient plastic focus, and simple structure is compact to asymmetric exciting light, and the spotlight effect is excellent.

Another object of the present invention is to provide a laser optical system, which has high light receiving efficiency and excellent optical performance.

The utility model adopts the technical proposal that:

the utility model provides a spotlight module for draw in and/or focus exciting light to wavelength conversion device, the beam quality product of exciting light in the x axle direction is greater than the beam quality in the y axle direction, spotlight module includes module support, spotlight support and spotlight lens group, spotlight lens group is including the first lens that has negative diopter, the second lens that has positive diopter and the third lens that has positive diopter that sets gradually, the module support is equipped with first installation cavity, first lens set up in first installation cavity, the spotlight support is equipped with second installation cavity, the third lens set up in the second installation cavity, spotlight lens group's combination focus in the x axle direction is f1x, spotlight lens group's combination focus in the y axle direction is f1y, the income plain noodles of first lens is L1 to the distance of wavelength conversion device's stimulated emission face, L1, f1x, fly satisfy: l1/f1x is more than 0.7 and less than 1.4; l1/f1 is more than 1.1 and y is less than 1.7.

In one embodiment, a first step is arranged in the first mounting cavity, the first lens is arranged on the first step, a second step is arranged in the second mounting cavity, the third lens is arranged on the second step, and the second lens and the third lens group are arranged at intervals through a lens press ring.

In one of the implementation modes, still be equipped with a plurality of mounting groove in the first installation cavity, a plurality of silica gel spacer set up in the mounting groove, just the silica gel spacer is located first lens with between the second lens.

In one embodiment, a third step is further arranged in the light gathering bracket, and a uniform light diffusion sheet is arranged on the third step.

In one embodiment, the module support is provided with positioning columns or positioning holes, and the light-gathering support is provided with positioning holes matched with the positioning columns of the module support or positioning columns matched with the positioning holes of the module support.

A laser optical system comprises a laser light source emitting exciting light, a light condensing module, a wavelength conversion device used for converting the exciting light into illuminating light, a collimating module used for collimating the illuminating light and a light emitting lens group used for emitting the illuminating light, wherein the light condensing module, the collimating module and the light emitting lens group are sequentially and coaxially arranged, and the ratio of the beam quality product of the exciting light in the x-axis direction to the beam quality product of the exciting light in the y-axis direction is 1.1-2.

In one embodiment, the collimating module comprises a collimating bracket and a collimating lens group arranged on the collimating bracket, the collimating lens group comprises a fourth lens with positive diopter and a fifth lens with positive diopter, an effective clear aperture of the fourth lens is D4, a gap distance between the fourth lens and the wavelength conversion device is L21, and D4 and L21 satisfy: 13-sD 4/L21<17.

In one embodiment, the collimating bracket is provided with an annular third mounting cavity, a chamfer is arranged in the third mounting cavity, a plurality of glue dispensing grooves are formed in the chamfer, the fourth lens is installed in the third mounting cavity in a guiding mode through the chamfer, and/or a fourth step is arranged on the collimating bracket, and the fifth lens is arranged on the fourth step.

In one embodiment, at least 2 support handles are arranged on the collimation support, a guide installation groove for guiding and installing the support handle is formed in the side wall of the condensation support, or at least 2 support handles are arranged on the condensation support, a guide installation groove for guiding and installing the support handle is formed in the side wall of the collimation support, and the collimation support is connected with the condensation support through the support handles.

In one embodiment, the combined focal length of the collimating lens group is f2, the farthest distance from the excited surface of the wavelength conversion device to the light emitting surface of the fifth lens is L2, and L2 and f2 satisfy: f2/L2 is more than 0.42 and less than 0.65.

In one embodiment, the wavelength conversion device comprises a sapphire fluorescent color disc, a brushless motor driving the sapphire fluorescent color disc to rotate, and a metal ring sheet arranged on the sapphire fluorescent color disc and used for maintaining dynamic balance.

Compared with the prior art, the beneficial effects of the utility model are that: spotlight module through the combination focus to spotlight lens group x axle direction and y axle direction design, can carry out high-efficient plastic and focus to asymmetric exciting light, obtain the circular facula that energy density is high, promote the holistic excitation efficiency of spotlight module, and then can promote optical system's luminous flux and illuminance.

Drawings

Fig. 1 is an exploded view of a light condensing module according to embodiment 1 of the present invention.

Fig. 2 is a structural diagram of a module bracket according to embodiment 1 of the present invention.

Fig. 3 is a structure diagram of a light-focusing bracket in embodiment 1 of the present invention.

Fig. 4 is a structural diagram of another view angle of the light-focusing bracket according to embodiment 1 of the present invention.

Fig. 5 is an exploded view of a laser optical system according to embodiment 2 of the present invention.

Fig. 6 is an optical simulation diagram of a laser optical system according to embodiment 2 of the present invention.

Description of the drawings: 10. a light-gathering module; 11. a module holder; 111. a first mounting cavity, 1111, a first step; 1112. mounting grooves; 112. a positioning column; 113. a fourth cavity; 12. a light-gathering bracket; 121. a second mounting cavity; 1211. a second step; 1212. a third step; 1213. a fourth step; 122. positioning holes; 1221. a threaded hole; 13. a condenser lens group; 131. a first lens; 132. a second lens; 133. a third lens; 14. a lens compression ring; 15. a silica gel spacer column; 20. a collimation module; 21. a collimating holder; 211. a third mounting cavity; 2111. chamfering; 2112. dispensing a glue groove; 2113. a fifth step; 212. a support handle; 2121. a through hole; 22. a collimating lens group; 221. a fourth lens; 222. a fifth lens; 30. an excitation light source; 40. a wavelength conversion device; 41. a sapphire fluorescent color wheel; 42. a brushless motor; 43. a metal ring sheet; 50. a light emitting module; 51. a light emitting bracket; 52. a light-emitting lens; 60 a copper substrate; 70. a housing.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

X axle direction and y axle direction be two directions of mutually perpendicular that conventional understood, the exciting light is the biggest at the beam quality product of x axle direction, the equal perpendicular to condenser lens group's of x axle direction and y axle direction optical axis direction (z axle).

Example 1

As shown in fig. 1, 2, and 3, a light converging module 10 is used for converging and/or focusing excitation light to a wavelength conversion device, where a beam mass product of the excitation light in an x-axis direction is greater than a beam mass product in a y-axis direction, the light converging module includes a module support 11, a light converging support 12, and a light converging lens group 13, where the light converging lens group 13 includes a first lens 131 having a negative refractive power, a second lens 132 having a positive refractive power, and a third lens 133 having a positive refractive power, the module support 11 is provided with a first mounting cavity 111, the first lens 131 is disposed in the first mounting cavity 111, the light converging support 12 is provided with a second mounting cavity 121, the third lens 133 is disposed in the second mounting cavity 121, a combined focal length of the light converging lens group 13 in the x-axis direction is f1x, a combined focal length of the light converging lens group in the y-axis direction is f1y, a distance from a light incident surface of the first lens 131 to an excited surface of the wavelength conversion device is L1, f1x, y satisfy fly: l1/f1x is more than 0.7 and less than 1.4; l1/f1y is more than 1.1 and less than 1.7.

Further, in the 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.

Further, in the embodiment, L1/f1x is more than or equal to 0.79 and less than or equal to 1.24; l1/f1y is more than or equal to 1.4 and less than or equal to 1.5.

Further, in this embodiment, L1=16.5mm, f1x =13.3mm, f1y =11.7mm. In other embodiments, L1=18.9mm, f1x =23.8, and f1y =13.2 may be used. In other embodiments, L1=21.8, f1x =23.7, and f1y =15.5 are also possible.

This embodiment adopts the condensing lens group of specific structure and optical parameter to install condensing lens group through module support, spotlight support and fix, make condensing lens group install fast and stably, it is simpler in the aspect of structure and technology, the fineness is high, is fit for stable production. By controlling the combined focal length of the condensing lens group in the x-axis direction, the combined focal length in the y-axis direction and the distance from the light incident surface of the first lens to the excited surface of the wavelength conversion device, the condensing lens group can shape and focus the excited light beam, the integral structure of the condensing module is small, and the imaging difference of the imaging optical system of the condensing module is small.

Further, in this embodiment, a first step 1111 is disposed in the first mounting cavity 111, the first lens 131 is disposed on the first step 1111, a second step 1211 is disposed in the second mounting cavity 121, the third lens 133 is disposed on the second step 1211, and the second lens 132 and the third lens 133 are spaced apart from each other by a lens ring 14. In this embodiment, the first lens 131 and the third lens 133 are respectively disposed on the steps of the module bracket 11 and the condensing lens 12, and the second lens 132 and the third lens 133 are disposed at intervals by the lens pressing ring 14, so that the condensing lens group 13 can be quickly and easily mounted and fixed, the whole condensing lens group 13 is mounted without using glue, screws or other methods for fixing, and the process can be greatly simplified while the positional accuracy of each lens is ensured.

Further, in this embodiment, a plurality of mounting grooves 1112 are further disposed in the first mounting cavity 111, a plurality of silica gel spacers 15 are disposed in the mounting grooves 1112, and the silica gel spacers 15 are disposed between the first lens 131 and the second lens 132. Further, in this embodiment, the number of the mounting grooves 1112 and the number of the silicone spacers 15 are both 2, and the silicone spacers 15 can compress the first lens 131 on one hand, and can elastically space the first lens 131 and the second lens 132 on the other hand.

Further, in this embodiment, a third step 1212 is further disposed in the light gathering bracket 12, and a uniform light diffusion sheet 80 is disposed on the third step 1212. The light homogenizing diffuser 80 can homogenize the excitation light, so that light spots irradiated to the wavelength conversion device are uniform, and the phenomenon of powder burning of the wavelength conversion device is avoided. Further, a fourth step 1213 may be further provided in the light-collecting bracket 12, and the fourth step 1213 is also used for disposing a uniform light diffusion sheet at another position. Through setting up a plurality of steps, can adjust the position of even light diffusion piece according to actual need to the size of the facula of homogenization can be adjusted, and then reach the purpose of adjusting luminous flux, illuminance. It is worth mentioning that in order to prevent the installation space of the dodging diffusion sheet from being limited by the steps, the dodging diffusion sheet is preferably configured to be long or oval, so that the dodging diffusion sheet can be installed on different steps by changing the positions of the long side, the short side and the long and short side of the dodging diffusion sheet.

Further, in this embodiment, the module bracket 11 is provided with a positioning column or a positioning hole, and the light-gathering bracket is provided with a positioning hole matched with the positioning column of the module bracket or a positioning column matched with the positioning hole of the module bracket. The positioning columns or the positioning holes are used for pre-fixing the relative positions of the module support and the light-gathering support. As shown in fig. 2 and fig. 3, in this embodiment 1, the positioning column 112 is disposed on the module bracket 11, the positioning hole 122 is disposed at a position of the light-gathering bracket 12 corresponding to the positioning column 112, and the light-gathering module can be installed by inserting the positioning column into the positioning hole 122 to achieve a pre-fixing function, which is convenient for subsequent operations of fastening the module bracket and the light-gathering bracket.

Furthermore, through holes or threaded holes are formed in the module bracket and the light gathering bracket. The module bracket and the light gathering bracket are fastened together by matching screws or screws with the through holes or threaded holes, so that the module bracket, the light gathering bracket and the light-transmitting lens group are fastened and installed.

Further, in this embodiment, the first lens 131 is a cylindrical lens, a combined focal length of the first lens group in the x-axis direction is f1x, a combined focal length of the first lens group in the y-axis direction is f1y, and f1x and fly satisfy: f1x/fly is more than or equal to 1.14 and less than or equal to 1.8.

Further, at least one surface of the first lens in the x-axis direction is a concave surface, the focal length of the first lens in the x-axis direction is f11x, and f11x and flx satisfy: the absolute value of f11 x/flx is more than or equal to 1 and less than or equal to 8.

Further, in this embodiment, the second lens light incident surface is a convex surface with a curvature radius of R21, and the light emergent surface is a plane; the effective clear aperture of the second lens is D2, the focal length of the second lens is f12, and R21 and D2 satisfy: R21/D2 is more than or equal to 1.0 and less than or equal to 1.5, f12> f1 y.

Further, in this embodiment, the third lens element is an aspheric lens, the light incident surface of the third lens element is a convex surface and has a curvature radius of R31, the light emergent surface of the third lens element is a concave aspheric surface and has an approximate spherical curvature radius of R32, the effective clear aperture of the third lens element is D3, the focal length of the third lens element is f13, and R31, R32, D3, and f13 satisfy: r31 < R32 < R31 < R2, R31/D3 < 0.82 > 0.45, f13> f1 y.

Further, the center thicknesses of the second lenses are respectively T2, and T2 satisfies: 6< | R21|/T2<11.

Example 2

As shown in fig. 5, a laser optical system includes a laser light source 30 emitting excitation light, the light collecting module 10 described in embodiment 1, a wavelength conversion device 40 for converting the excitation light into illumination light, a collimating module 20 for collimating the illumination light, and a light exit lens group 50 for emitting the illumination light, where the light collecting module 10, the collimating module 20, and the light exit lens group 50 are coaxially arranged in sequence, and a beam quality product of the excitation light source 30 in an x-axis direction is greater than a beam quality product in a y-axis direction.

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

Further, the collimating module 20 includes a collimating holder 21 and a collimating lens group 22 disposed on the collimating holder 21, the collimating lens group 22 includes a fourth lens 221 with positive refractive power and a fifth lens 222 with positive refractive power, an effective clear aperture of the fourth lens 221 is D4, a gap distance between the fourth lens 221 and the wavelength conversion device 30 is L21, and D4 and L21 satisfy: 13-D4/L21 <17. Further, 14 ≦ D4/L21 ≦ 15.

Further, the ratio of the beam mass product of the excitation light in the x-axis to the beam mass product in the y-axis is 1.1-2 in this embodiment.

Specifically, in this embodiment, L21=1.3mm, and d4=19.5mm. In other embodiments, L21=1.5mm, d4=21mm may be used. In other embodiments, L21=1.74mm, d4=24.4mm may also be possible. By controlling the distance between the fourth lens and the wavelength conversion device in the second lens set and the effective clear aperture of the fourth lens, the numerical aperture of the second lens set 22 is increased as much as possible, so that the light collection rate of the second lens set 22 is high, and the overall light collection efficiency of the optical system is effectively improved.

Further, the collimating bracket 21 is provided with an annular third mounting cavity 211, a chamfer 2111 is provided in the third mounting cavity 211, a plurality of dispensing grooves 2112 are provided on the chamfer, the fourth lens 221 is mounted in the third mounting cavity 211 in a dispensing manner through the chamfer, and/or a fifth step 2113 is provided on the collimating bracket 21, and the fifth lens is disposed on the fifth step 2113.

Further, as shown in fig. 4 and 5, in this embodiment, at least 2 support handles 212 are disposed on the alignment bracket 21, a guide installation groove 122 for installing the support handle 212 in a guiding manner is disposed on a side wall of the light-gathering bracket 12, and the alignment bracket 21 and the light-gathering bracket 12 are connected through the support handles 212. In other embodiments, at least 2 support handles may be disposed on the light-gathering bracket, and a guide mounting groove for guiding and mounting the support handles is disposed on a side wall of the collimation bracket.

Furthermore, a through hole 2121 is formed in the support handle 212, a threaded hole 1221 is formed in the side wall of the light-gathering bracket 12, and the support handle is fixed to the light-gathering bracket by passing a screw through the through hole 2121 and the threaded hole 1221.

Further, a combined focal length of the collimating lens group is f2, a farthest distance from an excited surface of the wavelength conversion device 40 to a light emitting surface of the fifth lens is L2, and L2 and f2 satisfy: f2/L2 is more than 0.42 and less than 0.65. Further, f2/L2 is more than or equal to 0.52 and less than or equal to 0.54. More specifically, in this embodiment, f2=8.9mm, l2=16.58mm, in other embodiments, f2=10.1mm, l2=19.1mm, and in other embodiments, f2=11.6mm, and l2=21.9mm may also be set.

Further, the wavelength conversion device 40 includes a sapphire fluorescent color wheel 41, a brushless motor 42 for driving the sapphire fluorescent color wheel 41 to rotate, and a metal ring 43 disposed on the sapphire fluorescent color wheel for maintaining dynamic balance. Further, as shown in fig. 3, a fourth cavity 113 spaced apart from the first mounting cavity 111 is further disposed on the module bracket 11, and the brushless motor 42 is partially accommodated in the fourth cavity 113. The fourth cavity 113 can be used to partially house the brushless motor of the wavelength conversion device, keep the overall structure of the illumination system compact, and ensure that the spacing between the lens assembly and the wavelength conversion device meets the optical design requirements. Further, the sapphire disc 41 is coated with a fluorescent layer 411, and an anti-reflection film and a yellow-reflecting blue-transmitting film (not shown) are further disposed on the sapphire disc 41. Further, the copper ring of the wavelength conversion device 40 is disposed near the center of the sapphire disk 41 and fixed to the sapphire disk by dispensing. The reason for using copper ring sheets is that copper has a higher density and thus a greater weight for an equivalent volume than aluminum. The copper ring piece has certain weight and area, can play the effect of dimension steady to the rotation of colour wheel, and on the other hand, when the colour wheel is unbalanced, can also be at the position point gluing of the lighter position of quality on the copper ring piece or at the position drilling or cutting of overweight position subtract the material, balanced colour wheel, the copper ring piece plays the effect of maintaining dynamic balance on the whole. In addition, the copper ring sheet is made of metal, so that the heat conduction effect is good, and the heat dissipation performance of the wavelength conversion device can be improved.

Further, the light-emitting lens group 50 includes a light-emitting support 51 and a light-emitting lens 52, the light-emitting support 51 and the collimating support 21 are assembled through screw-thread fit, that is, a first screw thread is arranged on the collimating support 21, and a second screw thread matched with the first screw thread is arranged on the light-emitting support 51.

Further, the laser optical system according to this embodiment further 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 for packaging the entire laser optical system. Further, a sealing silica gel pad 90 is further disposed between the copper substrate 60 and the housing 70, and the sealing silica gel pad plays a role in sealing the entire laser optical system more firmly.

Further, the fourth lens 21 is a plano-convex lens with positive bending force, a light-receiving surface facing the wavelength conversion device 30 is a plane, a light-emitting surface facing away from the wavelength conversion device is a convex surface, and a curvature radius is R42, an effective clear aperture of the fourth lens is D4, and R42 and D4 satisfy: R42/D4 is more than or equal to 0.38 and less than or equal to 0.65; the focal length of the fourth lens is f21, f2/f21 is more than 0.46 and less than 0.7, and f21/| R42| is more than or equal to 1.75 and more than or equal to 1.32.

The fifth lens is a plano-convex aspheric lens with positive bending force, a light receiving surface facing the wavelength conversion device is a plane, a light emitting surface facing away from the wavelength conversion device is a convex aspheric surface, the approximate spherical curvature radius of the light emitting surface is R52, the effective clear aperture of the fifth lens is D5, and the R52 and the D5 meet the following requirements: R52/D5 is more than or equal to 0.28 and less than or equal to 0.62; the focal length of the fifth lens is f22, f2/f22 is more than 0.4 and less than 0.85, and f22/| R52| is more than or equal to 1.82 and is more than or equal to 1.35.

Further, the central thicknesses of the fourth lenses are respectively T4, and T4 satisfies: 1.1< | R42|/T4<1.6.

An optical simulation diagram of the laser optical system in this embodiment is shown in fig. 6 (the simulation distance is 20 m), and it can be known from fig. 6 that the final spot effect of the optical system in this embodiment is circular, and the maximum central illuminance is 8.32 × 10 ⁴ lux。

Further, the laser optical system of this embodiment further includes a detection element disposed on the light path of the illumination light and configured to monitor a laser illumination signal, which may specifically be a blue light monitoring PD device (not labeled in the figure), where the blue light monitoring PD device monitors illuminance or intensity of blue light in the illumination light, so as to detect whether there is blue light leakage in the laser optical system, and improve safety performance of the laser optical system.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (11)

1. The utility model provides a spotlight module for drawing in and/or focus exciting light to wavelength conversion device, the light beam quality product of exciting light in the x axle direction is greater than the light beam quality product in the y axle direction, its characterized in that, spotlight module includes module support, spotlight support and spotlight lens group, spotlight lens group is including the first lens that has negative diopter, the second lens that has positive diopter and the third lens that has positive diopter that sets gradually, the module support is equipped with first installation cavity, first lens set up in first installation cavity, spotlight support is equipped with second installation cavity, the third lens set up in the second installation cavity, spotlight lens group's combination focus in the x axle direction is f1x, spotlight lens group's combination focus in the y axle direction is f1y, the distance that goes into the plain noodles of first lens to wavelength conversion device's stimulated face is L1, f1x, fly satisfy: l1/f1x is more than 0.7 and less than 1.4; l1/f1 is more than 1.1 and y is less than 1.7.

2. The condensing module according to claim 1, wherein a first step is disposed in the first mounting cavity, the first lens is disposed on the first step, a second step is disposed in the second mounting cavity, the third lens is disposed on the second step, and the second lens and the third lens are spaced apart from each other by a lens ring.

3. The light concentrating module according to claim 2, wherein a plurality of mounting grooves are further formed in the first mounting cavity, a plurality of silica gel spacers are disposed in the mounting grooves, and the silica gel spacers are located between the first lens and the second lens.

4. The light concentrating module of claim 1 wherein a third step is further disposed in the light concentrating bracket, and a light homogenizing and diffusing sheet is disposed on the third step.

5. The light concentrating module according to claim 1, wherein the module holder is provided with positioning posts or positioning holes, and the light concentrating holder is provided with positioning holes matched with the positioning posts of the module holder or positioning posts matched with the positioning holes of the module holder.

6. A laser optical system is characterized by comprising a laser light source emitting exciting light, the light-gathering module set of any one of claims 1 to 5, a wavelength conversion device used for converting the exciting light into illumination light, a collimation module set used for collimating the illumination light and a light-emitting lens set used for emitting the illumination light, wherein the light-gathering module set, the collimation module set and the light-emitting lens set are coaxially arranged in sequence, and the ratio of the beam quality product of the exciting light in the x-axis direction to the beam quality product of the exciting light in the y-axis direction is 1.1-2.

7. The laser optical system according to claim 6, wherein the collimating module comprises a collimating bracket and a collimating lens group disposed on the collimating bracket, the collimating lens group comprises a fourth lens with positive refractive power and a fifth lens with positive refractive power, an effective clear aperture of the fourth lens is D4, a gap distance between the fourth lens and the wavelength conversion device is L21, and D4 and L21 satisfy: 13-sD 4/L21<17.

8. The laser optical system according to claim 7, wherein the collimating holder has a third mounting cavity, a chamfer is disposed in the third mounting cavity, a plurality of dispensing grooves are disposed on the chamfer, the fourth lens is guided and mounted in the third mounting cavity by the chamfer and/or a fourth step is disposed on the collimating holder, and the fifth lens is disposed on the fourth step.

9. The laser optical system according to claim 7, wherein at least 2 support handles are provided on the collimating bracket, the side wall of the condensing bracket is provided with a guide mounting groove for guiding and mounting the support handle, or at least 2 support handles are provided on the condensing bracket, the side wall of the collimating bracket is provided with a guide mounting groove for guiding and mounting the support handle, and the collimating bracket and the condensing bracket are connected through the support handles.

10. The laser optical system according to claim 7, wherein the combined focal length of the collimating lens group is f2, the farthest distance from the excited surface of the wavelength conversion device to the light-emitting surface of the fifth lens is L2, and L2 and f2 satisfy: f2/L2 is more than 0.42 and less than 0.65.

11. The laser optical system according to claim 6, wherein the wavelength conversion device comprises a sapphire fluorescent color wheel, a brushless motor for driving the sapphire fluorescent color wheel to rotate, and a metal ring sheet arranged on the sapphire fluorescent color wheel for maintaining dynamic balance.

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