CN214540357U - Light source beam combining structure and light source module - Google Patents

Abstract

A light source beam combining structure and a light source module relate to the field of projection display. By arranging the monochromatic light with the same color into at least two beams, the light energy can be superposed when various monochromatic lights are combined in the light source beam combining structure, so that the energy density of a final combined light source is greatly improved, and the display brightness of a corresponding image is improved; the number of the light sources of each color is flexibly combined, so that the light sources of different colors can be flexibly configured and adjusted according to the display requirements, and the requirements of different images on different single-color light brightness are met; the fixing mode of the LD laser is set to four-point welding, so that the stability of the LD laser is improved, the spacing distance between two adjacent LD lasers is reduced, the working distance of light paths of all incident light sources is synchronously reduced, and the light source coupling efficiency and the brightness of a beam combining light source are further improved.

Description

Light source beam combining structure and light source module

Technical Field

The utility model relates to a projection display field particularly, relates to a light source closes and restraints structure and light source module.

Background

The imaging principle of the scanning projection technology is that light corresponding to each pixel point of an image to be displayed is modulated through a light source, then the light corresponding to each pixel point is scanned and output by driving a scanning optical fiber through a scanner or by the movement of a scanning mirror of a micro-electro-mechanical system, and therefore the light corresponding to each pixel point of the image to be displayed is projected onto a projection screen one by one to form a projection picture.

It should be noted that, an optical fiber scanning technology, which is one of the new scanning projection technologies, is an optical fiber scanning system generally composed of an optical fiber scanner and a light source, wherein the light source input to the optical fiber scanner is generally combined with light emitting units of multiple colors (such as red, green, and blue light emitting units). However, the existing laser light source beam combining structure has the defect of low energy density of the beam combining light source, which greatly affects the brightness of the beam combining light source corresponding to the single laser light source beam combining structure, thereby affecting the display effect of the image as a whole.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a light source closes and restraints structure, its energy density that can show the improvement beam combination light source, and then on the basis that does not reduce coupling efficiency, increases substantially the luminance that closes the beam combination light source to improve final image display's whole luminance.

Another objective of the present invention is to provide a light source module, which includes the above light source beam combining structure, so that the light source beam combining structure has various advantages.

The embodiment of the utility model is realized like this:

a light source beam combining structure comprises a shell and a focusing lens, wherein a second beam combining channel and a plurality of first beam combining channels are arranged in the shell, the second beam combining channel and the plurality of first beam combining channels are used for providing a working space for light source beam combining, each first beam combining channel is vertically communicated with the second beam combining channel, and the focusing lens is arranged at one end of the second beam combining channel;

each first beam combining channel is at least internally provided with a first light source beam combining component, and a second light source beam combining component is arranged at a position corresponding to each first beam combining channel in the second beam combining channel so that a combined light source combined in the second beam combining channel can be superposed with a main optical axis of the focusing lens; the first light source entering each first light source beam combining and finishing component has at least two beams, the plane formed by the plurality of first light sources is a first plane, the plane formed by the first beam combining light of the plurality of first light sources combined on the first light source beam combining and finishing component and the beam combining light source is a second plane, and the first plane is vertical to the second plane; at least two monochromatic lights of all the monochromatic lights incident on the plurality of first light source beam combining components have the same color.

Further, in a preferred embodiment of the present invention, the first combined light of each first combined light channel is perpendicular to the combined light source in the second combined light channel, and two adjacent first light sources are perpendicular to each other; the light source beam combining structure further comprises a plurality of collimating lenses which are fixed in the shell and correspond to the monochromatic light one by one.

Further, in a preferred embodiment of the present invention, the first light source combining and combining component is a polarization beam splitter prism, and the second light source combining and combining component is a light filter; at least one of the first light sources corresponding to each first light source combination component has the same direction as the corresponding first combined light.

Further, in the preferred embodiment of the present invention, the number of the corresponding first light sources in each first combined beam channel is two and is monochromatic light, and the monochromatic light at least includes red light, green light and blue light.

Further, in the preferred embodiment of the present invention, the light source combining structure further comprises an infrared light source combining channel and a corresponding collimating lens, and an optical filter corresponding to the collimating lens, wherein the infrared light source combining channel and the second combining channel are vertically communicated, the optical filter is disposed in the second combining channel, and the collimating lens is disposed at one end of the infrared light source combining channel opposite to the optical filter.

Further, in a preferred embodiment of the present invention, the monochromatic light sequentially includes blue light, green light, red light and infrared light from far to near according to the working distance of the light path; the working distance of the light path is the distance of the light path between each corresponding collimating lens and the corresponding focusing lens.

Further, in a preferred embodiment of the present invention, the housing is rectangular, and a direction of a main optical axis of the focusing lens is parallel to a longitudinal direction of the housing; the plurality of collimating lenses are arranged on the same side of the shell and are arranged in an array.

Further, in a preferred embodiment of the present invention, the light source beam combining structure further includes a plurality of LD lasers for providing monochromatic light to the corresponding collimating lenses, and the plurality of LD lasers are fixed to the housing and adapted to the corresponding collimating lenses; the plurality of LD lasers sequentially include a blue light source laser, a green light source laser, a red light source laser and an infrared light source laser along the direction of the beam combination source.

Further, in the preferred embodiment of the present invention, each LD laser is fixed by laser spot welding, and the welding points of the laser spot welding are four arranged in a circular array, and the connecting line formed by two opposite welding points and the beam combining light source are at a 45-degree included angle.

A light source module comprises the light source beam combining structure and an optical fiber, wherein the optical fiber and a focusing lens form a focusing assembly, and the optical fiber is fixed at the beam combining light source output end of the focusing lens.

The embodiment of the utility model provides a beneficial effect is:

the embodiment of the utility model provides a light source closes and restraints structure and light source module through setting the monochromatic light of the same colour to have two bundles at least, can carry out the stack of light energy when making a beam together in the light source closes and restraints the structure for various monochromatic lights to increase substantially and finally close the energy density of a beam source, and then improve the display brightness of corresponding image; the number of the light sources of each color is flexibly combined, so that the light sources of different colors can be flexibly configured and adjusted according to the display requirements, and the requirements of different images on different single-color light brightness are met; the fixing mode of the LD laser is set to four-point welding, so that the stability of the LD laser is improved, the spacing distance between two adjacent LD lasers is reduced, the working distance of light paths of all incident light sources is synchronously reduced, and the light source coupling efficiency and the brightness of a beam combining light source are further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic three-dimensional structure diagram of a light source beam combining structure according to a first embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of an internal structure of a light source beam combining structure according to a first embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of an internal structure of a light source beam combining structure according to a second embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of an internal structure of a beam combining structure of a light source according to a second embodiment of the present invention at a sectioning view a-a in fig. 3;

fig. 5 is a partial schematic view of an end surface of a light source combining structure corresponding to an LD laser according to a second embodiment of the present invention;

fig. 6 is a schematic three-dimensional structure diagram of a light source module according to a second embodiment of the present invention.

Icon: 100-a light source beam combining structure; 200-a light source beam combining structure; 20-a light source module; 101-a focusing lens; 102-a beam combining light source; 110-a first beam combining channel; 111-first combined beam light; 112-blue light; 113-green light; 114-red light; 120-a housing; 130-a second beam combining channel; 140-an optical filter; 142-a polarizing beam splitter prism; 150-infrared light source beam combining channel; 151-infrared light; 180-a collimating lens; 201-an optical fiber; 290-LD laser; 291-welding point.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely vertical, but may be slightly inclined. Such as "vertical" simply means that its orientation is more vertical than "horizontal" and does not mean that the structure must be perfectly vertical, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

First embodiment

Before explaining the embodiments of the present invention, the applicant first needs to explain that, in practice, the solution to improve the energy density of the beam combining light source (i.e. the display brightness corresponding to the projected image) can also theoretically improve the power of the single laser by adjusting, and further improve the energy density of the monochromatic light before the beam combining. However, practice shows that the technical means of increasing the power of the laser can simultaneously and greatly reduce the coupling efficiency of various light sources during beam combination coupling, so that the energy density of the final beam combination light source cannot be greatly increased, and the energy consumption cost is increased. Therefore, the applicant has filed the light source combining structure 100 of the present application.

Specifically, please refer to fig. 1 and fig. 2 in combination, an embodiment of the present invention provides a light source beam combining structure 100, which includes a housing 120 and a focusing lens 101, wherein a light source beam combining process is performed inside the housing 120, specifically, a second beam combining channel 130 and a plurality of first beam combining channels 110 are disposed inside the housing 120, the second beam combining channel 130 provides a working space for light source beam combining, each first beam combining channel 110 is vertically communicated with the second beam combining channel 130, and the focusing lens 101 is disposed at one end of the second beam combining channel 130, and is configured to receive a combined light source 102 and focus the combined light source 102;

furthermore, each first beam combining channel 110 is provided with at least one first light source beam combining member, and a second light source beam combining member is provided in the second beam combining channel 130 at a position corresponding to each first beam combining channel 110, so that the combined light source 102 combined in the second beam combining channel 130 can be overlapped with the main optical axis of the focusing lens 101. Optionally, the first light source combining component is a polarization beam splitter 142, and the second light source combining component is a filter 140. It should be noted that, in the present embodiment, the first light source combining and combining component is defined as the polarization beam splitter prism 142, and the second light source combining and combining component is defined as the optical filter 140, but in other embodiments, which light source combining component is the optical filter 140 or the polarization beam splitter prism 142 needs to be selected according to the actual light source combining requirement, and in other embodiments, the light source combining and combining component may be other than the optical filter 140 and the polarization beam splitter prism 142.

It should be emphasized that there are at least two first light sources incident to each first light source combining component, the plane formed by the plurality of first light sources is a first plane, the first combined light 111 formed by the plurality of first light sources on the first light source combining component and the plane formed by the combined light source 102 are a second plane, and the first plane and the second plane are perpendicular; at least two monochromatic lights of all the monochromatic lights incident on the plurality of first light source beam combining components have the same color. By setting monochromatic light of the same color to have at least two beams, the light energy can be superimposed when the various monochromatic light beams are combined in the light source combining structure 100, so that the energy density of the final combined light source 102 is greatly increased, and the display brightness of the corresponding image is further improved.

Optionally, the first combined beam 111 of each first combined beam channel 110 is perpendicular to the combined beam source 102 in the second combined beam channel 130, and two adjacent first light sources are perpendicular to each other. Preferably, at least one of the first light sources corresponding to each first light source combining structure is in the same direction as the corresponding first combined light 111. In this embodiment, the number of the corresponding first light sources in each first beam combining channel 110 is preferably limited to two and all are monochromatic light, and the first light sources corresponding to the two monochromatic light sources are perpendicular to each other, where one first light source is in the same direction as the corresponding first beam combining light 111. It should be noted that, in other embodiments of the present invention, not limited to the above-mentioned one exemplified in the embodiment, the number of the corresponding first light sources in each first combining channel 110 may be 2, 3, 4, 5, etc., and when the number of the first light sources is 2, the position relationship of the two first light sources is also various, without limitation, as long as the plurality of first light sources can form the first combined light 111 in the first combining channel 110 to pass through the optical filter 140 incident on the second combining channel 130 under the combined beam of the first light source combining components.

Further optionally, the monochromatic light at least comprises red light, green light and blue light. It should be noted that, in other embodiments, the light sources are not limited to the red light, the green light and the blue light provided by the present embodiment, and may be other light sources capable of providing original monochromatic light or other types of non-monochromatic light for the display light source.

Further, the light source beam combining structure 100 provided by this embodiment further includes a plurality of collimating lenses 180, and the plurality of collimating lenses 180 are fixed in the housing 120 and correspond to each monochromatic light one to one. It should be noted that, preferably, the light source combining structure 100 provided by the embodiment of the present invention is further provided with an infrared light source combining channel 150 and a corresponding collimating lens 180, and an optical filter 140 corresponding to the collimating lens 180, the infrared light source combining channel 150 is vertically communicated with the second combining channel 130, the optical filter 140 is disposed in the second combining channel 130, and the collimating lens 180 is disposed at one end of the infrared light source combining channel 150 opposite to the optical filter 140.

More specifically, the monochromatic light includes blue light 112, green light 113, red light 114, and infrared light 151 in order from far to near according to the optical path working distance. The optical path working distance corresponds to the optical path distance between each collimator lens 180 and the focusing lens 101.

Further alternatively, the housing 120 has a rectangular parallelepiped shape, and the main optical axis direction of the focusing lens 101 is parallel to the length direction of the housing 120; the plurality of collimating lenses 180 are disposed on the same side of the housing 120 and arranged in an array. It should be noted that, the above limitation is performed on the shape and the internal structure layout of the shell 120 of the light source combining structure 100, so as to perform the integrated concentration of the whole light source combining structure 100 from the outer shell to the internal structure to the maximum extent, so that the occupied space is the minimum on the basis of simultaneously meeting the requirements of the optical energy coupling efficiency and the light source combining energy density, and the production and use requirements of practical popularization and application are met.

Second embodiment

Referring to fig. 1 to 5, an embodiment of the present invention provides a light source combining structure 200, which is substantially the same as the light source combining structure 100 provided in the first embodiment, except that the light source combining structure 200 provided in this embodiment further includes a plurality of LD lasers 290 for providing monochromatic light to the corresponding collimating lens 180, and the plurality of LD lasers 290 are fixed to the housing 120 and are adapted to the corresponding collimating lens 180. It should be noted that the light source beam combining structure 100 provided in this embodiment is mainly used in the field of laser projection display, so that the LD laser 290 is used as the light source generator of monochromatic laser, in other embodiments of the present invention, the light source beam combining structure is not limited to this embodiment, and when there are different light sources for projection display, the types of the light source generators can be flexibly configured according to the different properties of the light sources.

More specifically, the plurality of LD lasers 290 sequentially includes a blue light source laser, a green light source laser, a red light source laser, and an infrared light source laser in the direction of the combined light source 102. It should be noted that each color laser depends on the number of the first light sources, such as two red color first light sources, and then two red light source lasers. It should be noted that, in this embodiment, the sequential limitation of the plurality of LD lasers 290 with different colors is structurally corresponding to the limitation of the distance between the operating optical paths of the various monochromatic lights in the first embodiment, and the LD laser 290 with the corresponding color provides the monochromatic light with the corresponding color when operating. It should be further noted that, in other embodiments of the present invention, the setting mode of the LD laser 290 is not limited, and the number and the internal structure thereof may be any combination mode, as long as the monochromatic light with the same color has at least two beams, such as a four-in-one light source beam combining structure composed of two red light source lasers, one green light source laser and one blue light source laser; if on the basis of an infrared light source laser, the red light source laser is set into two or more, the green light source laser is set into one or more, and the blue light source laser is set into one or more, so a five-in-one light source beam combining structure, a six-in-one light source beam combining structure, a seven-in-one light source beam combining structure, an eight-in-one light source beam combining structure, a nine-in-one light source beam combining structure and other multiple-in-one light source beam combining structures with different light source numbers can be formed, wherein when the number of the light source lasers is more, the second beam combining channel 130 can also be a central shaft channel, and the two sides are provided with symmetrical first beam combining channels 110 and corresponding laser beam combining structural characteristics.

Further, in this embodiment, each LD laser 290 is fixed by laser spot welding, and the welding points 291 of the laser spot welding are four in a circular array, and a connection line formed by two opposite welding points 291 forms an included angle of 45 degrees with the beam combining light source 102. It should be noted that the reason why the arrangement and number of the laser spot welding are limited is that, compared with the conventional three-point spot welding (the conventional three-point circle is formed by three welding points, and the radius included angle between every two welding points is 120 degrees), the four-point welding of the embodiment not only makes the LD laser 290 more stable and firm in welding, moreover, because of four-point welding, the corresponding radius included angle of every two welding points 291 is only 90 degrees, when the welding of the adjacent two LD lasers 290 is performed, the mutual influence of the processing processes becomes smaller, this can make the distance between two adjacent LD lasers 290 smaller, which is beneficial for the volume of the light source combining structure 200 to be further integrated and concentrated, meanwhile, the whole light path working distance of all incident light sources is reduced synchronously, the precision deviation is reduced, and the coupling efficiency and the brightness of the beam combining light source 102 are improved. It should be emphasized that, in other embodiments of the present invention, the laser spot welding method is not limited to the laser spot welding method described in this embodiment, and other methods of connection and fixation, such as adhesion, magnetic connection, and snap connection, may also be used.

Referring to fig. 1 to 6, an embodiment of the present invention further provides a light source module 20, which includes the light source beam combining structure 200 and an optical fiber 201, the optical fiber 201 and the focusing lens 101 form a focusing assembly, and the optical fiber 201 is fixed at an output end of the beam combining light source 102 of the focusing lens 101. It should be noted that, after the combined light source 102 of the light source combining structure 200 enters the focusing lens 101 and is output to the optical fiber 201, the optical fiber 201 can be transmitted to other scanning devices, such as an optical fiber scanner, so as to implement the final projection display.

It should be emphasized that the embodiment of the present invention provides a working principle of the light source module 20: seven LD lasers 290 work correspondingly to emit corresponding monochromatic lasers, after the monochromatic lasers pass through a collimating lens 180 to be collimated, correspondingly, infrared light 151 is directly incident on a filter 140 nearest to a focusing lens 101, two blue lights 112 are incident on corresponding polarization beam splitting prisms 142 to be combined to form a first combined light 111 of the blue light 112, two green lights 113 are incident on corresponding polarization beam splitting prisms 142 to be combined to form a first combined light 111 of the green light 113, two red lights 114 are incident on corresponding polarization beam splitting prisms 142 to be combined to form a first combined light 111 of the red light 114, finally, the first combined light 111 of three colors is incident on the filter 140 corresponding to a second combined light channel 130 through the corresponding first combined light channel 110 at an incident angle of 45 degrees and is combined with the infrared light 150 to form a combined light source 102, and the combined light source 102 is incident into the focusing lens 101 and is transmitted to an optical fiber 201, the optical fiber 201 is then transmitted to other scanning devices (e.g., fiber scanners) to achieve the final projection display.

To sum up, the embodiment of the present invention provides a light source beam combining structure and a light source module, which can overlap light energy when combining various monochromatic lights in the light source beam combining structure by setting the monochromatic lights with the same color to have at least two beams, so as to greatly improve the energy density of the final combined light source, and further improve the display brightness of the corresponding image; the number of the light sources of each color is flexibly combined, so that the light sources of different colors can be flexibly configured and adjusted according to the display requirements, and the requirements of different images on different single-color light brightness are met; the fixing mode of the LD laser is set to four-point welding, so that the stability of the LD laser is improved, the spacing distance between two adjacent LD lasers is reduced, the working distance of light paths of all incident light sources is synchronously reduced, and the light source coupling efficiency and the brightness of a beam combining light source are further improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A light source beam combining structure is characterized by comprising a shell and a focusing lens, wherein a second beam combining channel and a plurality of first beam combining channels are arranged in the shell, the second beam combining channel and the plurality of first beam combining channels are used for providing a working space for light source beam combining, each first beam combining channel is vertically communicated with the second beam combining channel, and the focusing lens is arranged at one end of the second beam combining channel;

at least one first light source beam combining and finishing component is arranged in each first beam combining channel, and a second light source beam combining and finishing component is arranged in the second beam combining channel at a position corresponding to each first beam combining channel, so that a beam combining light source combined in the second beam combining channel can be coincided with a main optical axis of the focusing lens; at least two first light sources incident to each first light source combining component are provided, the plane formed by the first light sources is a first plane, the plane formed by the first combined light beams of the first light sources combined on the first light source combining component and the plane formed by the combined light sources is a second plane, and the first plane is vertical to the second plane; at least two monochromatic lights of all the monochromatic lights incident on the plurality of first light source beam combining components have the same color.

2. The light source beam combining structure according to claim 1, wherein the first combined light of each first combined beam channel is perpendicular to the combined light source in the second combined beam channel, and two adjacent first light sources are perpendicular to each other;

the light source beam combining structure further comprises a plurality of collimating lenses, and the collimating lenses are fixed in the shell and correspond to the monochromatic light one by one.

3. The light source beam combining structure according to claim 2, wherein the first light source beam combining structure is a polarization beam splitter prism, and the second light source beam combining structure is a filter;

at least one of the first light sources corresponding to each first light source combination component has the same direction as the corresponding first combined light.

4. The light source beam combining structure according to claim 3, wherein the number of the first light sources corresponding to each first beam combining channel is two and is monochromatic light, and the monochromatic light at least comprises red light, green light and blue light.

5. The light source beam combining structure according to any one of claims 1 to 4, wherein the light source beam combining structure is further provided with an infrared light source beam combining channel, a corresponding collimating lens, and a light filter corresponding to the collimating lens, the infrared light source beam combining channel is vertically communicated with the second beam combining channel, the light filter is disposed in the second beam combining channel, and the collimating lens is disposed at an end of the infrared light source beam combining channel opposite to the light filter.

6. The light source beam combining structure according to claim 5, wherein the monochromatic light comprises blue light, green light, red light and infrared light in sequence from far to near according to the working distance of the light path; the light path working distance corresponds to the light path distance between each collimating lens and the focusing lens.

7. The light source beam combining structure according to claim 6, wherein the housing has a rectangular parallelepiped shape, and the main optical axis direction of the focusing lens is parallel to the length direction of the housing; the plurality of collimating lenses are arranged on the same side of the shell and are arranged in an array.

8. The light source beam combining structure according to claim 7, further comprising a plurality of LD lasers for providing the monochromatic light to the corresponding collimating lens, wherein the plurality of LD lasers are fixed to the housing and are adapted to the corresponding collimating lens;

the plurality of LD lasers sequentially comprise a blue light source laser, a green light source laser, a red light source laser and an infrared light source laser along the direction of the beam combining light source.

9. The light source beam combining structure according to claim 8, wherein each of the LD lasers is fixed by laser spot welding, and the number of the welding points of the laser spot welding is four, and a connection line formed by two opposite welding points forms an included angle of 45 degrees with the beam combining light source.

10. A light source module, comprising the light source beam combining structure according to any one of claims 1 to 9 and an optical fiber, wherein the optical fiber and the focusing lens form a focusing assembly, and the optical fiber is fixed at the beam combining light source output end of the focusing lens.

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