Multimode fiber coupling packaging visible light laser

Abstract

The utility model relates to the technical field of photoelectronics, in particular to a multimode optical fiber coupling packaging visible light laser, which is characterized in that a TO tube seat assembled with a laser tube core, a low-temperature solder ring and a coaxial coupling jacket structural member are in interference pressing fit to form an assembly to be coupled, and low-temperature stepped reflow soldering is carried out to form a multi-mode optical fiber coupling packaging visible light laser. Inserting an optical fiber assembly comprising an optical fiber of which the front end face is a certain inclined angle or a wedge-shaped lens end face, a standard optical output interface connector, an optical fiber conical protective sleeve, a stainless steel tailstock and a ceramic ferrule into the front assembly to be coupled, and performing active coupling alignment through a high-precision coupling table under the condition that a laser is powered up; meanwhile, fine adjustment and locking are conducted through the fixing assembly, and then installation can be completed; in some low-cost application scenes, the technical problem that in the prior art, an optical fiber coupling packaging semiconductor visible light laser is obviously insufficient in the aspects of light beam quality, coupling efficiency, coupling packaging alignment and fixing is solved in the mode.

Description

A multimode fiber-coupled packaged visible laser Technical Field

[0001] This utility model relates to the field of optoelectronic technology, and in particular to a multimode fiber-coupled packaged visible light laser. Background Technology

[0002] Currently, fiber-coupled packaged semiconductor visible light lasers are widely used in fiber optic communication and fiber laser irradiation, but they face two major technical challenges in practical applications.

[0003] On the one hand, the asymmetric active waveguide structure in the emitting region of semiconductor lasers results in poor output beam quality, making it difficult to match the mode field with the optical fiber and leading to low coupling efficiency. To meet usage requirements, beam shaping is necessary; however, the optical path structures for beam shaping are diverse, requiring reasonable optical design and selection based on specific application scenarios.

[0004] On the other hand, in fiber-optic and semiconductor laser coupling packaging assemblies, achieving micron-level precision collimation and alignment between the fiber and the laser chip, as well as a permanent fixing structure, is a major challenge. Currently, high-precision micro-stages and laser welding machines are mainly used to achieve permanent coupling and fixing, but this method suffers from drawbacks such as complex coupling structures and high equipment costs.

[0005] In summary, existing fiber-coupled packaged semiconductor visible light lasers have significant shortcomings in terms of beam quality and coupling efficiency, as well as coupling package alignment and fixation. Summary of the Invention

[0006] The purpose of this invention is to provide a multimode fiber-coupled packaged visible light laser, which aims to solve the technical problems of existing fiber-coupled packaged semiconductor visible light lasers in terms of beam quality and coupling efficiency, as well as coupling package alignment and fixation.

[0007] To achieve the above objectives, this utility model employs a multimode fiber-coupled encapsulated visible light laser, comprising a coaxial coupling outer casing, a fixing assembly, a lens fiber fixing ceramic ferrule, a stainless steel tailstock, a fiber protective sleeve, an encapsulated laser body, and a fiber column lens. An output fiber is disposed within the lens fiber fixing ceramic ferrule, and the front end of the output fiber is a beveled or wedge-shaped lens. The stainless steel tailstock is connected to the lens fiber fixing ceramic ferrule. The fixing assembly is used to lock and position the lens fiber fixing ceramic ferrule. The fiber column lens is connected to the encapsulated laser body and also to the output fiber. The fiber protective sleeve is connected to the coaxial coupling outer casing.

[0008] The number of fixing components is multiple sets, and the multiple sets of fixing components are evenly distributed along the axial centerline of the coaxial coupling outer sleeve structure.

[0009] Each set of fixing components includes two set screws, and the coaxial coupling outer sleeve structure has multiple threaded holes. The set screws are threadedly engaged with the corresponding threaded holes and abut against the lens fiber fixing ceramic ferrule.

[0010] The coaxial coupling jacket structure has a stepped portion, the optical fiber protective sleeve is connected to the stepped portion, and the threaded hole is provided in the stepped portion.

[0011] The fiber optic protective sleeve includes a connecting section and a tapered section. The connecting section is connected to the stepped portion, and the tapered section is fixedly connected to the connecting section.

[0012] The main body of the packaged laser is a TO18 packaged laser, a TO38 packaged laser, or a TO09 packaged laser.

[0013] This invention discloses a multimode fiber-coupled packaged visible light laser. In practical use, the assembly to be coupled is formed by pressing together a TO socket (which can be fitted with a fiber cylindrical lens for fast-axis beam compression), a low-temperature solder ring, and a coaxial coupling jacket structure, all fitted with the laser chip. A low-temperature stepped reflow soldering process is then performed to achieve high sealing and heat dissipation at the joint. The fiber assembly, comprising an optical fiber with a front end face of a specific angle or wedge-shaped lens, a standard optical output interface connector, a fiber tapered protective sleeve, a stainless steel tailstock, and a ceramic ferrule, is then inserted into the assembly to be coupled. With the laser powered on, active coupling alignment is performed using a high-precision coupling stage to maximize the optical output power. Simultaneously, fine-tuning and locking are performed using fixing components to precisely align and permanently fix the relative position of the fiber assembly and the laser chip, thus completing the installation.

[0014] A wedge-shaped lens is used at the front end of the output optical fiber, which is then directly coupled to the encapsulated laser main body die to achieve efficient coupling with the optical fiber. This optical path structure is simple in structure, reduces the number of components, simplifies the collimation process, and improves product reliability.

[0015] By utilizing the length of the inner lead of the TO package socket in the specially designed packaged laser body as a positioning bracket for the fiber optic column lens, and using UV-curable adhesive to precisely position and fix the aligned fiber optic column lens, the design features simple structure, low manufacturing difficulty, and low cost.

[0016] In the permanent fixing of the output optical fiber and the coaxial coupling jacket structure, the lens fiber fixing ceramic ferrule containing the output optical fiber is locked and fixed by six miniature set screws evenly distributed on the circumference of the coaxial coupling jacket structure, so that the relative position of the optical fiber and the coaxial coupling jacket structure is precisely aligned and permanently fixed.

[0017] The TO socket of the encapsulated laser body is sealed to the coaxial coupling outer sleeve structure using a low-temperature solder ring for stepped-temperature reflow soldering. This not only achieves high sealing performance but also improves the heat dissipation of the component. The other two sealing points (the threaded hole on the coaxial coupling outer sleeve structure and the joint between the fiber optic ferrule and the coaxial coupling outer sleeve structure) can be sealed with adhesive or with low-temperature solder for local stepped-temperature welding, depending on the application requirements.

[0018] This approach solves the technical problems of existing fiber-coupled packaged semiconductor visible light lasers, which have significant shortcomings in beam quality, coupling efficiency, coupling package alignment, and fixation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is a schematic diagram of the structure of the multimode fiber-coupled packaged visible light laser of this utility model.

[0021] Figure 2 is an exploded view of the multimode fiber-coupled packaged visible light laser of this invention.

[0022] Figure 3 is a schematic diagram of the internal structure of the multimode fiber-coupled packaged visible light laser of this utility model.

[0023] Figure 4 is a schematic diagram of two coupling optical path structure designs of this utility model.

[0024] 1-Coaxial coupling jacket structure, 2-Lens fiber fixing ceramic ferrule, 3-Stainless steel tailstock, 4-TO packaged laser body, 5-Fiber column lens, 6-Output fiber, 7-Set screw, 8-Threaded hole, 9-Stepped section, 10-Connecting section, 11-Tap section. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0026] Please refer to Figures 1 to 4, where Figure 1 is a structural schematic diagram of the multimode fiber-coupled packaged visible light laser of this invention. Figure 2 is an exploded view of the multimode fiber-coupled packaged visible light laser of this invention. Figure 3 is a schematic diagram of the internal structure of the multimode fiber-coupled packaged visible light laser of this invention. Figure 4 is a schematic diagram of two coupling optical path structure designs of this invention.

[0027] This utility model provides a multimode fiber-coupled packaged visible light laser, including a coaxial coupling outer casing 1, a fixing component, a lens fiber fixing ceramic ferrule 2, a stainless steel tailstock 3, a fiber protective sleeve, a packaged laser body 4, and a fiber column lens 5. An output fiber 6 is disposed within the lens fiber fixing ceramic ferrule 2, and the front end of the output fiber 6 is a beveled or wedge-shaped lens. The stainless steel tailstock 3 is connected to the lens fiber fixing ceramic ferrule 2. The fixing component is used to lock and position the lens fiber fixing ceramic ferrule 2. The fiber column lens 5 is connected to the packaged laser body 4, and the fiber column lens 5 is coupled and aligned with the output fiber 6. The fiber protective sleeve is connected to the coaxial coupling outer casing 1.

[0028] The packaged laser body 4 is a TO18 packaged laser, a TO38 packaged laser, or a TO09 packaged laser.

[0029] In this specific embodiment, during actual use, the TO tube socket of the laser body 4 is fixed to the coaxial coupling outer sleeve structure 1 by interference fit and sealed with a low-temperature solder ring to form the coupling assembly. The lens fiber fixing ceramic ferrule 2, which houses the output fiber 6 and the stainless steel tailstock 3, is placed inside the coaxial coupling outer sleeve structure 1 and coupled and fixed using the fixing assembly. Then, the fiber protective sleeve is installed on the coaxial coupling outer sleeve structure 1 to complete the installation. Efficient coupling with the fiber is achieved by setting a beveled or wedge-shaped lens at the front end of the output fiber 6 and directly coupling it to the die of the encapsulated laser body 4. This design features a simple structure, reduces the number of components, simplifies the collimation process, and improves product reliability.

[0030] The number of fixing components is multiple sets, and the multiple sets of fixing components are evenly distributed along the axial centerline of the coupled glass-sealed thermistor 1.

[0031] Each set of fixing components includes two set screws 7. The coaxial coupling outer sleeve structure 1 has multiple threaded holes 8. The set screws 7 are threadedly engaged with the corresponding threaded holes 8 and abut against the lens fiber fixing ceramic ferrule 2.

[0032] In this specific embodiment, the lens fiber fixing ceramic ferrule 2 containing the output optical fiber 6 is locked and fixed by six miniature set screws 7 evenly distributed on the circumference of the coaxial coupling outer sleeve structure 1, so that the relative position of the optical fiber and the coaxial coupling outer sleeve structure 1 is precisely aligned and permanently fixed.

[0033] Secondly, the coaxial coupling jacket structure 1 has a stepped portion 9, the optical fiber protective sleeve is connected to the stepped portion 9, and the threaded hole 8 is provided in the stepped portion 9;

[0034] The fiber optic protective sleeve includes a connecting section 10 and a tapered section 11. The connecting section 10 is connected to the stepped portion 9, and the tapered section 11 is fixedly connected to the connecting section 10.

[0035] In this specific embodiment, by providing the stepped portion 9 and the connecting section 10, the sealing performance between the optical fiber protective sleeve and the optical fiber protective sleeve can be improved.

[0036] This invention provides two coupling optical path structure designs, as shown in Figure 4a and b:

[0037] In this method, a) an optical path structure is achieved by adding the fiber pillar lens 5, which compresses the vertical divergence angle of the laser, and the multimode output fiber 6 with its front end face treated as an inclined plane, to the laser core's output path, thereby realizing efficient coupling with the output fiber 6. This solution has the advantages of simple structure, low manufacturing difficulty, and low cost.

[0038] Solution b employs a method where a wedge-shaped lens fiber is fabricated on the front end of the output fiber 6 using a polishing process, and then directly coupled to the laser core to achieve efficient coupling with the fiber. Compared to solution a, this solution has a simpler structure, reduces the number of components, simplifies the collimation process, and improves product reliability.

[0039] In the application of this invention, a multimode fiber-coupled packaged visible light laser is formed by pressing the TO tube socket of the packaged laser body 4 to the coaxial coupling outer sleeve structure 1 with an interference fit and sealing it with a low-temperature solder ring. Then, the lens fiber fixing ceramic ferrule 2, which contains the output fiber 6 and the stainless steel tailstock 3, is placed inside the coaxial coupling outer sleeve structure 1 and fixed using the fixing assembly. Finally, the fiber protective sleeve is installed on the coaxial coupling outer sleeve structure 1 to complete the installation.

[0040] A beveled or wedge-shaped lens is configured at the front end of the output fiber 6, and then directly coupled to the die of the encapsulated laser body 4 to achieve efficient coupling with the fiber. This optical path structure is simple in structure, reduces the number of components, simplifies the collimation process, and improves product reliability.

[0041] By utilizing the length of the inner lead of the TO package socket in the specially designed packaged laser body 4 as the positioning bracket for the fiber optic column lens 5, and using UV-curable adhesive to precisely position and fix the aligned fiber optic column lens 5, the design features simple structure, low manufacturing difficulty, and low cost.

[0042] In the permanent fixing of the output optical fiber 6 and the coaxial coupling jacket structure 1, the lens fiber fixing ceramic ferrule 2 containing the output optical fiber 6 is locked and fixed by six miniature set screws 7 evenly distributed on the circumference of the coaxial coupling jacket structure 1, so that the relative position of the optical fiber and the coaxial coupling jacket structure 1 is precisely aligned and permanently fixed.

[0043] The TO socket of the encapsulated laser body 4 is sealed to the coaxial coupling outer sleeve structure 1 using a low-temperature solder ring for stepped-temperature reflow soldering. This not only achieves high sealing performance but also improves the heat dissipation of the component. The other two sealing points (the threaded hole 8 on the coaxial coupling outer sleeve structure 1 and the joint between the fiber optic ferrule and the coaxial coupling outer sleeve structure 1) can be sealed with adhesive or with low-temperature solder for local stepped-temperature welding, depending on the application requirements.

[0044] In some low-cost application scenarios, this approach solves the technical problems of existing fiber-coupled packaged semiconductor visible light lasers in terms of beam quality and coupling efficiency, as well as coupling package alignment and fixation.

[0045] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A multimode fiber-coupled packaged visible light laser, characterized in that, The device includes a coaxial coupling outer casing, a fixing assembly, a lens fiber fixing ceramic ferrule, a stainless steel tailstock, a fiber protective sleeve, a packaged laser body, and a fiber column lens. An output fiber is housed within the lens fiber fixing ceramic ferrule, with the front end of the output fiber being a beveled or wedge-shaped lens. The stainless steel tailstock is connected to the lens fiber fixing ceramic ferrule. The fixing assembly is used to lock and position the lens fiber fixing ceramic ferrule. The fiber column lens is connected to the packaged laser body and is coupled and aligned with the output fiber. The fiber protective sleeve is connected to the coaxial coupling outer casing.

2. The multimode fiber-coupled packaged visible light laser as described in claim 1, characterized in that, The number of fixing components is multiple sets, and the multiple sets of fixing components are evenly distributed along the axial centerline of the coaxial coupling outer sleeve structure.

3. The multimode fiber-coupled packaged visible light laser as described in claim 2, characterized in that, Each set of fixing components includes two set screws, and the coaxial coupling outer sleeve structure has multiple threaded holes. The set screws are threadedly engaged with the corresponding threaded holes and abut against the lens fiber fixing ceramic ferrule.

4. The multimode fiber-coupled packaged visible light laser as described in claim 3, characterized in that, The coaxial coupling jacket structure has a stepped portion, the optical fiber protective sleeve is connected to the stepped portion, and the threaded hole is provided in the stepped portion.

5. The multimode fiber-coupled packaged visible light laser as described in claim 4, characterized in that, The fiber optic protective sleeve includes a connecting section and a tapered section. The connecting section is connected to the stepped portion, and the tapered section is fixedly connected to the connecting section.

6. The multimode fiber-coupled packaged visible light laser as described in claim 5, characterized in that, The main body of the packaged laser is a TO18 packaged laser, a TO38 packaged laser, or a TO09 packaged laser.

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