Multi-wavelength beam-combining laser coupling system

Abstract

The utility model relates to a multi-wavelength beam-combining laser coupling system, which comprises a first laser module, a second laser module and a third laser module which respectively emit laser beams with wavelengths of A, B and C; the first beam combining unit is used for combining the laser beams with the wavelengths of A and B into first combined light; the second beam combining unit is used for combining the first combined beam light and the laser beam with the wavelength of C into second combined beam light; a convergence unit and a single-core optical fiber, wherein the convergence unit is used for coupling the second combined beam light to the single-core optical fiber; and the first laser module, the second laser module and the third laser module are positioned on the same side of the axial direction of the single-core optical fiber. The multi-wavelength beam-combining laser coupling system combines laser beams emitted by a plurality of laser diodes and then couples the combined laser beams to the single-core optical fiber through the convergence unit, so that the multi-wavelength beam-combining laser coupling system has the advantages of few used optical elements, small system size and compact structure while obtaining higher coupling efficiency and output optical power.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor lasers, in particular to a multi-wavelength beam combining laser coupling system. Background Art

[0002] The output beam of the laser diode has an elliptical energy distribution and astigmatism. Generally, after being collimated in the vertical direction, there is still a residual divergence angle in the horizontal direction. When coupled to the optical fiber through a converging lens, the size of the converged light spot is limited by the residual divergence angle, making it difficult for the coupled light spot to enter the thinner optical fiber, affecting the coupling efficiency and the optical power output of the optical fiber.

[0003] In order to increase the output optical power, it is generally necessary to use multiple laser diodes for fiber coupling. Due to the physical size and installation size limitations, the output beams of the laser diodes are spaced apart from each other, and the converging lens has a physical aperture limitation, which limits the number of received beams and the spot size. Moreover, when the beam spacing is too large, the numerical aperture of the converging beam is too large and cannot be fully coupled into the optical fiber.

[0004] Therefore, in order to obtain high-power coupled output, higher requirements are placed on the arrangement of laser diodes, the layout of optical components, and the size and compactness of the system, which is a problem that technical personnel in this field currently need to solve. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the problem in the prior art of sacrificing system size and compactness in order to obtain high-power coupled output, and to provide a multi-wavelength beam combining laser coupling system, which can achieve high coupling efficiency and output optical power while having the advantages of using a small number of optical elements, a small system size and a compact structure.

[0006] In order to solve the above technical problems, the utility model provides a multi-wavelength beam combining laser coupling system, comprising:

[0007] A first laser module, used for emitting a laser beam with a wavelength A;

[0008] A second laser module is used to emit a laser beam with a wavelength of B;

[0009] A first beam combining unit, used for combining the laser beam with wavelength A and the laser beam with wavelength B into a first combined beam;

[0010] A third laser module is used to emit a laser beam with a wavelength of C;

[0011] A second beam combining unit, used for combining the first combined light beam and the laser beam with the wavelength C into a second combined light beam;

[0012] A converging unit and a single-core optical fiber, wherein the converging unit is used to couple the second combined light beam to the single-core optical fiber;

[0013] The axial direction of the single-core optical fiber is defined as a first direction, and a direction perpendicular to the first direction is defined as a second direction; the first laser module, the second laser module and the third laser module are located on the same side of the first direction.

[0014] In one embodiment of the present invention, the arrangement direction of the optical units included in the first laser module is parallel to the second direction, and the arrangement direction of the optical units included in the second laser module and the arrangement direction of the optical units included in the third laser module are both parallel to the first direction.

[0015] In one embodiment of the present utility model, the first laser module comprises:

[0016] A first emitting unit, used for emitting the laser beam with a wavelength A;

[0017] A first collimating unit, used for collimating the laser beam emitted by the first emitting unit;

[0018] The first reflecting unit is used to reflect the laser beam collimated by the first collimating unit.

[0019] In one embodiment of the present invention, the first emitting unit has a plurality of blue laser diodes sequentially placed along the first direction;

[0020] The first collimating unit has a plurality of groups of collimating lenses, respectively corresponding to the plurality of blue laser diodes;

[0021] The first reflection unit has a plurality of micro-reflectors, which respectively correspond to the plurality of groups of collimating lenses; wherein the plurality of groups of collimating lenses each have a fast-axis cylindrical lens and a slow-axis cylindrical lens, and the fast-axis cylindrical lens is connected to the corresponding blue laser diode.

[0022] In one embodiment of the present utility model, the second laser module comprises:

[0023] A second emitting unit, used for emitting the laser beam with a wavelength of B;

[0024] The second reflecting unit is used to reflect the laser beam emitted by the second emitting unit.

[0025] In one embodiment of the present invention, the second emitting unit has a plurality of green laser diodes sequentially placed along the second direction;

[0026] The second reflection unit has a plurality of micro-mirrors corresponding to the plurality of green laser diodes respectively.

[0027] In one embodiment of the present invention, the first beam combining unit is a first beam combining mirror, which is used to combine the laser beam with wavelength A and the laser beam with wavelength B into a first combined beam of light.

[0028] In one embodiment of the present utility model, the third laser module comprises:

[0029] A third emitting unit, configured to emit the laser beam having a wavelength C;

[0030] A second collimating unit, used for collimating the laser beam emitted by the third emitting unit;

[0031] The third reflecting unit is used to reflect the laser beam collimated by the second collimating unit.

[0032] In one embodiment of the present utility model, the third emitting unit has a plurality of red laser diodes sequentially placed along the second direction;

[0033] The second collimating unit has a plurality of groups of collimating lenses corresponding to the plurality of red laser diodes respectively;

[0034] The third reflection unit has a plurality of micro-reflectors corresponding to the plurality of collimating lens groups respectively; wherein the plurality of collimating lens groups each have a fast-axis cylindrical lens and a slow-axis cylindrical lens, and the fast-axis cylindrical lens is connected to the corresponding red laser diode.

[0035] In one embodiment of the present utility model, the second beam combining unit is a second beam combining mirror, which is used to combine the first combined light beam with the laser beam with wavelength C into a second combined light beam;

[0036] The converging unit is a converging lens, which is used to couple the second combined light beam to the single-core optical fiber.

[0037] The above technical solution of the utility model has at least the following advantages compared with the prior art:

[0038] The utility model provides a multi-wavelength beam-combining laser coupling system, which combines laser beams emitted by multiple laser diodes and couples them to a single-core optical fiber through a converging unit, thereby achieving higher coupling efficiency and output optical power while having the advantages of using fewer optical elements, small system size and compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0040] Figure 1 It is a three-dimensional schematic diagram of a laser coupling system for multi-wavelength beam combining in an embodiment of the utility model;

[0041] Figure 2 It is a top view schematic diagram of a laser coupling system for multi-wavelength beam combining in an embodiment of the utility model;

[0042] Figure 3 It is a front view schematic diagram of a laser coupling system for multi-wavelength beam combining in an embodiment of the utility model.

[0043] Description of the Figures in the Specification:

[0044] S1 first laser module; 101, 102 blue laser diodes; 111, 112 fast axis cylindrical lenses; 121, 122 slow axis cylindrical lenses; 131, 132 micro mirrors;

[0045] S2 second laser module; 201, 202, 203, 304 green laser diodes; 211, 212, 213, 214 micro mirrors;

[0046] S3 third laser module; 301, 302, 303, 304 red laser diodes; 311, 312, 313, 314 fast axis cylindrical lenses; 321, 322, 323, 324 slow axis cylindrical lenses; 331, 332, 333, 334 micro mirrors;

[0047] S4 first beam combining mirror; S5 second beam combining mirror; S6 converging lens; S7 single core optical fiber;

[0048] X is the first direction; Y is the second direction. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0050] This embodiment provides a multi-wavelength laser coupling system, including:

[0051] A first laser module, used for emitting a laser beam with a wavelength A;

[0052] A second laser module is used to emit a laser beam with a wavelength of B;

[0053] A first beam combining unit, used for combining the laser beam with wavelength A and the laser beam with wavelength B into a first combined beam;

[0054] A third laser module is used to emit a laser beam with a wavelength of C;

[0055] A second beam combining unit, used for combining the first combined light beam and the laser beam with the wavelength C into a second combined light beam;

[0056] A converging unit and a single-core optical fiber, wherein the converging unit is used to couple the second combined light beam to the single-core optical fiber;

[0057] The axial direction of the single-core optical fiber is defined as a first direction, and a direction perpendicular to the first direction is defined as a second direction; the first laser module, the second laser module and the third laser module are located on the same side of the first direction.

[0058] This embodiment provides a multi-wavelength beam-combining laser coupling system to combine laser beams emitted by multiple laser diodes, and then couples them to a single-core optical fiber through a converging unit, thereby achieving higher coupling efficiency and output optical power while having the advantages of using fewer optical elements, small system size and compact structure.

[0059] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0060] This embodiment provides a multi-wavelength laser coupling system, the three-dimensional schematic diagram of the system is as follows Figure 1 As shown; the top view schematic diagram of the system is as shown Figure 2 As shown, in Figure 2 The optical elements used in this embodiment are fully marked; Figure 3 is a front view schematic diagram of the system, combined with Figure 1 and Figure 2 , it can be seen that the optical elements are compact in arrangement and layout.

[0061] The axial direction of the single-core optical fiber S7 is defined as a first direction X, and a direction perpendicular to the first direction is defined as a second direction Y; the first laser module S1 , the second laser module S2 , and the third laser module S3 are located on the same side of the first direction X.

[0062] The first laser module S1 is used to emit blue light and comprises:

[0063] A first emitting unit, comprising two blue laser diodes 101 and 102, which are sequentially placed along the first direction X and are used to emit blue light;

[0064] A first collimating unit, comprising two groups of collimating lenses, namely a first group of collimating lenses consisting of a fast axis cylindrical lens 111 and a slow axis cylindrical lens 121, and a second group of collimating lenses consisting of a fast axis cylindrical lens 112 and a slow axis cylindrical lens 122, for collimating the blue light emitted by the first emitting unit;

[0065] Wherein, the first group of collimating lenses and the second group of collimating lenses correspond to the blue laser diodes 101 and 102, respectively;

[0066] The fast axis cylindrical lens 111 is connected to the blue laser diode 101 , and the fast axis cylindrical lens 112 is connected to the blue laser diode 102 ;

[0067] A first reflecting unit has two micro-reflectors 131 and 132, which correspond to the first group of collimating lenses and the second group of collimating lenses respectively, and are used to reflect the blue light collimated by the first collimating unit;

[0068] The arrangement direction of the first emitting unit, the first collimating unit and the first reflecting unit is parallel to the second direction Y, and the composed first laser module S1 has compact arrangement layout.

[0069] The second laser module S2 is used to emit green light and comprises:

[0070] A second emitting unit, comprising four green laser diodes 201, 202, 203 and 204, which are sequentially arranged along the second direction Y and are used to emit green light;

[0071] A second reflecting unit has four micro-reflectors 211, 212, 213 and 214, which correspond to the micro-reflectors 211, 212, 213 and 214 respectively, and are used to reflect the green light emitted by the second emitting unit;

[0072] The arrangement direction of the second emitting unit and the second reflecting unit is parallel to the first direction X, and the second laser module S2 formed thereby has a compact arrangement layout.

[0073] A first beam combining unit S4, used for combining the blue light and the green light into a first combined light beam;

[0074] Specifically, the first beam combining unit S4 is a first beam combining mirror, which combines the blue light reflected by the micro-mirrors 131 and 132 and the green light reflected by the micro-mirrors 211, 212, 213 and 214 to obtain a first combined light beam, thereby providing a basis for subsequent beam combining and improving coupling efficiency.

[0075] The third laser module S3 is used to emit red light, including:

[0076] A third emitting unit, comprising four red laser diodes 301, 302, 303 and 304, which are sequentially arranged along the second direction Y and are used to emit red light;

[0077] A second collimating unit has four groups of collimating lenses, which are a third group of collimating lenses consisting of a fast-axis cylindrical lens 311 and a slow-axis cylindrical lens 321, a fourth group of collimating lenses consisting of a fast-axis cylindrical lens 312 and a slow-axis cylindrical lens 322, a fifth group of collimating lenses consisting of a fast-axis cylindrical lens 313 and a slow-axis cylindrical lens 323, and a sixth group of collimating lenses consisting of a fast-axis cylindrical lens 314 and a slow-axis cylindrical lens 324, for collimating the red light emitted by the third emitting unit;

[0078] The third group of collimating lenses, the fourth group of collimating lenses, the fifth group of collimating lenses and the sixth group of collimating lenses correspond to the red laser diodes 301, 302, 303 and 304 respectively;

[0079] The fast axis cylindrical lens 311 is connected to the red laser diode 301, the fast axis cylindrical lens 312 is connected to the red laser diode 302, the fast axis cylindrical lens 313 is connected to the red laser diode 303, and the fast axis cylindrical lens 314 is connected to the red laser diode 304;

[0080] A third reflecting unit has four micro-reflectors 331, 332, 333 and 334, which correspond to the third group of collimating lenses, the fourth group of collimating lenses, the fifth group of collimating lenses and the sixth group of collimating lenses, respectively, and are used to reflect the red light collimated by the second collimating unit;

[0081] The arrangement direction of the third emitting unit, the second collimating unit and the third reflecting unit is parallel to the first direction X, and the third laser module S3 formed by them has compact arrangement layout.

[0082] A second beam combining unit S5, used for combining the first combined light beam and the red light into a second combined light beam;

[0083] Specifically, the second beam combining unit S5 is a second beam combining mirror, which combines the first combined light beam combined by the first beam combining mirror and the red light reflected by the micro-reflectors 331, 332, 333 and 334 to obtain a second combined light beam with a smaller spot size, thereby providing a basis for subsequent coupling and improving coupling efficiency.

[0084] A converging unit S6, used for coupling the second combined light beam to the single-core optical fiber S7;

[0085] Specifically, the converging unit S6 is a converging lens. Since the spot size of the second combined light beam is small, a small-aperture converging lens can be used to provide a basis for coupling into a small-diameter single-core optical fiber S7, thereby improving coupling efficiency and reducing optical loss.

[0086] In summary, this embodiment provides a multi-wavelength laser coupling system, which combines the laser beams emitted by multiple laser diodes and then couples them to a single-core optical fiber through a converging unit, thereby achieving higher coupling efficiency and output optical power while having the advantages of using a small number of optical components, a small system size and a compact structure.

[0087] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A multi-wavelength beam combining laser coupling system, characterized in that: include: A first laser module, used for emitting a laser beam with a wavelength A; A second laser module is used to emit a laser beam with a wavelength of B; A first beam combining unit, used for combining the laser beam with wavelength A and the laser beam with wavelength B into a first combined beam; A third laser module is used to emit a laser beam with a wavelength of C; A second beam combining unit, used for combining the first combined light beam and the laser beam with the wavelength C into a second combined light beam; A converging unit and a single-core optical fiber, wherein the converging unit is used to couple the second combined light beam to the single-core optical fiber; The axial direction of the single-core optical fiber is defined as a first direction, and a direction perpendicular to the first direction is defined as a second direction; the first laser module, the second laser module and the third laser module are located on the same side of the first direction.

2. The multi-wavelength beam combining laser coupling system according to claim 1, characterized in that: The arrangement direction of the optical units included in the first laser module is parallel to the second direction, and the arrangement directions of the optical units included in the second laser module and the arrangement directions of the optical units included in the third laser module are both parallel to the first direction.

3. The multi-wavelength beam combining laser coupling system according to claim 1 or 2, characterized in that: The first laser module comprises: A first emitting unit, used for emitting the laser beam with a wavelength A; A first collimating unit, used for collimating the laser beam emitted by the first emitting unit; The first reflecting unit is used to reflect the laser beam collimated by the first collimating unit.

4. The multi-wavelength beam combining laser coupling system according to claim 3, characterized in that: The first emitting unit has a plurality of blue laser diodes sequentially placed along the first direction; The first collimating unit has a plurality of groups of collimating lenses, respectively corresponding to the plurality of blue laser diodes; The first reflection unit has a plurality of micro-reflectors, which respectively correspond to the plurality of groups of collimating lenses; wherein the plurality of groups of collimating lenses each have a fast-axis cylindrical lens and a slow-axis cylindrical lens, and the fast-axis cylindrical lens is connected to the corresponding blue laser diode.

5. The multi-wavelength beam combining laser coupling system according to claim 1 or 2, characterized in that: The second laser module comprises: A second emitting unit, used for emitting the laser beam with a wavelength of B; The second reflecting unit is used to reflect the laser beam emitted by the second emitting unit.

6. The multi-wavelength beam combining laser coupling system according to claim 5, characterized in that: The second emitting unit comprises a plurality of green laser diodes sequentially placed along the second direction; The second reflection unit has a plurality of micro-mirrors corresponding to the plurality of green laser diodes respectively.

7. The multi-wavelength beam combining laser coupling system according to claim 1 or 2, characterized in that: The first beam combining unit is a first beam combining mirror, which is used to combine the laser beam with wavelength A and the laser beam with wavelength B into a first combined beam.

8. The multi-wavelength beam combining laser coupling system according to claim 1 or 2, characterized in that: The third laser module comprises: A third emitting unit, configured to emit the laser beam having a wavelength C; A second collimating unit, used for collimating the laser beam emitted by the third emitting unit; The third reflecting unit is used to reflect the laser beam collimated by the second collimating unit.

9. The multi-wavelength beam combining laser coupling system according to claim 8, characterized in that: The third emitting unit comprises a plurality of red laser diodes sequentially placed along the second direction; The second collimating unit has a plurality of groups of collimating lenses corresponding to the plurality of red laser diodes respectively; The third reflection unit has a plurality of micro-reflectors corresponding to the plurality of collimating lens groups respectively; wherein the plurality of collimating lens groups each have a fast-axis cylindrical lens and a slow-axis cylindrical lens, and the fast-axis cylindrical lens is connected to the corresponding red laser diode.

10. The multi-wavelength beam combining laser coupling system according to claim 1 or 2, characterized in that: The second beam combining unit is a second beam combining mirror, which is used to combine the first combined light beam with the laser beam with wavelength C into a second combined light beam; The converging unit is a converging lens, which is used to couple the second combined light beam to the single-core optical fiber.

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