WO2020181769A1

WO2020181769A1 - Laser compound light source

Info

Publication number: WO2020181769A1
Application number: PCT/CN2019/112276
Authority: WO
Inventors: 周少丰; 黄良杰; 尹晓峰
Original assignee: 深圳市星汉激光科技有限公司
Priority date: 2019-03-08
Filing date: 2019-10-21
Publication date: 2020-09-17
Also published as: CN209448216U

Abstract

Provided is a laser compound light source (100), including a COS array (11), a collimating lens array (10), a mirror array (14), a focus lens (15) and an optical fiber (16), wherein at least two monochromatic lasers are emitted from the COS array (11), pass through the collimating lens array (10), the mirror array (14) and the focus lens (15), and then are mixed in the optical fiber (16) to uniformly emit the compound light. The laser compound light source (100) has high light-to-light conversion efficiency, and has a simple structure and is easy to dissipate heat.

Description

A laser composite light source

Technical field

This application relates to the field of laser sources, in particular to a laser composite light source.

Background technique

In applications such as laser lighting, laser projection, laser car lights, etc., lasers are usually used as a light source to be combined into a composite light source from multiple lasers. At present, the most common laser composite light source is a white light laser source. Take a white laser source as an example. At present, the main method of using laser to generate white light is to irradiate a blue laser to a phosphor. The fluorescent material is excited by the blue laser and spontaneously radiates light of longer wavelength. These newly generated light and the original blue light Mixing produces white light.

In the process of realizing this application, the inventor found that the above related technologies have at least the following problems: When the existing white light laser device is working, a large amount of blue light energy is converted into heat and accumulated on the phosphor, and the light-to-light conversion efficiency is low, which also brings A lot of heat that is difficult to handle. Most of the existing laser composite light sources on the market have the problems of low light-to-light conversion efficiency and difficult heat dissipation as mentioned above.

Summary of the invention

In view of the above-mentioned defects of the prior art, the purpose of this application is to provide a laser composite light source with high light-to-light conversion efficiency.

The purpose of this application is achieved through the following technical solutions:

To solve the above technical problems, an embodiment of the present application provides a laser composite light source, including:

COS array, used to emit at least two monochromatic lasers;

The collimating lens array is arranged in the light emitting direction of the COS array and coincides with the optical axis of the COS array;

The mirror array is placed obliquely at a preset angle in the light-emitting direction of the collimating lens array;

The focusing lens is arranged in the light emitting direction of the mirror array;

Optical fiber, the end face of the optical fiber is arranged at the focus of the light exit direction of the focusing lens and coincides with the optical axis of the focusing lens, and at least two monochromatic lasers are mixed in the optical fiber to uniformly emit composite light.

Optionally, the collimating lens array includes a fast axis collimating lens array and a slow axis collimating lens array.

Optionally, the fast axis collimating lens array includes at least two fast axis collimating lenses, the slow axis collimating lens array includes at least two slow axis collimating lenses, and the mirror array includes at least two reflective lenses. mirror.

Optionally, the COS array includes at least two different COS elements and emits different lasers respectively.

Optionally, the number of the COS element, the fast-axis collimating lens, the slow-axis collimating lens, and the mirror is the same.

Optionally, the COS element includes: a laser chip and a heat sink, and the laser chip is mounted on the heat sink.

Optionally, each of the COS elements and each of the fast-axis collimating lens in the COS array, the fast-axis collimating lens array, the slow-axis collimating lens array, and the mirror array , Each of the slow axis collimating lens and each of the reflecting mirrors are arranged on the same optical path in a one-to-one correspondence.

Optionally, the fast axis collimating lens and the slow axis collimating lens are cylindrical lenses.

Optionally, at least two of the COS elements are staggered in the direction perpendicular to the light emission direction to form a step structure, at least two of the reflectors are staggered in the light emission direction to form a step structure, and each of the COS elements is the same as the light source. The distances of the mirrors on the road are equal.

Optionally, at least two of the COS elements are placed flush in a direction perpendicular to the light emitting direction, at least two of the reflecting mirrors are arranged in parallel, and the reflecting mirrors are dichroic mirrors.

Compared with the prior art, the beneficial effect of the present application is: different from the prior art, the embodiment of the present application provides a laser composite light source; by setting the COS array to emit at least two monochromatic lasers, after collimation After the lens array is collimated, it is coupled to the optical fiber through the focusing lens in the light exit direction of the reflector array to mix and emit composite light. The device has high light-to-light conversion efficiency, simple structure and easy heat dissipation.

Description of the drawings

One or at least two embodiments are exemplified by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. The components/modules and steps with the same reference numerals in the drawings Denoted as similar components/modules and steps, unless otherwise stated, the figures in the drawings do not constitute a scale limitation.

FIG. 1 is a schematic diagram of the overall structure of a laser composite light source provided in an embodiment of the present application;

Figure 2 is a schematic diagram of the overall structure of a COS element provided in an embodiment of the present application.

detailed description

The application will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of this application. These all belong to the protection scope of this application.

In order to make the purpose, technical solutions, and advantages of this application clearer, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and not used to limit the application.

Please refer to Figures 1 and 2. Figure 1 is a schematic diagram of the overall structure of a laser composite light source 100 provided in an embodiment of the present application. The embodiment of the present application provides a laser composite light source 100, including: a COS array 11, a collimator The lens array 10, the mirror array 14, the focusing lens 15 and the optical fiber 16, the COS array 11 emits at least two monochromatic lasers after passing through the collimating lens array 10, the mirror array 14 and the focusing lens 15 , The composite light is uniformly emitted after mixing in the optical fiber 16.

The COS array 11 is used to emit at least two monochromatic lasers. The COS array 11 includes at least two different COS elements 110 and emits different lasers respectively. Please refer to FIG. 2, which is a schematic diagram of the overall structure of the COS element 110 provided in an embodiment of the present application. The COS element 110 includes a laser chip 111 and a heat sink 112. The laser chip 111 is mounted on the heat sink 112. on.

The collimating lens array 10 is arranged in the light exit direction of the COS array 11 and coincides with the optical axis of the COS array 11. The collimating lens array 10 includes a fast axis collimating lens array 12 and a slow axis collimating lens Array 13.

The fast-axis collimating lens array 12 (also referred to as FAC array) includes at least two fast-axis collimating lenses 120. The fast axis collimating lens 120 is a cylindrical lens.

The slow-axis collimating lens array 13 (also referred to as SAC array) includes at least two slow-axis collimating lenses 130. The slow axis collimating lens 130 is a cylindrical lens.

The reflector array 14 is placed obliquely at a predetermined angle in the light emitting direction of the collimating lens array. The mirror array 14 includes at least two mirrors 140. Wherein, the emission direction and stack density of the emitted light beam can be adjusted by adjusting the angle at which the at least two reflectors 140 are placed in the light emission direction and/or the staggered distance between them.

The focusing lens 15 is arranged in the light exit direction of the mirror array 14 for focusing and exiting the light path incident on the focusing lens 15.

The end face of the optical fiber 16 is set at the focal point of the light-emitting direction of the focusing lens 15 and coincides with the optical axis of the focusing lens 15, at least two monochromatic lasers are mixed in the optical fiber 15 to uniformly emit composite light .

The number of the COS element 110, the fast-axis collimating lens 120, the slow-axis collimating lens 130 and the reflecting mirror 140 are the same. In addition, each of the COS elements 110 and each of the fast axis collimating lens array 12, the slow axis collimating lens array 13 and the mirror array 14 of the COS array 11, The axis collimating lens 120, each of the slow axis collimating lens 130 and each of the reflecting mirrors 140 are arranged on the same optical path in a one-to-one correspondence.

In the embodiment of the present application, at least two monochromatic lasers are emitted by setting the COS array 11, and after being collimated by the collimating lens array 10, they are coupled to the optical fiber 16 through the focusing lens 15 in the direction of the reflecting mirror array 14 to be mixed and emitted. With composite light, the device has high light-to-light conversion efficiency, simple structure and easy heat dissipation.

In the embodiment of the present application, please continue to refer to FIG. 1. At least two of the COS elements 110 are staggered in the direction perpendicular to the light exiting direction to form a stepped structure, and at least two of the reflectors 140 are staggered in the light exiting direction to form a stepped structure. In the structure, the distance between each COS element 110 and the mirror 140 on the same optical path is equal. The staggered placement of the COS element 110 or the mirror 140 can prevent two or more monochromatic lasers from being blocked by each other when they are emitted from the COS element 110 and enter the focusing lens 15 through multiple optical elements.

Specifically, in the embodiment shown in FIG. 1, the laser composite light source 100 further includes a housing 17 and a fiber fixing port 18, and the housing is used to fix the COS array 11 and the collimating lens array. 10. The reflector array 14, the focusing lens 15, and the optical fiber fixing hole 18, and the optical fiber fixing port 18 is used to fix one end of the optical fiber 16. And there is,

The COS array 11 includes three COS elements 110, the fast axis collimating lens array 12 includes three fast axis collimating lenses 120, and the slow axis collimating lens array 13 includes three slow axis collimators. A straight lens 130, the mirror array 14 includes three mirrors 140, and the number is three. Among them, the three COS elements 110 from left to right are respectively provided with three wavelengths of red, green, and blue (ie R, G, B) laser chips 111, so that the monochromatic colors of the three wavelengths can be mixed and emitted in the optical fiber 16. White light, that is, the laser composite light source 100 shown in FIG. 1 is a white light laser source. The mirror array 14 is placed obliquely at an angle of 45 degrees in the light-emitting direction of the slow axis collimating lens array 13.

In the embodiment of the present application, three monochromatic lasers are emitted by setting the COS array 11, which are collimated by the fast-axis collimating lens array 12 and the slow-axis collimating lens array 13, and then three laser beams are emitted in the light-emitting direction of the mirror array 14. The monochromatic lasers are coupled to the optical fiber 16 through the focusing lens 15 without blocking each other to mix and emit composite light. The device has high light-to-light conversion efficiency, and has a simple structure and easy heat dissipation.

In some other embodiments, the selection of each laser chip 111 and the number of the COS element 110, the fast-axis collimating lens 120, the slow-axis collimating lens 130 and the mirror 140 require The choice is made according to the properties of the final required composite light. There is no need to set the synthetic white light. At the same time, the luminous intensity can be adjusted independently for each laser chip 111, so that the final emitted light color temperature, color gamut and color can be adjusted. The collimating lens array 10, the mirror array 14, and the focusing lens 15 will also be adjusted accordingly. The number, model, size, etc. of the COS element 110, the fast-axis collimating lens 120, the slow-axis collimating lens 130, and the reflecting mirror 140 can be set according to actual needs. The type, size, etc. of the optical fiber 16 can also be set according to actual needs, and the angle of the reflector 140 can be set according to the light spot incident on the focusing lens 15 or the stacking of parallel beams, without being restricted to the implementation of this application. Limitations of examples.

In some embodiments, the COS elements 110 or the mirrors 140 may not need to be placed randomly, at least two of the COS elements 110 or at least two of the mirrors 140 may be placed on the same horizontal surface, and there is, At least two of the COS elements 110 are arranged flush in the vertical direction of the light emitting direction, at least two of the reflecting mirrors 140 are arranged in parallel, and the reflecting mirrors 140 are dichroic mirrors. This solution uses dichroic mirrors of different wavelengths to achieve beam superposition.

Specifically, when the COS array 11 includes three COS elements 110, the fast-axis collimating lens array 12 includes three fast-axis collimating lenses 120, and the slow-axis collimating lens array 13 includes three The slow axis collimating lens 130, the mirror array 14 includes three mirrors 140 when the number is three, and when the three COS elements 110 from left to right are set to be red, green, and blue ( That is, R, G, B) three wavelengths of the laser chip 111, and the mirror array 14 is placed obliquely at an angle of 45 degrees in the light-emitting direction of the slow axis collimating lens array 13, from left to right three The reflector 140 should be set as a reflector that can reflect all colors, a reflector that reflects green and red, and a reflector that reflects blue, transparent, and red, so that the light beams can be superimposed and incident on the focusing lens 15, and the same The optical fiber 16 emits a white light laser source after light mixing.

In the embodiment of the present application, three monochromatic lasers are emitted by setting the COS array 11, which are collimated by the fast-axis collimating lens array 12 and the slow-axis collimating lens array 13, and then three laser beams are emitted in the light-emitting direction of the mirror array 14. After the monochromatic lasers are superimposed on each other, they are coupled to the optical fiber 16 through the focusing lens 15 to mix and emit composite light. The device has high light-to-light conversion efficiency, and has a simple structure and easy heat dissipation.

In some other embodiments, the selection of each laser chip 111 and the number of the COS element 110, the fast-axis collimating lens 120, the slow-axis collimating lens 130 and the mirror 140 require The choice is made according to the properties of the final required composite light, and there is no need to preset the synthetic white light. At the same time, the luminous intensity can be adjusted independently for each laser chip 111, so that the final emitted light color temperature, color gamut and color can be adjusted. The number, model, size, etc. of the COS element 110, the fast-axis collimating lens 120, the slow-axis collimating lens 130, and the reflecting mirror 140 can be set according to actual needs. The type, size, etc. of the optical fiber 16 can also be set according to actual needs, and the angle of the reflector 140 can be set according to the light spot incident on the focusing lens 15 or the stacking of parallel beams, without being restricted to the implementation of this application. Limitations of examples.

The embodiment of the application provides a laser composite light source; by setting the COS array to emit at least two monochromatic lasers, after collimating by the collimating lens array, in the direction of the reflecting mirror array through the focusing lens coupled to the optical fiber for mixing The composite light is emitted, the light-to-light conversion efficiency of the device is high, and the structure is simple and easy to dissipate heat.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, not to limit them; under the idea of this application, the above embodiments or the technical features in different embodiments can also be combined. There are many other changes in different aspects of the application as described above. For the sake of brevity, they are not provided in details; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can be modified, or the regional technical features therein can be equivalently replaced; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions in the embodiments of the application .

Claims

A laser composite light source, characterized in that it comprises:

COS array, used to emit at least two monochromatic lasers;

The collimating lens array is arranged in the light emitting direction of the COS array and coincides with the optical axis of the COS array;

The mirror array is placed obliquely at a preset angle in the light-emitting direction of the collimating lens array;

The focusing lens is arranged in the light emitting direction of the mirror array;

Optical fiber, the end face of the optical fiber is arranged at the focus of the light exit direction of the focusing lens and coincides with the optical axis of the focusing lens, and at least two monochromatic lasers are mixed in the optical fiber to uniformly emit composite light.
The laser composite light source according to claim 1, wherein:

The collimating lens array includes a fast axis collimating lens array and a slow axis collimating lens array.
The laser composite light source according to claim 2, wherein:

The fast axis collimating lens array includes at least two fast axis collimating lenses, the slow axis collimating lens array includes at least two slow axis collimating lenses, and the mirror array includes at least two mirrors.
The laser composite light source according to claim 3, wherein:

The COS array includes at least two different COS elements and emits different lasers respectively.
The laser composite light source according to claim 4, wherein:

The number of the COS element, the fast axis collimating lens, the slow axis collimating lens and the reflecting mirror is the same.
The laser composite light source according to claim 5, wherein:

The COS element includes a laser chip and a heat sink, and the laser chip is mounted on the heat sink.
The laser composite light source according to claim 6, wherein:

The COS array, the fast-axis collimating lens array, the slow-axis collimating lens array, and each of the COS elements in the mirror array, each of the fast-axis collimating lens, and each The slow axis collimating lens and each of the reflecting mirrors are arranged on the same optical path in a one-to-one correspondence.
The laser composite light source according to claim 7, wherein:

The fast axis collimating lens and the slow axis collimating lens are cylindrical lenses.
The laser composite light source according to claim 8, wherein:

At least two of the COS elements are staggered in the direction perpendicular to the light exiting direction to form a stepped structure, at least two of the reflectors are staggered in the light exiting direction to form a stepped structure, and each of the COS elements is on the same optical path as the The distances of the mirrors are equal.
The laser composite light source according to claim 8, wherein:

At least two of the COS elements are arranged flush in the vertical direction of the light emitting direction, at least two of the reflecting mirrors are arranged in parallel, and the reflecting mirrors are dichroic mirrors.