Multi-wavelength laser diode

Abstract

The utility model relates to a multi-wavelength laser diode. The multi-wavelength laser diode comprises a plurality of lasers and a beam combining prism which are arranged along a light path, the beam combining prism comprises at least two parallel partial reflection surfaces and a beam combining reflection surface parallel to the partial reflection surfaces; the number of the lasers is equal to that of the partial reflecting surfaces and the lasers and the partial reflecting surfaces are in one-to-one correspondence; and emergent light of the laser is reflected by the partial reflecting surface and then is output after being reflected and combined by the beam combining reflecting surface. According to the utility model, the beam combining prism with an integrated structure is adopted to couple light beams, and a plurality of traditional lens groups are replaced, so that the size and the installation and adjustment difficulty of the module are greatly reduced; the coupling efficiency and consistency of the multi-wavelength optical fiber are improved; smaller space volume and compactness are beneficial to the structural stability and heat dissipation performance of the module; and meanwhile, large-scale automatic production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, in particular to a multi-wavelength laser diode. Background Art

[0002] With the rapid advancement of laser technology, many fields are gradually turning to the application of laser light sources. Compared with traditional LED light sources, lasers stand out for their excellent performance. Lasers not only have higher brightness and can provide bright and clear lighting effects at a longer distance, but also have better monochromaticity and directionality, which makes laser light sources show great potential in many fields. In addition, the size of laser light sources is relatively small, which is more in line with the requirements of modern equipment for compactness, further broadening its application scenarios.

[0003] However, it is worth noting that the internal structure of most multi-wavelength laser diode light source modules is quite complicated. These modules usually contain many precision optical components, such as fast-axis collimating lenses, slow-axis collimating lenses, shaping lenses, dichroic mirrors, homogenizing lenses, and steering prisms. Especially in multi-wavelength laser diode light source modules with optical fiber output, additional coupling mirrors are required. These complex structures not only make the module relatively large, but also particularly cumbersome when adjusting the coupling process. This complex structure and adjustment process reduce the stability and reliability of the module to a certain extent, and bring certain challenges to practical applications.

[0004] Multi-wavelength laser diodes include laser beam combining technology, which is an important technology in the field of optics and involves the effective integration of lasers of different wavelengths. In practical applications, there are three main beam combining methods: prism beam combining, waveguide beam combining, and dichroic mirror beam combining.

[0005] First, the prism beam combining method relies on the refraction principle of the prism to achieve laser beam combining. However, this method has extremely high requirements for the debugging accuracy of the incident angle. Once the angle is slightly deviated, it may cause the laser to be dispersed or lost, greatly affecting the beam combining effect.

[0006] Secondly, the waveguide beam combining method utilizes the structural characteristics of on-chip silicon waveguides. Although this method has certain innovations in design, its complex design and high loss have limited its practical application.

[0007] However, thanks to the excellent wavelength selectivity and increasingly mature coating technology of dichroic mirrors, the dichroic mirror beam combining method has become the industry's first choice. Dichroic mirrors can accurately select and combine lasers of different wavelengths to ensure the stability and consistency of the beam.

[0008] However, as the number of combined laser beams increases, the coupling process also faces huge challenges. In the overall optical path, the more laser beams that need to be combined, the more lenses are needed. This not only introduces more coupling tolerances, resulting in reduced coupling efficiency, but also increases the time and cost of the process. How to achieve efficient coupling of multiple laser beams while ensuring coupling efficiency has become an urgent problem to be solved in the industry.

[0009] In addition, the traditional optical path structure has the problem of being bulky. Since each lens requires a fixed base and a coupling fixture for clamping and debugging, the overall optical path is relatively large. This not only makes it difficult to further reduce the size of the optical machine, but also limits its application in portable devices. Utility Model Content

[0010] In order to solve the above problems in the prior art, the utility model provides a multi-wavelength laser diode.

[0011] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0012] A multi-wavelength laser diode comprises a plurality of lasers and a beam combining prism arranged along an optical path; the beam combining prism comprises at least two parallel partially reflecting surfaces and a beam combining reflecting surface parallel to the partially reflecting surfaces; the number of the lasers is equal to the number of the partially reflecting surfaces and corresponds one to one; the output light of the lasers is reflected by the partially reflecting surfaces and then reflected and combined by the beam combining reflecting surfaces before being output.

[0013] Furthermore, the beam-combining prism includes two partial reflection surfaces, which are respectively a first partial reflection surface and a second partial reflection surface from bottom to top; the laser includes a first laser arranged opposite to the first partial reflection surface and a second laser arranged opposite to the second partial reflection surface; the first partial reflection surface can reflect the first wavelength light emitted by the first laser; the second partial reflection surface can reflect the second wavelength light emitted by the second laser and transmit the first wavelength light; the beam-combining reflection surface can reflect the first wavelength light and the second wavelength light.

[0014] Furthermore, the beam-combining prism includes three partial reflection surfaces, which are respectively a first partial reflection surface, a second partial reflection surface, and a third partial reflection surface from bottom to top; the laser includes a first laser arranged opposite to the first partial reflection surface, a second laser arranged opposite to the second partial reflection surface, and a third laser arranged opposite to the third partial reflection surface; the first partial reflection surface can reflect the first wavelength light emitted by the first laser; the second partial reflection surface can reflect the second wavelength light emitted by the second laser and transmit the first wavelength light; the third partial reflection surface can reflect the third wavelength light emitted by the third laser and transmit the first wavelength light and the second wavelength light; the beam-combining reflection surface can reflect the first wavelength light, the second wavelength light, and the third wavelength light.

[0015] Furthermore, the angle between the partial reflection surface and the horizontal plane is 45°, and the output light of the laser is horizontally emitted.

[0016] Furthermore, the beam-combining prism is a cylindrical lens of an integrated structure; the cylindrical lens comprises at least two prisms spliced ​​in sequence from bottom to top; the splicing point of the prisms and the lower end of the integrated cylindrical lens are provided with a partial reflection film to form a partial reflection surface, and the upper end of the integrated cylindrical lens is provided with a total reflection film to form a beam-combining reflection surface.

[0017] Furthermore, the beam-combining prism is a cylindrical lens of an integrated structure; the cylindrical lens comprises at least two prisms spliced ​​in sequence from bottom to top; a dichroic mirror is provided at the splicing point of the prisms and at the bottom end of the integrated cylindrical lens to form a partial reflection surface, and a reflector is provided at the top end of the integrated cylindrical lens to form a beam-combining reflection surface; the dichroic mirrors are respectively glued to the adjacent prisms.

[0018] Furthermore, a supporting lens is arranged at the bottom of the beam combining prism so that the lower bottom surface of the beam combining lens is flush with the horizontal plane.

[0019] Furthermore, the output light of the laser is reflected by a partial reflection surface, then reflected and combined by a beam combining reflection surface, and then collimated and outputted through a collimating lens arranged at the light outlet of the beam combining prism.

[0020] The beneficial effects of the utility model are:

[0021] (1) An integrated beam-combining prism is used to couple the light beams, replacing several traditional lens groups, greatly reducing the size of the module and the difficulty of assembly and adjustment; improving the efficiency and consistency of multi-wavelength fiber coupling; smaller space volume and compactness are beneficial to the structural stability and heat dissipation performance of the module; and facilitating large-scale automated production;

[0022] (2) Through reasonable optical path design, a beam combining prism is used to form an integrated optical path structure, which greatly reduces the tolerance caused by the coupling process and the time required for coupling, improves the stability of the optical path, and can achieve the purpose of coupling multiple laser beams into one optical fiber at a certain coupling efficiency;

[0023] (3) The integrated beam-combining prism is designed as a cylindrical lens, which can reduce the spot size of the output light and make it easier to couple into the optical fiber; the supporting lens ensures that the beam-combining prism has a flat bottom surface, making it easier to install when it is fixed;

[0024] (4) The lasers are independently controlled and can be applied to multi-color scanning systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the optical path of the first embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the structure of a beam-combining prism in Embodiment 1 of the utility model;

[0028] Figure 3 This is a schematic diagram of the optical path of the second embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the structure of a dual-beam prism according to an embodiment of the utility model;

[0030] Description of reference numerals:

[0031] 100, beam-combining prism; 110, partial reflection surface; 111, first partial reflection surface; 112, second partial reflection surface; 113, third partial reflection surface; 120, beam-combining reflection surface; 130, supporting lens; 200, laser; 210, first laser; 211, first wavelength light; 220, second laser; 221, second wavelength light; 230, third laser; 231, third wavelength light; 300, collimating lens. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] A multi-wavelength laser diode comprises a plurality of lasers 200 and a beam combining prism 100 arranged along an optical path; the beam combining prism 100 comprises at least two parallel partially reflecting surfaces 110 and a beam combining reflecting surface 120 arranged parallel to the partially reflecting surfaces 110; the number of the lasers 200 is equal to the number of the partially reflecting surfaces 110 and corresponds one to one; the output light of the lasers 200 is reflected by the partially reflecting surfaces 110 and then reflected by the beam combining reflecting surface 120 before being output.

[0036] Embodiment 1, as Figure 1-2As shown; the beam combining prism 100 includes two partial reflection surfaces 110, which are respectively a first partial reflection surface 111 and a second partial reflection surface 112 from bottom to top; the laser 200 includes a first laser 210 arranged opposite to the first partial reflection surface 111 and a second laser 220 arranged opposite to the second partial reflection surface 112; the angle between the partial reflection surface 110 and the horizontal plane is 45°, and the output light of the laser 200 is horizontally emitted; the beam combining prism 100 is a cylindrical lens of an integrated structure; the cylindrical lens includes two prisms spliced ​​in sequence from bottom to top; the splicing part of the prism and the lower end of the cylindrical lens of the integrated structure are both provided with a partial reflection film or a dichroic mirror to form a partial reflection surface 110; the upper end of the cylindrical lens of the integrated structure is provided with a total reflection The beam combining prism 100 is configured as an integrated structure to realize large-scale automated production, and replaces several traditional lens groups, thereby reducing the volume and reducing the difficulty of assembly and adjustment, ensuring the efficiency and consistency of multi-wavelength optical fiber coupling, and the small volume is also conducive to structural stability and uniform heat dissipation; when the partial reflection surface 110 is composed of a dichroic mirror, the dichroic mirror and the prism are glued together, and UV glue is used for gluing; the first partial reflection surface 111 can reflect the first wavelength light 211 emitted by the first laser 210; the second partial reflection surface 112 can reflect the second wavelength light 221 emitted by the second laser 220 and transmit the first wavelength light 211; the beam combining reflection surface 120 can reflect the first wavelength light 211 and the second wavelength light 221; therefore, Figure 1 In the optical path, the first wavelength light 211 and the second wavelength light 221 can be combined and output after being reflected by the beam combining reflection surface 120, and the stray light of other wavelengths can also be filtered out by using the first partial reflection surface 111 and the second partial reflection surface 112; the cylindrical lens of the integrated structure can reduce the spot of the final output light and reduce the coupling difficulty; further, it is preferred to set a collimating lens 300 at the light outlet of the beam combining prism 100 to achieve collimated output and improve the light output quality;

[0037] In one embodiment, since the cylindrical lens includes two prisms spliced ​​in sequence from bottom to top, a partial reflection film or a dichroic mirror needs to be set at the bottom of the cylindrical lens of the integrated structure, and the angle between the partial reflection surface 110 and the horizontal plane is 45°. Therefore, the angle between the bottom of the cylindrical lens of the integrated structure and the horizontal plane is also 45°, resulting in the bottom of the beam-combining prism 100 being a non-flat structure, which increases the difficulty of assembly to a certain extent. Therefore, a supporting lens 130 is set at the bottom of the beam-combining prism 100 to make the lower bottom surface of the beam-combining lens flush with the horizontal plane, thereby reducing the difficulty of assembly; similarly, a top lens can be set on the top of the beam-combining reflection surface 120 to make its top flush with the horizontal plane, which is conducive to assembly.

[0038] Embodiment 2, as Figure 3-4As shown; the beam combining prism 100 includes three partial reflection surfaces 110, which are respectively a first partial reflection surface 111, a second partial reflection surface 112, and a third partial reflection surface 113 from bottom to top; the laser 200 includes a first laser 210 arranged opposite to the first partial reflection surface 111, a second laser 220 arranged opposite to the second partial reflection surface 112, and a third laser 230 arranged opposite to the third partial reflection surface 113; the first partial reflection surface 111 can reflect the first wavelength light 211 emitted by the first laser 210; the second partial reflection surface 112 can reflect the second wavelength light 221 emitted by the second laser 220 and transmit the first wavelength light 211; the third partial reflection surface 113 can reflect the third wavelength light 230 emitted by the third laser 230 1 and transmits the first wavelength light 211 and the second wavelength light 221; the beam combining reflection surface 120 can reflect the first wavelength light 211, the second wavelength light 221 and the third wavelength light 231; the angle between the partial reflection surface 110 and the horizontal plane is 45°, and the output light of the laser 200 is horizontally emitted; the beam combining prism 100 is a cylindrical lens of an integrated structure; the cylindrical lens includes three prisms spliced ​​in sequence from bottom to top; the splicing part of the prism and the lower end of the cylindrical lens of the integrated structure are both provided with a partial reflection film or a dichroic mirror to form the partial reflection surface 110; the upper end of the cylindrical lens of the integrated structure is provided with a total reflection film or a reflection mirror to form the beam combining reflection surface 120; when the partial reflection surface 110 is composed of a dichroic mirror, the dichroic mirror is glued to the prism, and the gluing adopts UV glue;

[0039] In one embodiment, since the cylindrical lens includes three prisms spliced ​​in sequence from bottom to top, a partial reflection film or a dichroic mirror needs to be set at the bottom of the cylindrical lens of the integrated structure, and the angle between the partial reflection surface 110 and the horizontal plane is 45°. Therefore, the angle between the bottom of the cylindrical lens of the integrated structure and the horizontal plane is also 45°, resulting in the bottom of the beam-combining prism 100 being a non-flat structure, which increases the difficulty of assembly to a certain extent. Therefore, a supporting lens 130 is set at the bottom of the beam-combining prism 100 to make the lower bottom surface of the beam-combining lens flush with the horizontal plane, thereby reducing the difficulty of assembly; similarly, a top lens can be set on the top of the beam-combining reflection surface 120 to make its top flush with the horizontal plane, which is conducive to assembly.

[0040] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A multi-wavelength laser diode, characterized in that: The invention comprises a plurality of lasers (200) and a beam combining prism (100) arranged along an optical path; the beam combining prism (100) comprises at least two parallel arranged partial reflection surfaces (110) and a beam combining reflection surface (120) parallel to the partial reflection surface (110); the number of the lasers (200) is equal to the number of the partial reflection surfaces (110) and corresponds one to one; the output light of the lasers (200) is reflected by the partial reflection surface (110) and then reflected and combined by the beam combining reflection surface (120) before being output.

2. A multi-wavelength laser diode according to claim 1, characterized in that: The beam combining prism (100) comprises two partial reflection surfaces (110), which are respectively a first partial reflection surface (111) and a second partial reflection surface (112) from bottom to top; the laser (200) comprises a first laser (210) arranged opposite to the first partial reflection surface (111) and a second laser (220) arranged opposite to the second partial reflection surface (112); the first partial reflection surface (111) is capable of reflecting a first wavelength light (211) emitted by the first laser (210); the second partial reflection surface (112) is capable of reflecting a second wavelength light (221) emitted by the second laser (220) and transmitting the first wavelength light (211); the beam combining reflection surface (120) is capable of reflecting the first wavelength light (211) and the second wavelength light (221).

3. The multi-wavelength laser diode according to claim 1, characterized in that: The beam combining prism (100) comprises three partial reflection surfaces (110), which are respectively a first partial reflection surface (111), a second partial reflection surface (112), and a third partial reflection surface (113) from bottom to top; the laser (200) comprises a first laser (210) arranged opposite to the first partial reflection surface (111), a second laser (220) arranged opposite to the second partial reflection surface (112), and a third laser (230) arranged opposite to the third partial reflection surface (113); the first partial reflection surface (111) is capable of reflecting the first The invention relates to a first wavelength light (211) emitted by a laser (210); the second partial reflection surface (112) is capable of reflecting the second wavelength light (221) emitted by the second laser (220) and transmitting the first wavelength light (211); the third partial reflection surface (113) is capable of reflecting the third wavelength light (231) emitted by the third laser (230) and transmitting the first wavelength light (211) and the second wavelength light (221); and the beam combining reflection surface (120) is capable of reflecting the first wavelength light (211), the second wavelength light (221) and the third wavelength light (231).

4. A multi-wavelength laser diode according to claim 2 or 3, characterized in that: The angle between the partial reflection surface (110) and the horizontal plane is 45°, and the output light of the laser (200) is horizontally output.

5. The multi-wavelength laser diode according to claim 1, characterized in that: The beam-combining prism (100) is a cylindrical lens of an integral structure; the cylindrical lens comprises at least two prisms spliced ​​in sequence from bottom to top; the splicing point of the prisms and the bottom end of the cylindrical lens of the integral structure are both provided with a partial reflection film to form a partial reflection surface (110), and the top end of the cylindrical lens of the integral structure is provided with a total reflection film to form a beam-combining reflection surface (120).

6. The multi-wavelength laser diode according to claim 1, characterized in that: The beam-combining prism (100) is a cylindrical lens of an integral structure; the cylindrical lens comprises at least two prisms spliced ​​in sequence from bottom to top; a dichroic mirror is provided at the splicing point of the prisms and at the bottom end of the cylindrical lens of the integral structure to form a partial reflection surface (110); a reflection mirror is provided at the top end of the cylindrical lens of the integral structure to form a beam-combining reflection surface (120); and the dichroic mirrors are respectively glued to adjacent prisms.

7. A multi-wavelength laser diode according to claim 5 or 6, characterized in that: A supporting lens (130) is arranged at the bottom of the beam combining prism (100) so that the lower bottom surface of the beam combining lens is flush with the horizontal plane.

8. The multi-wavelength laser diode according to claim 1, characterized in that: The output light of the laser (200) is reflected by the partial reflection surface (110), then reflected and combined by the beam combining reflection surface (120), and then collimated and outputted through a collimating lens (300) arranged at the light outlet of the beam combining prism (100).

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