White light laser

Abstract

The utility model relates to the field of laser output devices, in particular to a white light laser. The white light laser comprises a first laser source, a second laser source, a first optical lens, a second optical lens and an excitation source. The first laser source generates first laser, the first optical mirror reflects or penetrates through the first laser source to enable the first laser source to emit to the excitation source, and the excitation source absorbs the first laser to generate excitation light. The second laser source generates second laser, and the second optical mirror reflects or transmits the second laser. The first optical mirror and the second optical mirror are sequentially arranged on the light path of the exciting light at intervals, and the exciting light sequentially passes through the first optical mirror and the second optical mirror and is combined with the second laser reflected or transmitted by the second optical mirror to form white light. According to the white light laser, the first laser is separated from the second laser source, and the second laser is separated from the first laser source, so that the first laser is prevented from damaging the second laser source, and the second laser is prevented from damaging the first laser source.

Description

Technical Field

[0001] The utility model relates to the field of laser output devices, in particular to a white light laser. Background Art

[0002] White light laser has the advantages of high brightness, supercontinuum, ultra-wideband, good directionality, etc. It has a wide range of practical application value in the fields of lighting, biomedicine, environmental detection, national defense and military. Using blue laser to irradiate fluorescent materials to generate yellow light, and mixing yellow laser and blue laser to obtain white light laser is a common method of generating white light laser. In the prior art, two blue light sources are respectively set, and the two blue light sources emit blue lasers to the dichroic mirror respectively. The two blue lasers are reflected by the dichroic mirror and propagate in two opposite directions respectively. A blue laser is emitted to the fluorescent plate, and the fluorescent plate absorbs the blue laser to generate yellow laser. The yellow laser returns and passes through the dichroic mirror, and is combined with the other blue laser to form a white light laser. In the process of reflecting blue light by the dichroic mirror of this scheme, part of the blue light can pass through the dichroic mirror, which is easy to damage the blue light source on the opposite side. Utility Model Content

[0003] In order to solve the above problems, it is necessary to provide a white light laser to reduce the occurrence of damage to the blue light source.

[0004] The present application provides a white light laser, which includes a first laser source, a second laser source, a first optical mirror, a second optical mirror and an excitation source. The first laser source is used to generate a first laser, the first optical mirror is located on the optical path of the first laser, and is tilted relative to the first laser, and is used to reflect or transmit the first laser. The reflected or transmitted first laser is emitted toward the excitation source, and the excitation source generates excitation light after absorbing the first laser. The second laser source is used to generate a second laser, the second optical mirror is located on the optical path of the second laser, and is tilted relative to the second laser, and is used to reflect or transmit the second laser. The first optical mirror and the second optical mirror are sequentially arranged on the optical path of the excitation light, and the excitation light passes through the first optical mirror and the second optical mirror in sequence, and is combined with the second laser reflected or transmitted by the second optical mirror to form white light.

[0005] The white light laser provided in the present application has an excitation source that absorbs a first laser to generate excitation light, and a first optical mirror and a second optical mirror are provided. The first optical mirror reflects the first laser through the excitation light or reflects the excitation light through the first laser, and the second optical mirror reflects the second laser through the excitation light or reflects the excitation light through the second laser. The first laser and the second laser are adjusted respectively by using the two optical mirrors to prevent the first laser and the second laser from causing damage to the first laser source and the second laser source through the same optical mirror.

[0006] In some embodiments, the white light laser further includes a first light homogenizer and a second light homogenizer. The first light homogenizer is disposed at intervals between the first laser source and the first optical mirror and is located on the optical path of the first laser, and is used to homogenize the first laser. The second light homogenizer is disposed at intervals between the second laser source and the second optical mirror and is located on the optical path of the second laser, and is used to homogenize the second laser.

[0007] In some embodiments, the white light laser further includes a first reflector and a second reflector. The first reflector is located on the optical path of the first laser, and the first reflector is tilted relative to the first laser, and is used to redirect the first laser so that the first laser can be directed toward the first optical mirror. The second reflector is located on the optical path of the second laser, and the second reflector is tilted relative to the second laser, and is used to redirect the second laser so that the second laser can be directed toward the second optical mirror.

[0008] In some embodiments, the white light laser further includes a focusing lens, which is disposed between the excitation source and the first optical mirror, and is located on the optical path of the first laser, and is used to focus the first laser onto the excitation source.

[0009] In some embodiments, the white light laser further includes a beam expansion module, which is located on the same straight line as the first optical mirror and the second optical mirror. The beam expansion module is disposed behind the second optical mirror and is used to enlarge the spot size of the white light.

[0010] In some embodiments, the beam expansion module includes a first convex lens and a second convex lens, which are arranged in sequence on the optical path of the white light. The first convex lens is used to focus the white light, and the second convex lens is used to collimate the focused white light. The distance between the second convex lens and the first convex lens is approximately the sum of the focal lengths of the first convex lens and the second convex lens, and the focal length of the second convex lens is greater than the focal length of the first convex lens.

[0011] In some embodiments, the first laser source and the second laser source are both blue light modules, and the first laser light generated by the first laser source and the second laser light generated by the second laser source are parallel blue light.

[0012] In some embodiments, the first optical mirror and the second optical mirror are both dichroic mirrors.

[0013] In some embodiments, the excitation source includes a fluorescent powder and a metal sheet. The fluorescent powder is arranged on one side of the metal sheet. The fluorescent powder is excited by the first laser and generates excitation light. The metal sheet can reflect the excitation light. The excitation light is reflected on the side of the metal sheet where the fluorescent powder is arranged and propagates in the opposite direction of the first laser.

[0014] In some embodiments, the metal sheet is mirrored aluminum.

[0015] According to the white light laser of one or more embodiments of the present application, the white light laser includes a first laser source, a second laser source, a first optical mirror, a second optical mirror and an excitation source. The first excitation source generates a first laser. The first optical mirror is tilted relative to the first laser, and the first optical mirror is located on the optical path of the first laser. The first optical mirror transmits or reflects the first laser, so that the first laser is directed toward the excitation source. The excitation source emits excitation light after absorbing the first laser. The second laser source generates a second laser. The second optical mirror is tilted relative to the second laser, and the second optical mirror is located on the optical path of the second laser. The second optical mirror transmits or reflects the second laser. The excitation light first passes through the first optical mirror and then through the second optical mirror. The second laser and the excitation light are combined into white light through the second optical mirror. The first optical mirror reflects or transmits the first laser, and the second optical mirror reflects or transmits the second laser. The first laser is separated from the second laser source, and the second laser is separated from the first laser source, so as to prevent the first laser from damaging the second laser source and the second laser from damaging the first laser source. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the optical path structure of the prior art;

[0018] Figure 2 A schematic diagram of the optical path structure of a white light laser according to an embodiment of the present application;

[0019] Figure 3 This is a schematic diagram of the optical path structure of a white light laser according to another embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the optical path structure of a white light laser according to another embodiment of the present application;

[0021] Figure 5 This is a schematic diagram of the optical path structure of a white light laser according to another embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of the optical path structure of a white light laser provided with a reflector, a light homogenizer, a focusing lens and a beam expansion module according to an embodiment of the present application.

[0023] Description of main components:

[0024] 100, white light laser; 1, first laser source; 2, second laser source; 3, excitation source; 31, phosphor; 32, metal sheet; 4, first optical mirror; 5, second optical mirror; 6, first light homogenizer; 7, second light homogenizer; 8, first reflector; 9, second reflector; 10, focusing lens; 11, beam expansion module; 111, first convex lens; 112, second convex lens;

[0025] A. First laser; B. Second laser; C. Excitation light. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the purpose, technical solution and advantages of the utility model, hereinafter, the present application describes the embodiments of the utility model with reference to the accompanying drawings, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. It should be understood that these embodiments are used to explain the technical principles of the utility model, which are only exemplary and cannot be understood as limiting the technology disclosed in this application or the application and use of the technology.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of this application are only used to distinguish different objects, rather than implying or requiring the existence of a specific relationship or order between these objects.

[0028] See also Figure 1 In the prior art, the first laser source 1 generates the first laser A, the second laser source 2 generates the second laser B, the first laser A and the second laser B pass through the same dichroic mirror, the first laser A passing through the dichroic mirror is emitted to the excitation source 3, the excitation source 3 generates the excitation light C, the excitation light C is emitted to the dichroic mirror in the opposite direction of the first laser A incident on the excitation source 3, the excitation light C passes through the dichroic mirror and is mixed with the second laser B to form white light. When the first laser A and the second laser B pass through the dichroic mirror, part of the first laser A and the second laser B are emitted to the second laser source 2 and the first laser source 1 respectively, causing damage to the first laser source 1 and the second laser source 2.

[0029] See also Figures 2 to 5The present application provides a white light laser 100, comprising a first laser source 1, a second laser source 2, a first optical mirror 4, a second optical mirror 5 and an excitation source 3. The first laser source 1 generates a first laser A, the first optical mirror 4 is located on the optical path of the first laser A, and is tilted relative to the first laser A. The first optical mirror 4 reflects or transmits the first laser A, and the reflected or transmitted first laser A is emitted to the excitation source 3, and the excitation source 3 absorbs the first laser A and generates excitation light C. The second laser source 2 generates a second laser B, the second optical mirror 5 is located on the optical path of the second laser B, and is tilted relative to the second laser B. The second optical mirror 5 reflects or transmits the second laser B. The first optical mirror 4 and the second optical mirror 5 are sequentially arranged on the optical path of the excitation light C, and the excitation light passes through the first optical mirror 4 and the second optical mirror 5 in sequence, and is mixed with the second laser B reflected or transmitted by the second optical mirror 5 to form white light. The first optical mirror 4 and the second optical mirror 5 are dichroic mirrors. The first optical mirror 4 can reflect the first laser A to pass through the excitation light C or reflect the excitation light C to pass through the first laser A. The second optical mirror 5 can reflect the second laser B to pass through the excitation light C or reflect the excitation light C to pass through the second laser B. It should be noted that the first optical mirror 4 and the second optical mirror 5 are not limited to dichroic mirrors. The first optical mirror 4 and the second optical mirror 5 can also be optical mirrors such as gratings that can selectively transmit the first laser A, the second laser B and the excitation light C.

[0030] Compared with the above-mentioned existing technical solutions, the technical solution of the present application uses the first laser A to irradiate the excitation source 3 to generate excitation light C. The excitation light C is mixed with the second laser B to obtain white light. The first laser source 1 that generates the first laser A and the second laser source 2 that generates the second laser B correspond to the first optical mirror 4 and the second optical mirror 5 respectively. The first optical mirror 4 reflects or transmits the first laser A, and the second optical mirror 5 reflects or transmits the second laser B, thereby preventing the first laser A and the second laser B from passing through the same optical mirror to cause damage to the first laser source 1 and the second laser source 2.

[0031] The first laser A and the second laser B generated by the first laser source 1 and the second laser source 2 are Gaussian beams. Figure 6 A light homogenizer is arranged between the laser source and the optical mirror to shape the first laser A and the second laser B, so that the energy distribution of the first laser A and the second laser B can be more uniform.

[0032] Specifically, a first light homogenizer 6 is provided between the first laser source 1 and the first optical mirror 4. The first light homogenizer 6 is located on the optical path of the first laser A and is used to homogenize the first laser A so that the first laser A is evenly distributed, which is beneficial for the excitation source 3 to absorb the first laser A. A second light homogenizer 7 is provided between the second laser source 2 and the second optical mirror 5. The second light homogenizer 7 is located on the optical path of the second laser B and is used to homogenize the second laser B so that the second laser B is evenly distributed, thereby making the white light more uniform.

[0033] The first laser source 1 and the second laser source 2 are blue light modules capable of generating parallel blue light. Usually, the emission directions of the first laser A and the second laser B are mostly the long axis directions of the first laser source 1 and the second laser source 2. The spacing arrangement direction of the optical mirrors of the white light laser 100 is the long axis direction of the white light laser 100. The long axis of the first laser source 1 and the second laser source 2 are arranged parallel to the spacing arrangement direction of the optical mirrors, which can make the spatial arrangement of the white light laser 100 more compact and reduce the volume of the white light laser 100.

[0034] Specifically, see Figure 6 , the first laser A and the second laser B are redirected by the first reflector 8 and the second reflector 9, so that the first laser A and the second laser B can enter the optical path system of the white light laser 100. Specifically, the first reflector 8 is arranged after the first laser source 1, the first reflector 8 is arranged obliquely relative to the first laser A, and the first reflector 8 is located on the optical path of the first laser A, and the first reflector 8 reflects the first laser A so that the first laser A is redirected to the first optical mirror 4. The second reflector 9 is arranged after the second laser source 2, the second reflector 9 is arranged obliquely relative to the second laser B, and the second reflector 9 is located on the optical path of the second laser B, and the second reflector 9 reflects the second laser B so that the second laser B is redirected to the second optical mirror 5.

[0035] It should be understood that the light emitting directions of the first laser source 1 and the second laser source 2 are not limited to the long-axis direction. When the light emitting directions of the first laser source 1 and the second laser source 2 are short-axis directions, the first laser A and the second laser B can directly enter the optical path system of the white light laser 100 without being reflected by a reflector.

[0036] See also Figure 6 A focusing lens 10 is arranged between the first optical mirror 4 and the excitation source 3. The focusing lens 10 is located on the optical path of the first laser A. The first laser A passes through the focusing lens 10 and is focused onto the excitation source 3 by the focusing lens 10. The excitation source 3 absorbs the first laser A and emits excitation light C to the side where the focusing lens 10 is located. The excitation light C passes through the focusing lens 10 to become parallel excitation light C, which is convenient for transmitting the excitation light C.

[0037] See also Figure 6 A beam expansion module 11 is arranged after the second optical mirror 5. The beam expansion module 11, the first optical mirror 4 and the second optical mirror 5 are arranged in sequence along the same straight line. The excitation light C passes through the first optical mirror 4 and the second optical mirror 5, and is combined with the second laser B reflected by the second optical mirror 5 to form white light. The white light continues to propagate and passes through the beam expansion module 11. After passing through the beam expansion module 11, the spot size of the white light is enlarged.

[0038] In some embodiments, the beam expansion module 11 includes a first convex lens 111 and a second convex lens 112, which are arranged in sequence on the optical path of the white light at intervals, and the distance between the first convex lens 111 and the second convex lens 112 is approximately equal to the sum of the focal lengths of the first convex lens 111 and the second convex lens 112. The first convex lens 111 focuses the white light, and the second convex lens 112 collimates the focused white light to obtain parallel white light. The focal length of the second convex lens 112 is greater than the focal length of the first convex lens 111, so that the spot size of the white light after being collimated by the second convex lens 112 is greater than the spot size of the white light before being focused by the first convex lens 111, thereby achieving the effect of beam expansion.

[0039] See also Figure 6 The excitation source 3 includes a phosphor 31 and a metal sheet 32. The phosphor 31 is evenly arranged on one side of the metal sheet 32. The metal sheet 32 ​​is mirror aluminum and can reflect the excitation light C. The phosphor 31 is excited by the first laser A and generates the excitation light C. A part of the excitation light C is directly transmitted to the focusing lens 10, and the other part is reflected on the side of the metal sheet 32 ​​where the phosphor 31 is arranged and then transmitted to the focusing lens 10.

[0040] In some embodiments, the phosphor 31 is a yellow phosphor 31, and the yellow phosphor 31 can absorb the first laser A to generate yellow light. The yellow phosphor 31 has a high excitation efficiency and good stability. In other embodiments, a small amount of red phosphor 31 and green phosphor 31 are added to the yellow phosphor 31, and the excitation light C includes yellow light and a small amount of red light and green light to improve the color rendering of the white light.

[0041] In summary, the white light laser 100 provided in the present application includes a first laser source 1, a second laser source 2, a first optical mirror 4, a second optical mirror 5 and an excitation source 3. The first laser source 1 generates a first laser A, the first optical mirror 4 is located on the optical path of the first laser A, the first optical mirror 4 reflects or transmits the first laser source 1, so that the first laser source 1 is directed toward the excitation source 3, and the excitation source 3 absorbs the first laser A to generate an excitation light C. The second laser source 2 generates a second laser B, the second optical mirror 5 is located on the optical path of the second laser B, and the second optical mirror 5 reflects or transmits the second laser B. The first optical mirror 4 and the second optical mirror 5 are sequentially arranged on the optical path of the excitation light C at intervals, and the excitation light passes through the first optical mirror 4 and the second optical mirror 5 in sequence, and is combined with the second laser B reflected or transmitted by the second optical mirror 5 to form a white light. Compared with the prior art, the present application uses the first optical mirror 4 and the second optical mirror 5 to respectively reflect or transmit the first laser A and the second laser B, so as to prevent the first laser A and the second laser B from passing through the same optical mirror and causing damage to the first laser source 1 and the second laser source 2. A first reflector 8 and a second reflector 9 are provided. The first reflector 8 reflects the first laser A, and the second reflector 9 reflects the second laser B, so that the long axis of the first laser source 1 and the second laser source 2 are parallel to the long axis of the white light laser 100, so as to reduce the volume of the white light laser 100. A first light homogenizer 6 is provided between the first reflector 8 and the first optical mirror 4 to make the first laser A more uniform, which is conducive to the absorption of the phosphor 31; a second light homogenizer 7 is provided between the second reflector 9 and the second optical mirror 5 to make the second laser B more uniform, so as to make the white light more uniform. A focusing lens 10 is provided between the first optical mirror 4 and the excitation source 3 to control the size of the excitation light C, so as to facilitate the transmission of the excitation light C. A beam expansion module 11 is provided after the second optical mirror 5 to obtain large-size white light.

[0042] It should be understood that the above-mentioned embodiments disclosed in this application are only for the convenience of description and example, and the technical solutions obtained by those skilled in the art by simple modification or equivalent substitution of the above-mentioned embodiments should fall within the scope of protection required by this application.

Claims

1. A white light laser, characterized in that: The white light laser comprises a first laser source, a second laser source, a first optical mirror, a second optical mirror and an excitation source; The first laser source is used to generate a first laser, and the second laser source is used to generate a second laser; The first optical mirror is located on the optical path of the first laser and is tilted relative to the first laser, and is used to reflect the first laser or allow the first laser to pass through. The first laser is emitted toward the excitation source after passing through the first optical mirror, and the excitation source generates excitation light after absorbing the first laser. The second optical mirror is located on the optical path of the second laser and is tilted relative to the second laser, and is used to reflect the second laser or allow the second laser to pass through; The first optical mirror and the second optical mirror are sequentially arranged on the optical path of the excitation light. The excitation light passes through the first optical mirror and the second optical mirror in sequence and is combined with the second laser reflected or transmitted by the second optical mirror to form white light.

2. The white light laser according to claim 1, characterized in that: The white light laser further includes a first light homogenizer and a second light homogenizer; The first light homogenizing sheet is arranged between the first laser source and the first optical mirror and is located on the optical path of the first laser, and is used to homogenize the first laser; The second light homogenizing sheet is arranged between the second laser source and the second optical mirror and is located on the optical path of the second laser, and is used for homogenizing the second laser.

3. The white light laser according to claim 1, characterized in that: The white light laser also includes a first reflector and a second reflector; The first reflector is located on the optical path of the first laser, and the first reflector is tilted relative to the first laser, and is used to deflect the first laser so that the first laser can be emitted to the first optical mirror; The second reflector is located on the optical path of the second laser. The second reflector is tilted relative to the second laser and is used to deflect the second laser so that the second laser can be emitted toward the second optical mirror.

4. The white light laser according to claim 1, characterized in that: The white light laser further comprises a focusing lens, which is arranged between the excitation source and the first optical mirror, and is located on the optical path of the first laser, and is used for focusing the first laser onto the excitation source.

5. The white light laser according to claim 1, characterized in that: The white light laser further includes a beam expansion module, which is located on the same straight line as the first optical mirror and the second optical mirror. The beam expansion module is arranged behind the second optical mirror and is used to enlarge the spot size of the white light.

6. The white light laser according to claim 5, characterized in that: The beam expansion module includes a first convex lens and a second convex lens, which are arranged in sequence on the optical path of the white light. The first convex lens is used to focus the white light, and the second convex lens is used to collimate the focused white light. The distance between the second convex lens and the first convex lens is approximately the sum of the focal lengths of the first convex lens and the second convex lens, and the focal length of the second convex lens is greater than the focal length of the first convex lens.

7. The white light laser according to claim 1, characterized in that: The first laser source and the second laser source are both blue light modules, and the first laser light generated by the first laser source and the second laser light generated by the second laser source are parallel blue light.

8. The white light laser according to claim 1, characterized in that: The first optical mirror and the second optical mirror are both dichroic mirrors.

9. The white light laser according to claim 1, characterized in that: The excitation source includes fluorescent powder and a metal sheet, wherein the fluorescent powder is arranged on one side of the metal sheet, the fluorescent powder is excited by the first laser and generates the excitation light, and the metal sheet can reflect the excitation light. The excitation light is reflected on the side of the metal sheet where the fluorescent powder is arranged and propagates in the opposite direction of the first laser.

10. The white light laser according to claim 9, characterized in that: The metal sheet is mirror-finished aluminum.

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