Laser beam combining module

Abstract

The utility model is suitable for the technical field of laser beam combining modules, and provides a laser beam combining module which comprises a shell and a wavelength division multiplexing part, and a containing cavity is formed in the shell; the wavelength division multiplexing part comprises a plurality of wavelength division multiplexing components, each wavelength division multiplexing component is provided with two laser input ends and a combined laser output end, the plurality of wavelength division multiplexing components are sequentially arranged in the accommodating cavity, the combined laser output end of the former wavelength division multiplexing component is communicated with one of the two laser input ends of the latter wavelength division multiplexing component, and the combined laser output end of the latter wavelength division multiplexing component is communicated with the other one of the two laser input ends of the latter wavelength division multiplexing component. And the laser input end which is not communicated with the combined laser output end is communicated with external laser input equipment. Compared with a multi-wavelength laser beam combining module in the prior art, the laser beam combining module provided by the utility model does not need to use a filter device during laser beam combining, and the power attenuation is relatively low.

Description

Technical Field

[0001] The present application belongs to the technical field of laser beam combining modules, and more specifically, relates to a laser beam combining module. Background Art

[0002] The red, green, and blue (RGB) multi-wavelength laser beam combining module is a device that combines multiple laser signals into a single-mode optical fiber for output. The red, green, and blue (RGB) multi-wavelength laser beam combining module is widely used in laser display, material processing, medical treatment, scientific research experiments, laser lighting, military, 3D printing, optical measurement and other fields, among which it is used in projection display equipment to achieve high-brightness and high-color saturation image display. The existing red, green, and blue (RGB) multi-wavelength laser beam combining modules mostly use filter devices to achieve beam combining.

[0003] However, in a red, green and blue (RGB) multi-wavelength laser beam combining module using a filter device, the power attenuation of the optical signal after beam combining is very large, and more than 50% of the optical power is lost. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a laser beam combining module, aiming to solve the technical problem of large power attenuation after beam combining in the red, green and blue (RGB) multi-wavelength laser beam combining module in the prior art.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present application, a laser beam combining module is provided, which includes: a shell and a wavelength division multiplexing part, wherein a housing cavity is arranged in the shell; the wavelength division multiplexing part includes a plurality of wavelength division multiplexing components, the wavelength division multiplexing component has two laser input ends and a beam combining laser output end, and the plurality of wavelength division multiplexing components are sequentially arranged in the housing cavity, the beam combining laser output end of the previous wavelength division multiplexing component is connected to one of the two laser input ends of the next wavelength division multiplexing component, and the laser input end not connected to the beam combining laser output end is connected to an external laser input device.

[0006] Optionally, the wavelength division multiplexing component includes a wavelength division multiplexing body, a first input optical fiber, a second input optical fiber and an output optical fiber. The first input optical fiber, the second input optical fiber and the output optical fiber are all arranged on the wavelength division multiplexing body and are respectively connected to the wavelength division multiplexing body; the first input optical fiber and the second input optical fiber respectively form two laser input ends, and the output optical fiber forms a combined laser output end.

[0007] Optionally, the laser beam combining module further comprises a buckle portion, which is disposed in the accommodating cavity, and the wavelength division multiplexing body can be installed in the accommodating cavity through the buckle portion.

[0008] Optionally, the snap-on portion includes a first snap-on structure and a second snap-on structure, both of which are disposed in the accommodating cavity, a snap-on groove is formed between the first snap-on structure and the second snap-on structure, and the wavelength division multiplexing body is detachably installed in the snap-on groove.

[0009] Optionally, a first limiting protrusion is provided on a side of the first snap-fit ​​structure close to the second snap-fit ​​structure, and a second limiting protrusion is provided on a side of the second snap-fit ​​structure close to the first snap-fit ​​structure; the snap-fit ​​portion has a limiting state for limiting the wavelength division multiplexing body in the snap-fit ​​groove by the first limiting protrusion and the second limiting protrusion, and an avoidance state for allowing the first limiting protrusion and / or the second limiting protrusion to avoid the wavelength division multiplexing body.

[0010] Optionally, the first limiting protrusion and the second limiting protrusion are respectively arranged at the end of the first snap-fit ​​structure and the second snap-fit ​​structure away from the shell; the snap-fit ​​part also includes a supporting protrusion, which is arranged at the bottom of the snap-fit ​​groove and is used to support the side of the wavelength division multiplexing body close to the bottom of the snap-fit ​​groove, and a avoidance gap is arranged between the first snap-fit ​​structure and / or the second snap-fit ​​structure and the supporting protrusion.

[0011] Optionally, the laser beam combining module further comprises an optical fiber limiting portion, which is disposed in the accommodating cavity, and the first input optical fiber, the second input optical fiber and the output optical fiber can be limited by the optical fiber limiting portion.

[0012] Optionally, the optical fiber limiting portion includes a first limiting structure, which is arranged in the accommodating cavity, and a first limiting groove is formed between the first limiting structure and the inner wall of the accommodating cavity, and at least one of the first input optical fiber, the second input optical fiber and the output optical fiber can be limited by the first limiting groove.

[0013] Optionally, the optical fiber limiting portion also includes a second limiting structure, which is arranged in the accommodating cavity and has a second limiting groove formed thereon. At least one of the first input optical fiber, the second input optical fiber and the output optical fiber can be limited by the second limiting groove.

[0014] Optionally, the wavelength division multiplexing part includes three wavelength division multiplexing components, which are respectively a first wavelength division multiplexing component, a second wavelength division multiplexing component and a third wavelength division multiplexing component; the first wavelength division multiplexing component is provided with a first laser input end, a second laser input end and a first combined laser output end, the second wavelength division multiplexing component is provided with a third laser input end, a fourth laser input end and a second combined laser output end, and the third wavelength division multiplexing component is provided with a fifth laser input end, a sixth laser input end and a third combined laser output end; the first combined laser output end is connected with the third laser input end, the second combined laser output end is connected with the fifth laser input end, and the first laser input end, the second laser input end, the fourth laser input end and the sixth laser input end are respectively connected with four external laser input devices.

[0015] The beneficial effect of the laser beam combining module provided by the present application is that: compared with the prior art, the laser beam combining module provided by the present application arranges multiple wavelength division multiplexing components in a receiving cavity in sequence, and connects the beam combining laser output end of the previous wavelength division multiplexing component with one of the two laser input ends of the next wavelength division multiplexing component, and the laser input ends on the multiple wavelength division multiplexing components that are not connected with the beam combining laser output end are connected with an external laser input device, so that the laser beam combined by the previous wavelength division multiplexing component can enter the next wavelength division multiplexing component and be combined with another laser. Compared with the multi-wavelength laser beam combining module in the prior art, the laser beam combining module provided by the present application does not need to use a filter device when combining laser beams, and has low power attenuation. Moreover, when combining four or more laser beams of different wavelengths, the laser beam combining module of the present application can reduce the insertion loss of each laser beam when combining by first combining two lasers with similar wavelengths located at the ends, then combining the laser with a wavelength located at the other end, and finally combining the laser with a wavelength located in the middle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the optical path of a laser beam combining module provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the structure of a laser beam combining module provided in an embodiment of the present application;

[0019] Figure 3 A top view of a laser beam combining module provided in an embodiment of the present application;

[0020] Figure 4 A cross-sectional schematic diagram of a laser beam combining module is provided for an embodiment of the present application;

[0021] Figure 5 for Figure 4 A partial enlarged schematic diagram of the middle A area;

[0022] Figure 6 A scanning curve diagram of insertion loss (IL) of two optical signal channels of the first wavelength division multiplexing component provided in an embodiment of the present application;

[0023] Figure 7 A scanning curve diagram of insertion loss (IL) of three optical signal channels of the second wavelength division multiplexing component provided in an embodiment of the present application;

[0024] Figure 8 A scanning curve diagram of insertion loss (IL) of four optical signal channels of the third wavelength division multiplexing component provided in an embodiment of the present application;

[0025] The reference numerals in the above drawings are as follows:

[0026] 10. housing; 11. accommodating chamber;

[0027] 21. WDM component; 211. WDM main body; 212. first input optical fiber; 213. second input optical fiber; 214. output optical fiber;

[0028] 30. buckle portion; 31. first buckle structure; 32. second buckle structure; 33. snap-fit ​​groove; 34. support protrusion; 35. avoidance gap;

[0029] 40. Optical fiber limiting portion; 41. First limiting structure; 42. Second limiting structure. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application 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 operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] As described in the background technology, the red, green, and blue (RGB) multi-wavelength laser beam combining module is a device that combines multiple laser signals into a single-mode optical fiber for output. The red, green, and blue (RGB) multi-wavelength laser beam combining module is widely used in laser display, material processing, medical treatment, scientific research experiments, laser lighting, military, 3D printing, optical measurement and other fields, among which it is used in projection display equipment to achieve high-brightness and high-color saturation image display. The existing red, green, and blue (RGB) multi-wavelength laser beam combining modules mostly use filter devices to achieve beam combining. However, the red, green, and blue (RGB) multi-wavelength laser beam combining module using filter devices has a very large power attenuation of the optical signal after beam combining, and loses more than 50% of the optical power.

[0035] See also Figures 1 to 8As shown, in order to solve the above problems, according to one aspect of the present application, an embodiment of the present application provides a laser beam combining module, which includes: a shell 10 and a wavelength division multiplexing part, wherein a housing cavity 11 is arranged in the shell 10; the wavelength division multiplexing part includes a plurality of wavelength division multiplexing components 21, and the wavelength division multiplexing component 21 has two laser input ends and a beam combining laser output end. The plurality of wavelength division multiplexing components 21 are sequentially arranged in the housing cavity 11, and the beam combining laser output end of the previous wavelength division multiplexing component 21 is connected to one of the two laser input ends of the next wavelength division multiplexing component 21, and the laser input end not connected to the beam combining laser output end is connected to an external laser input device. The laser beam combining module provided in the present embodiment sequentially arranges a plurality of wavelength division multiplexing components 21 in the accommodating cavity 11, and connects the beam combining laser output end of the previous wavelength division multiplexing component 21 with one of the two laser input ends of the next wavelength division multiplexing component 21, and the laser input ends on the plurality of wavelength division multiplexing components 21 that are not connected with the beam combining laser output end are connected with an external laser input device, so that the laser beam combined by the previous wavelength division multiplexing component 21 can enter the next wavelength division multiplexing component 21 and be combined with another laser. Compared with the multi-wavelength laser beam combining module in the prior art, the laser beam combining module provided in the present embodiment does not need to use a filter device when combining laser beams, and has low power attenuation. Moreover, when combining four or more laser beams of different wavelengths, the laser beam combining module provided in the present embodiment can reduce the insertion loss of each laser beam when combining by first combining two lasers with similar wavelengths at the ends, then combining the laser with a wavelength at the other end, and finally combining the laser with a wavelength at the middle.

[0036] See also Figures 1 to 5 As shown, in a specific embodiment, the wavelength division multiplexing component 21 in this embodiment includes a wavelength division multiplexing body 211, a first input optical fiber 212, a second input optical fiber 213 and an output optical fiber 214. The first input optical fiber 212, the second input optical fiber 213 and the output optical fiber 214 are all arranged on the wavelength division multiplexing body 211 and are respectively connected to the wavelength division multiplexing body 211; the first input optical fiber 212 and the second input optical fiber 213 respectively form two laser input ends, and the output optical fiber 214 forms a combined laser output end. By arranging the first input optical fiber 212, the second input optical fiber 213 and the output optical fiber 214 on the wavelength division multiplexing body 211 provided in this embodiment, and making the first input optical fiber 212, the second input optical fiber 213 and the output optical fiber 214 all connected to the wavelength division multiplexing body 211, the wavelength division multiplexing component 21 can input the laser into the wavelength division multiplexing body 211 through the first input optical fiber 212 and the second input optical fiber 213 for beam combining, and output the combined laser through the output optical fiber 214.

[0037] See also Figures 2 to 5As shown, in a specific embodiment, the laser beam combining module in this embodiment further includes a buckle portion 30, which is disposed in the accommodating cavity 11, and the wavelength division multiplexing body 211 can be installed in the accommodating cavity 11 through the buckle portion 30. By arranging the buckle portion 30 in the accommodating cavity 11, the wavelength division multiplexing body 211 provided in this embodiment can be quickly installed in the accommodating cavity 11 by cooperating with the buckle portion 30. Compared with the method of fixing using RTV silicone or other types of glue in the prior art, the wavelength division multiplexing body 211 provided in this embodiment is more convenient to disassemble and assemble.

[0038] In an optional embodiment, there are multiple snap-on parts 30 provided in this embodiment, and the multiple snap-on parts 30 are arranged at intervals in the accommodating cavity 11, and the multiple wavelength division multiplexing bodies 211 correspond one-to-one to the multiple snap-on parts 30. By setting the snap-on parts 30 provided in this embodiment to be multiple, and arranging the multiple snap-on parts 30 at intervals in the accommodating cavity 11, the multiple wavelength division multiplexing bodies 211 provided in this embodiment can be installed in the accommodating cavity 11 by being installed on the multiple snap-on parts 30 in a one-to-one manner.

[0039] See also Figure 4 and Figure 5 As shown, in a specific embodiment, the buckle portion 30 in this embodiment includes a first buckle structure 31 and a second buckle structure 32, the first buckle structure 31 and the second buckle structure 32 are both arranged in the accommodating cavity 11, a buckle groove 33 is formed between the first buckle structure 31 and the second buckle structure 32, and the wavelength division multiplexing body 211 is detachably installed in the buckle groove 33. By arranging the first buckle structure 31 and the second buckle structure 32 provided in this embodiment in the accommodating cavity 11, and forming the buckle groove 33 between the first buckle structure 31 and the second buckle structure 32, the buckle portion 30 provided in this embodiment can be installed on the wavelength division multiplexing body 211 through the buckle groove 33.

[0040] See also Figure 5As shown, in a specific embodiment, a first limiting protrusion is provided on a side of the first snap-fit ​​structure 31 in this embodiment close to the second snap-fit ​​structure 32, and a second limiting protrusion is provided on a side of the second snap-fit ​​structure 32 close to the first snap-fit ​​structure 31; the snap-fit ​​portion 30 has a limiting state for limiting the wavelength division multiplexing body 211 in the snap-fit ​​groove 33 by the first limiting protrusion and the second limiting protrusion, and an avoidance state for enabling the first limiting protrusion and / or the second limiting protrusion to avoid the wavelength division multiplexing body 211. By setting a first limiting protrusion on a side of the first snap-in structure 31 provided in the present embodiment close to the second snap-in structure 32, and setting a second limiting protrusion on a side of the second snap-in structure 32 close to the first snap-in structure 31, the laser beam combining module can limit the wavelength division multiplexing body 211 in the snap-in slot 33 by setting the snap-in portion 30 to a limiting state. At the same time, when the wavelength division multiplexing body 211 needs to be removed from the snap-in slot 33, the laser beam combining module provided in the present embodiment can set the snap-in portion 30 to an avoidance state so that the first limiting protrusion and / or the second limiting protrusion avoid the wavelength division multiplexing body 211 in the snap-in slot 33, thereby allowing the wavelength division multiplexing body 211 provided in the present embodiment to be easily removed from the snap-in slot 33.

[0041] In a specific embodiment, the first snap-fit ​​structure 31 and / or the second snap-fit ​​structure provided in this embodiment can elastically deform toward a side away from the snap-fit ​​groove 33, so that the first limiting protrusion and / or the second limiting protrusion avoid the wavelength division multiplexing body 211 in the snap-fit ​​groove 33, thereby switching the snap-fit ​​portion 30 from a limiting state to an avoidance state.

[0042] See also Figure 5As shown, in a specific embodiment, the first limiting protrusion and the second limiting protrusion in this embodiment are respectively arranged at the end of the first snap structure 31 and the second snap structure 32 away from the shell 10; the snap portion 30 also includes a supporting protrusion 34, and the supporting protrusion 34 is arranged at the bottom of the snap groove 33, for supporting the side of the wavelength division multiplexing body 211 close to the bottom of the snap groove 33, and a avoidance gap 35 is arranged between the first snap structure 31 and / or the second snap structure 32 and the supporting protrusion 34. By respectively arranging the first limiting protrusion and the second limiting protrusion provided in the present embodiment at the end of the first snap structure 31 and the second snap structure 32 away from the shell 10, and arranging a support protrusion 34 at the bottom of the snap groove 33 that can support the side of the wavelength division multiplexing body 211 close to the bottom of the snap groove 33, the snap portion 30 provided in the present embodiment can limit the wavelength division multiplexing body 211 through the side of the snap groove 33 away from the shell 10. At the same time, by arranging an avoidance gap 35 between the first snap structure 31 and / or the second snap structure 32 and the support protrusion 34, the first snap structure 31 and / or the second snap structure 32 can be separated from the support protrusion 34 through the avoidance gap 35, so that the first snap structure 31 and / or the second snap structure provided in the present embodiment can avoid the wavelength division multiplexing body 211 in the snap groove 33 by elastically deforming toward the side away from the support protrusion 34.

[0043] In an optional embodiment, a clearance gap 35 is provided between the first buckle structure 31 and the supporting protrusion 34 and between the second buckle structure 32 and the supporting protrusion 34 provided in this embodiment.

[0044] In a specific embodiment, since the snap-fitting portion provided in this embodiment limits the wavelength division multiplexing main body 211 through the side of the snap-fitting groove 33 away from the shell 10, the height of the first snap-fitting structure 31 and the second snap-fitting structure 32 provided in this embodiment can be designed to be higher. Increasing the height of the first snap-fitting structure 31 and the second snap-fitting structure 32 can reduce the structural stiffness of the first snap-fitting structure 31 and the second snap-fitting structure 32, so that the first snap-fitting structure 31 and the second snap-fitting structure 32 can be elastically deformed more easily.

[0045] In an optional embodiment, the height of the support protrusion 34 provided in this embodiment is 2.6 mm.

[0046] In an optional embodiment, the height of the first buckle structure 31 and the second buckle structure 32 provided in this embodiment is 6 mm.

[0047] In an optional embodiment, the shell 10 provided in this embodiment has a length of 124 mm, a width of 107 mm, and a height of 10 mm.

[0048] See also Figure 2 and Figure 3 As shown, in a specific embodiment, the laser beam combining module in this embodiment further includes a fiber limiting portion 40, which is disposed in the accommodating cavity 11, and the first input optical fiber 212, the second input optical fiber 213, and the output optical fiber 214 can be limited by the fiber limiting portion 40. By disposing the fiber limiting portion 40 in the accommodating cavity 11 provided in this embodiment, the laser beam combining module provided in this embodiment can limit the first input optical fiber 212, the second input optical fiber 213, and the output optical fiber 214 by the fiber limiting portion 40.

[0049] See also Figure 2 and Figure 3 As shown, in a specific embodiment, the optical fiber limiting portion 40 in this embodiment includes a first limiting structure 41, the first limiting structure 41 is arranged in the accommodating cavity 11, a first limiting groove is formed between the first limiting structure 41 and the inner side wall of the accommodating cavity 11, and at least one of the first input optical fiber 212, the second input optical fiber 213 and the output optical fiber 214 can be limited by the first limiting groove. By arranging the first limiting structure 41 in the accommodating cavity 11 provided in this embodiment, and forming the first limiting groove between the first limiting structure 41 and the inner side wall of the accommodating cavity 11, the laser beam combining module provided in this embodiment can limit at least one of the first input optical fiber 212, the second input optical fiber 213 and the combined laser output optical fiber 214 through the first limiting groove.

[0050] In an optional embodiment, the first limiting structure 41 provided in this embodiment includes a first limiting plate, which is arranged at the bottom of the accommodating cavity 11, and a first limiting groove is formed between the first limiting plate and the inner wall of the accommodating cavity 11.

[0051] In an optional embodiment, the first limiting plates provided in this embodiment are multiple, and the multiple first limiting plates are arranged at intervals along the circumference of the accommodating cavity 11.

[0052] In an optional embodiment, a first limiting protrusion is provided on one side of the first limiting plate provided in this embodiment close to the first limiting groove, and the laser beam combining module can limit the first input optical fiber 212, the second input optical fiber 213 and the combined laser output optical fiber 214 located in the first limiting groove through the first limiting protrusion.

[0053] In an optional embodiment, the first limiting protrusion provided in this embodiment is located on an end of the first limiting plate away from the bottom of the accommodating cavity 11 .

[0054] In an optional embodiment, the first limiting protrusions provided in this embodiment are multiple, and the multiple first limiting protrusions are arranged at intervals along the extension direction of the first limiting groove.

[0055] In an optional embodiment, a second limiting protrusion is provided on the inner wall of the accommodating cavity 11 provided in this embodiment, and the position of the second limiting protrusion corresponds to the position of the first limiting plate. The laser beam combining module can limit the first input optical fiber 212, the second input optical fiber 213 and the combined laser output optical fiber 214 located in the first limiting groove through the second limiting protrusion.

[0056] In an optional embodiment, the second limiting protrusions provided in this embodiment are multiple, and the multiple second limiting protrusions are arranged at intervals along the extension direction of the first limiting groove.

[0057] In an optional embodiment, a first clearance gap is formed between the first limiting protrusion provided in this embodiment and the inner wall of the accommodating cavity 11, and a second clearance gap is formed between the second limiting protrusion and the first limiting plate. The first input optical fiber 212, the second input optical fiber 213 and the combined laser output optical fiber 214 provided in this embodiment can pass through the first clearance gap and the second clearance gap and be installed in the first limiting groove.

[0058] See also Figure 2 and Figure 3 As shown, in a specific embodiment, the optical fiber limiting portion 40 in this embodiment further includes a second limiting structure 42, which is disposed in the accommodating cavity 11, and a second limiting groove is formed on the second limiting structure 42, and at least one of the first input optical fiber 212, the second input optical fiber 213, and the output optical fiber 214 can be limited by the second limiting groove. By arranging the second limiting structure 42 in the accommodating cavity 11 provided in this embodiment, and forming the second limiting groove on the second limiting structure 42, the laser beam combining module provided in this embodiment can limit at least one of the first input optical fiber 212, the second input optical fiber 213, and the combined laser output optical fiber 214 through the second limiting groove.

[0059] In an optional embodiment, the second limiting structure 42 provided in this embodiment includes a second limiting plate and a third limiting plate. The second limiting plate and the third limiting plate provided in this embodiment are both arranged at the bottom of the accommodating cavity 11, and a second limiting groove is formed between the second limiting plate and the third limiting plate.

[0060] In an optional embodiment, a third limiting protrusion is provided on the side of the second limiting plate close to the third limiting plate provided in this embodiment, and a fourth limiting protrusion is provided on the side of the third limiting plate close to the second limiting plate. The laser beam combining module provided in this embodiment can limit the first input optical fiber 212, the second input optical fiber 213 and the combined laser output optical fiber 214 located in the second limiting groove through the third limiting protrusion and the fourth limiting protrusion.

[0061] In an optional embodiment, the third limiting protrusions provided in this embodiment are multiple, and the multiple third limiting protrusions are arranged at intervals along the extension direction of the second limiting groove.

[0062] In an optional embodiment, the fourth limiting protrusions provided in this embodiment are multiple, and the multiple fourth limiting protrusions are arranged at intervals along the extension direction of the second limiting groove.

[0063] In an optional embodiment, a third clearance gap is formed between the third limiting protrusion and the third limiting plate provided in this embodiment, and a fourth clearance gap is formed between the fourth limiting protrusion and the second limiting plate. The first input optical fiber 212, the second input optical fiber 213 and the combined laser output optical fiber 214 provided in this embodiment can pass through the third clearance gap and the fourth clearance gap and be installed in the second limiting groove.

[0064] In an optional embodiment, the housing 10 , the buckle portion 30 and the optical fiber limiting portion 40 provided in this embodiment are all made of nylon.

[0065] In an optional embodiment, the housing 10, the buckle portion 30 and the optical fiber limiting portion 40 provided in this embodiment are integrally formed by 3D printing.

[0066] See also Figures 1 to 5 As shown, in a specific embodiment, the wavelength division multiplexing part in this embodiment includes three wavelength division multiplexing components 21, and the three wavelength division multiplexing components 21 are respectively a first wavelength division multiplexing component, a second wavelength division multiplexing component and a third wavelength division multiplexing component. The first wavelength division multiplexing component is provided with a first laser input end, a second laser input end and a first beam combining laser output end, the second wavelength division multiplexing component is provided with a third laser input end, a fourth laser input end and a second beam combining laser output end, and the third wavelength division multiplexing component is provided with a fifth laser input end, a sixth laser input end and a third beam combining laser output end; the first beam combining laser output end is connected with the third laser input end, the second beam combining laser output end is connected with the fifth laser input end, and the first laser input end, the second laser input end, the fourth laser input end and the sixth laser input end are respectively connected with four external laser input devices.

[0067] In a specific embodiment, the first wavelength division multiplexing component provided in this embodiment includes a first wavelength division multiplexing body, a first signal input optical fiber, a second signal input optical fiber and a first combined signal output optical fiber, the second wavelength division multiplexing component includes a second wavelength division multiplexing body, a third signal input optical fiber, a fourth signal input optical fiber and a second combined signal output optical fiber, and the third wavelength division multiplexing component includes a third wavelength division multiplexing body, a fifth signal input optical fiber, a sixth signal input optical fiber and a third combined signal output optical fiber.

[0068] In an optional embodiment, the first signal input fiber provided in this embodiment forms a first laser input end, the second signal input fiber forms a second laser input end, and the first combined signal output fiber forms a first combined laser output end.

[0069] In an optional embodiment, the third signal input fiber provided in this embodiment forms a third laser input end, the fourth signal input fiber forms a fourth laser input end, and the second combined signal output fiber forms a second combined laser output end.

[0070] In an optional embodiment, the fifth signal input fiber provided in this embodiment forms a fifth laser input end, the sixth signal input fiber forms a sixth laser input end, and the third combined signal output fiber forms a third combined laser output end.

[0071] In a specific embodiment, the first combined signal output fiber provided in this embodiment is connected to the third signal input fiber, the second combined signal output fiber is connected to the fifth signal input fiber, and the first signal input fiber, the second signal input fiber, the fourth signal input fiber and the sixth signal input fiber are respectively connected to four external laser input devices.

[0072] In an optional embodiment, the first signal input optical fiber provided in this embodiment is used as a 480nm optical signal channel, and the optical signal with a wavelength of 488nm can be input into the first wavelength division multiplexing body through the 480nm optical signal channel provided in this embodiment, the second signal input optical fiber is used as a 520nm optical signal channel, and the optical signal with a wavelength of 520nm can be input into the first wavelength division multiplexing body through the 520nm optical signal channel provided in this embodiment, and the first combined signal output optical fiber is used as a 500nm optical signal channel. The optical signals with wavelengths of 488nm and 520nm after being combined by the first wavelength division multiplexing body can be output through the 500nm optical signal channel. The insertion loss (IL) scanning curves of the two optical signal channels of the first wavelength division multiplexing component are as shown in FIG. Figure 6 As shown, Figure 6 Curve 1 in the figure is the insertion loss (IL) scanning curve of the 520nm optical signal channel. Figure 6 Curve 2 in FIG. 1 is a scanning curve of the insertion loss (IL) of a 488 nm optical signal channel.

[0073] In an optional embodiment, the third signal input optical fiber provided in this embodiment is used as a 500nm optical signal channel, and the optical signals with wavelengths of 488nm and 520nm after beam combining can be input into the second wavelength division multiplexing body through the 500nm optical signal channel provided in this embodiment, the fourth signal input optical fiber is used as a 780nm optical signal channel, and the optical signal with a wavelength of 785nm can be input into the second wavelength division multiplexing body through the 780nm optical signal channel provided in this embodiment, the second beam combined signal output optical fiber is used as a 780nm and 500nm optical signal channel, and the optical signals with wavelengths of 488nm, 520nm and 780nm after beam combining by the second wavelength division multiplexing body can be output through the 780nm and 500nm optical signal channels, and the insertion loss (IL) scanning curves of the three optical signal channels of the second wavelength division multiplexing component are as shown in FIG. Figure 7 As shown, Figure 7 Curve 1 in the figure is the insertion loss (IL) scanning curve of the 785nm optical signal channel. Figure 7 Curve 2 in FIG. 1 is the insertion loss (IL) scanning curve of the 488nm and 520nm optical signal channels.

[0074] In an optional embodiment, the fifth signal input optical fiber provided in this embodiment is used as a 780nm and 500nm optical signal channel, and the optical signals with wavelengths of 488nm, 520nm and 780nm after beam combining can be input into the third wavelength division multiplexing main body through the 780nm and 500nm optical signal channels provided in this embodiment, the sixth signal input optical fiber is used as a 640nm optical signal channel, and the optical signal with a wavelength of 660nm can be input into the third wavelength division multiplexing main body through the 640nm optical signal channel provided in this embodiment, the third beam combined signal output optical fiber is used as a 500nm and 780nm optical signal channel, that is, as a 488nm, 520nm and 785nm optical signal channel, and the optical signals with wavelengths of 488nm, 520nm, 780nm and 660nm after beam combining by the third wavelength division multiplexing main body can be output through 88nm, 520nm and 785nm optical signal channels, and the insertion loss (IL) scanning curves of the four optical signal channels of the third wavelength division multiplexing component are as shown in FIG. Figure 8 As shown, Figure 8 Curve 1 in the figure is the insertion loss (IL) scanning curve of the 660nm optical signal channel. Figure 8 Curve 2 in FIG. 1 is the insertion loss (IL) scanning curve of the 488nm, 520nm and 785nm optical signal channels.

[0075] In a specific embodiment, the first combined signal output fiber provided in this embodiment is connected to the third signal input fiber by fusion splicing, and the second combined signal output fiber is connected to the fifth signal input fiber by fusion splicing.

[0076] In an optional embodiment, the fusion point between the first combined signal output optical fiber and the third signal input optical fiber provided in this embodiment is protected by a fiber coating process, and the fusion point between the second combined signal output optical fiber and the fifth signal input optical fiber is protected by a fiber coating process. By using the fiber coating process to protect the fusion point between the first combined signal output optical fiber and the third signal input optical fiber and the fusion point between the second combined signal output optical fiber and the fifth signal input optical fiber, there is no need to fuse a heat shrink tube at the fusion point, which saves the space occupied by the heat shrink tube and also avoids the fiber bending loss caused by fusing the heat shrink tube.

[0077] In an optional embodiment, the wavelength division multiplexing component provided in this embodiment is a fused taper wavelength division multiplexer.

[0078] In an optional embodiment, the wavelength division multiplexing component provided in this embodiment is formed using short wavelength single mode optical fiber.

[0079] In an optional embodiment, the short-wavelength single-mode optical fiber provided in this embodiment is preferably Nufern-460-HP optical fiber.

[0080] In a specific embodiment, the insertion loss (IL) of each channel of the three wavelength division multiplexing components provided in this embodiment can be achieved below 0.5dB. Therefore, the maximum insertion loss (IL) of the laser beam combining module provided in this embodiment is less than 1.5dB, the optical power loss is less than 30%, and the spot ellipticity of each optical signal output is greater than 90%.

[0081] In a specific embodiment, insertion loss tests are performed on 10 laser beam combining modules with three wavelength division multiplexing components provided in this embodiment, and the obtained insertion loss (IL) measured data is shown in Table 1.

[0082] Table 1

[0083]

[0084] In summary, the implementation of the laser beam combining module provided in this embodiment has at least the following beneficial technical effects: the laser beam combining module provided in this embodiment arranges multiple wavelength division multiplexing components in the accommodating cavity in sequence, and connects the beam combining laser output end of the previous wavelength division multiplexing component with one of the two laser input ends of the next wavelength division multiplexing component, and the laser input ends on the multiple wavelength division multiplexing components that are not connected with the beam combining laser output end are connected with an external laser input device, so that the laser beam combined by the previous wavelength division multiplexing component can enter the next wavelength division multiplexing component and be combined with another laser. Compared with the multi-wavelength laser beam combining module in the prior art, the laser beam combining module provided in this embodiment does not need to use a filter device when combining laser beams, and has low power attenuation. Moreover, when combining four or more laser beams of different wavelengths, the laser beam combining module provided in this embodiment can reduce the insertion loss of each laser beam when combining by first combining two lasers with similar wavelengths located at the ends, then combining the laser with a wavelength located at the other end, and finally combining the laser with a wavelength located in the middle.

[0085] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A laser beam combining module, characterized in that: The laser beam combining module comprises: A housing (10), wherein a receiving chamber (11) is provided in the housing (10); A wavelength division multiplexing section, the wavelength division multiplexing section comprising a plurality of wavelength division multiplexing components (21), the wavelength division multiplexing components (21) having two laser input ends and a beam combining laser output end, the plurality of wavelength division multiplexing components (21) being sequentially arranged in the accommodating cavity (11), the beam combining laser output end of the preceding wavelength division multiplexing component (21) being connected to one of the two laser input ends of the succeeding wavelength division multiplexing component (21), and the laser input end not being connected to the beam combining laser output end being connected to an external laser input device.

2. The laser beam combining module according to claim 1, characterized in that: The wavelength division multiplexing component (21) comprises a wavelength division multiplexing body (211), a first input optical fiber (212), a second input optical fiber (213) and an output optical fiber (214); the first input optical fiber (212), the second input optical fiber (213) and the output optical fiber (214) are all arranged on the wavelength division multiplexing body (211) and are respectively connected to the wavelength division multiplexing body (211); The first input optical fiber (212) and the second input optical fiber (213) respectively form the two laser input ends, and the output optical fiber (214) forms the combined laser output end.

3. The laser beam combining module according to claim 2, characterized in that: The laser beam combining module further comprises a buckle portion (30), wherein the buckle portion (30) is arranged in the accommodating cavity (11), and the wavelength division multiplexing body (211) can be installed in the accommodating cavity (11) through the buckle portion (30).

4. The laser beam combining module according to claim 3, characterized in that: The snap-on portion (30) comprises a first snap-on structure (31) and a second snap-on structure (32); the first snap-on structure (31) and the second snap-on structure (32) are both arranged in the accommodating cavity (11); a snap-on groove (33) is formed between the first snap-on structure (31) and the second snap-on structure (32); and the wavelength division multiplexing body (211) is detachably installed in the snap-on groove (33).

5. The laser beam combining module according to claim 4, characterized in that: A first position-limiting protrusion is provided on a side of the first buckle structure (31) close to the second buckle structure (32), and a second position-limiting protrusion is provided on a side of the second buckle structure (32) close to the first buckle structure (31); The buckle portion (30) has a limiting state in which the wavelength division multiplexing body (211) in the snap-fit ​​groove (33) is limited by the first limiting protrusion and the second limiting protrusion, and an evading state in which the first limiting protrusion and / or the second limiting protrusion can evade the wavelength division multiplexing body (211).

6. The laser beam combining module according to claim 5, characterized in that: The first limiting convex portion and the second limiting convex portion are respectively arranged at an end of the first buckle structure (31) and the second buckle structure (32) away from the housing (10); The snap-fit ​​portion (30) further comprises a supporting protrusion (34), wherein the supporting protrusion (34) is arranged at the bottom of the snap-fit ​​groove (33) and is used to support a side of the wavelength division multiplexing body (211) close to the bottom of the snap-fit ​​groove (33), and a clearance gap (35) is arranged between the first snap-fit ​​structure (31) and / or the second snap-fit ​​structure (32) and the supporting protrusion (34).

7. The laser beam combining module according to claim 2, characterized in that: The laser beam combining module further comprises an optical fiber limiting portion (40), wherein the optical fiber limiting portion (40) is arranged in the accommodating cavity (11), and the first input optical fiber (212), the second input optical fiber (213) and the output optical fiber (214) can be limited by the optical fiber limiting portion (40).

8. The laser beam combining module according to claim 7, characterized in that: The optical fiber limiting portion (40) comprises a first limiting structure (41), the first limiting structure (41) being arranged in the accommodating cavity (11), a first limiting groove being formed between the first limiting structure (41) and the inner side wall of the accommodating cavity (11), and at least one of the first input optical fiber (212), the second input optical fiber (213) and the output optical fiber (214) being capable of being limited in the first limiting groove.

9. The laser beam combining module according to claim 8, characterized in that: The optical fiber limiting portion (40) further comprises a second limiting structure (42), wherein the second limiting structure (42) is arranged in the accommodating cavity (11), and a second limiting groove is formed on the second limiting structure (42), and at least one of the first input optical fiber (212), the second input optical fiber (213) and the output optical fiber (214) can be limited by the second limiting groove.

10. The laser beam combining module according to any one of claims 1 to 9, characterized in that: The wavelength division multiplexing part comprises three wavelength division multiplexing components (21), the three wavelength division multiplexing components (21) are respectively a first wavelength division multiplexing component, a second wavelength division multiplexing component and a third wavelength division multiplexing component, the first wavelength division multiplexing component is provided with a first laser input end, a second laser input end and a first beam combining laser output end, the second wavelength division multiplexing component is provided with a third laser input end, a fourth laser input end and a second beam combining laser output end, and the third wavelength division multiplexing component is provided with a fifth laser input end, a sixth laser input end and a third beam combining laser output end; The first combined laser output end is connected to the third laser input end, the second combined laser output end is connected to the fifth laser input end, and the first laser input end, the second laser input end, the fourth laser input end and the sixth laser input end are connected to the four external laser input devices respectively.

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