CN217112807U

CN217112807U - Optical fiber collimator

Info

Publication number: CN217112807U
Application number: CN202122368567.2U
Authority: CN
Inventors: 徐杰; 方洋; 绪海波
Original assignee: O Net Communications Shenzhen Ltd
Current assignee: O Net Technologies Shenzhen Group Co Ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-08-02
Anticipated expiration: 2031-09-28

Abstract

The utility model discloses an optical fiber collimator, which comprises an optical fiber, a lens, a hollow sleeve and an optical fiber connecting assembly, wherein the lens is welded with the optical fiber through the optical fiber connecting assembly, and the optical fiber, the optical fiber connecting assembly and part of the lens are nested and bonded in the hollow sleeve; wherein, optic fibre coupling assembling includes two sections at least diameters difference and the connecting fiber of butt fusion each other, lens have the exit face and be the incident surface of planar structure, one of them section connecting fiber with the incident surface butt fusion, another section connecting fiber with the fiber fusion, the exit face is located the outside of hollow sleeve.

Description

Optical fiber collimator

Technical Field

The utility model relates to a laser technical field especially relates to an optical collimator.

Background

With the development of semiconductor materials, waveguide technology, high-stability heat dissipation, aging resistance and high-efficiency heat dissipation technology, the requirements of semiconductor laser industrial processing application and high-power optical fiber lasers particularly promote the rapid development of high-power and high-beam-quality lasers output by optical fibers.

The collimating output, the dual and the optical fiber conduction of the optical fiber collimator realize the combination of a plurality of pumping lights and high-power light transmission. The existing optical fiber collimator generally comprises a cylindrical lens and an optical fiber, wherein the lens is connected with the optical fiber in a fusion mode, but the diameter of the optical fiber is far smaller than that of the lens, so that the fusion difficulty of the optical fiber and the lens is extremely high.

SUMMERY OF THE UTILITY MODEL

The utility model provides an optical fiber collimator can be in the same place optic fibre and lens butt fusion through the different and mutual welded connecting optic fibre of two sections at least diameters, and the diameter of having overcome optic fibre is far less than the diameter of lens and causes the big problem of the butt fusion degree of difficulty, and not only simple structure, reliability are high, application scope are wide, but also can realize optical fiber collimator's miniaturization and integration.

The utility model provides an optical fiber collimator, which comprises an optical fiber, a lens, a hollow sleeve and an optical fiber connecting assembly, wherein the lens is welded with the optical fiber through the optical fiber connecting assembly, and the optical fiber, the optical fiber connecting assembly and part of the lens are nested and bonded in the hollow sleeve;

wherein, optic fibre coupling assembling includes two sections at least diameters difference and the connecting fiber of butt fusion each other, lens have the exit face and be the incident surface of planar structure, one of them section connecting fiber with the incident surface butt fusion, another section connecting fiber with the fiber fusion, the exit face is located the outside of hollow sleeve.

The utility model discloses an among the fiber collimator of embodiment, fiber connection subassembly's diameter is followed optic fibre arrives the incident surface subtracts progressively, adjacent two sections the diameter ratio of connecting optic fibre is 1.5 ~ 2.5.

The utility model discloses an among the fiber collimator of embodiment, fiber connection subassembly includes first connecting fiber, second connecting fiber and third connecting fiber, optic fibre through first connecting fiber with the fusion splice of second connecting fiber, second connecting fiber through third connecting fiber with the incident surface fusion splice.

In an embodiment of the present invention, the first connecting optical fiber, the second connecting optical fiber, and the third connecting optical fiber are coreless optical fibers.

The utility model discloses an among the fiber collimator of embodiment, hollow sleeve intussuseption is filled with high temperature resistant and high refracting index's first colloid.

The utility model discloses an among the fiber collimator of embodiment, hollow sleeve intussuseption is filled with the first colloid of high temperature resistant and low refracting index.

In an embodiment of the present invention, the hollow sleeve is a ground glass tube having a high refractive index.

In an embodiment of the present invention, the exit surface is a spherical structure, and an antireflection film is plated on the spherical structure.

In an embodiment of the present invention, the focal point of the lens is disposed on a side of the incident surface away from the exit surface.

In an embodiment of the present invention, a second glue is coated on a welding portion between the connection optical fiber and the incident surface and between the connection optical fiber and the optical fiber; and/or the connecting optical fiber is a coreless optical fiber made of quartz.

The technical scheme provided by the embodiment of the application can have the following beneficial effects: the application designs an optical fiber collimator, including optic fibre, lens, cavity sleeve pipe and optical fiber connection subassembly, optical fiber connection subassembly includes two sections at least diameters difference and the connecting optical fibre of butt fusion each other for optic fibre and lens can be in the same place through the different and mutual butt fusion of connecting optical fibre of butt fusion of two sections at least diameters, the diameter of having overcome optic fibre is far less than the diameter of lens and causes the problem that the butt fusion degree of difficulty is big, simple structure not only, the reliability is high, application scope is wide, but also can realize optical fiber collimator's miniaturization and integration.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a fiber collimator according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of the fiber collimator of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the fiber collimator of FIG. 1;

FIG. 4 is a partial block diagram of the fiber collimator of FIG. 1;

FIG. 5 is a partially exploded view of the fiber collimator of FIG. 1;

FIG. 6 is a schematic structural diagram of the first colloid of FIG. 1;

FIG. 7 is a schematic structural view of the hollow sleeve of FIG. 1;

FIG. 8 is a graph illustrating the variation in system coupling efficiency for different diameters of the connectorized optical fiber of FIG. 1;

fig. 9 is a schematic diagram of the variation in system coupling efficiency for different lengths of the connectorized optical fiber of fig. 1.

Description of reference numerals:

10. an optical fiber;

20. a lens; 21. an incident surface; 22. an exit surface;

30. an optical fiber connection assembly; 31. a first connecting optical fiber; 32. a second connecting optical fiber; 33. a third connecting optical fiber;

40. a hollow sleeve;

50. a first colloid.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments and features of the embodiments described below can be combined with each other without conflict.

As shown in fig. 1 to 7, an optical fiber 10 collimator provided by the present application includes an optical fiber 10, a lens 20, a hollow sleeve 40, and an optical fiber connection assembly 30, wherein the lens 20 is fusion-spliced with the optical fiber 10 through the optical fiber connection assembly 30, and the optical fiber 10, the optical fiber connection assembly 30, and a portion of the lens 20 are nestedly and adhesively spliced in the hollow sleeve 40, so that the hollow sleeve 40 can protect the fusion-spliced portion of the optical fiber 10, the lens 20, and the optical fiber connection assembly 30.

Specifically, the optical fiber connection assembly 30 includes at least two sections of connecting optical fibers 10 with different diameters and welded to each other, the lens 20 has an exit surface 22 and an incident surface 21 with a planar structure, one section of the connecting optical fibers 10 is welded to the incident surface 21, the other section of the connecting optical fibers 10 is welded to the optical fibers 10, and the exit surface 22 is located on the outer side of the hollow sleeve 40, so that the optical fibers 10 and the lens 20 can be welded according to the diameter difference between the two sections of the connecting optical fibers 10 with different diameters, the problem that the welding difficulty is large due to the fact that the diameter of the optical fibers 10 is far smaller than that of the lens 20 is solved, and the optical fiber connection assembly is simple in structure, high in reliability and wide in application range, and can also achieve miniaturization and integration of the optical fiber 10 collimator.

For example, if the diameter of the optical fiber 10 is less than 0.25mm and the lens 20 is 1.8mm, three sections of connecting optical fibers 10 with different diameters can be selected to be fusion-spliced, namely a first connecting optical fiber 31, a second connecting optical fiber 32 and a third connecting optical fiber 33, wherein the diameter of the first connecting optical fiber 31 is 0.25mm, the diameter of the second connecting optical fiber 32 is 0.50mm, the diameter of the third connecting optical fiber 33 is 1.00mm, one end of the optical fiber 10 is fusion-spliced with one end of the first connecting optical fiber 31, the other end of the first connecting optical fiber 31 is fusion-spliced with one end of the second connecting optical fiber 32, the other end of the second connecting optical fiber 32 is fusion-spliced with one end of the third connecting optical fiber 33, the other end of the third connecting optical fiber 33 is fusion-spliced with the lens 20, and then the fusion-spliced

optical fibers

10, 31, 32, 33 and the lens 20 are mounted in the hollow sleeve 40 by filling glue, the hollow sleeve 40 can protect the fusion-spliced portion of the optical fiber 10, the first connection optical fiber 31, the second connection optical fiber 32, the third connection optical fiber 33, and the lens 20.

In an alternative embodiment, the diameter of the optical fiber connecting component 30 decreases from the optical fiber 10 to the incident surface 21, wherein the diameter ratio of the connecting optical fibers 10 of two adjacent segments is 1.5-2.5, so that the diameter of the optical fiber connecting component 30 is prevented from being changed too much to affect the efficiency of the fusion system.

Specifically, as shown in fig. 8 and 9, each segment of the connecting optical fiber 10 has a length of 1mm, and the diameter ratio of the connecting optical fiber 10 of two adjacent segments is 2, so that the connecting optical fiber 10 can be prevented from affecting the efficiency of the fusion splicing system.

In an alternative embodiment, as shown in fig. 1 to 7, the optical fiber connection assembly 30 includes a first connection optical fiber 31, a second connection optical fiber 32 and a third connection optical fiber 33, wherein the optical fiber 10 is fusion-spliced with the second connection optical fiber 32 through the first connection optical fiber 31, and the second connection optical fiber 32 is fusion-spliced with the incident surface 21 through the third connection optical fiber 33, so that the diameter of the connection optical fiber 10 can be graded and segmented according to the diameter of the lens 20, and then the discharge time and power of the connection optical fiber 10 during the fusion-splicing process are controlled according to the gradient change of the connection optical fiber 10.

Illustratively, the optical fiber 10, the first connecting optical fiber 31, the second connecting optical fiber 32, the third connecting optical fiber 33 and the lens 20 are fusion-spliced section by using a fusion splicer, and fusion splicing corresponding to the core diameter ratio is completed by adjusting the fusion-splicing discharge time and the strength of the fusion splicer. After the optical fiber 10, the first connection optical fiber 31, the second connection optical fiber 32, the third connection optical fiber 33 and the lens 20 are welded, the optical fiber 10, the first connection optical fiber 31, the second connection optical fiber 32, the third connection optical fiber 33 and the lens 20 are arranged in the hollow sleeve 40, and then are filled with high-temperature-resistant glue, wherein the type of the high-temperature-resistant glue is selected according to the use range of the optical fiber 10 collimator.

In an alternative embodiment, the first connecting optical fiber 31, the second connecting optical fiber 32, and the third connecting optical fiber 33 are coreless optical fibers. The coreless optical fiber is an optical fiber with an extremely simple structure, does not have a fiber core inside, and is actually a homogeneous light guide fiber of a glass cylindrical waveguide.

In an alternative embodiment, the hollow sleeve 40 is filled with a first gel 50 that is resistant to high temperature and has a high refractive index, so that the optical fiber 10 collimator can be used as a high-power passive collimator. The hollow sleeve 40 is a ground glass tube with high refractive index, and can play a role in scattering stray light and avoiding the light effect of heat accumulation peeling off the cladding caused by laser concentration.

In an alternative embodiment, the hollow sleeve 40 is filled with a first colloid 50 with high temperature resistance and low refractive index, which reduces light leakage of the cladding, so that the optical fiber 10 collimator can be used as a high-power active collimator. The hollow sleeve 40 is a ground glass tube with a high refractive index, so that stray light of an adhesive layer in the first adhesive body 50 can be eliminated, and failure of the first adhesive body 50 caused by heat accumulation is avoided.

In an alternative embodiment, the exit surface 22 is a spherical structure coated with a high power-resistant antireflection film.

Since the incident surface 21 has a planar structure and the exit surface 22 has a spherical structure, the lens 20 can be a curved lens 20 or a graded index lens 20. Wherein the focal point of the lens 20 is set on the side of the incident surface 21 away from the exit surface 22, so that the working distance of the collimator of the optical fiber 10 can be controlled by adjusting the welding length of the coreless fiber, including but not limited to controlling the length of the coreless fiber welded to the segment of the lens 20; meanwhile, by controlling the length of the coreless fiber, the lens 20 suitable for different focal lengths and different types of optical fibers 10 are selected, including the core diameters and numerical apertures of the optical fibers 10 and the lens 20.

In an alternative embodiment, the fusion splice connecting the optical fiber 10 with the incident surface 21 and the optical fiber 10 is coated with a second glue, so that the collimator of the optical fiber 10 can be applied with a two-step method according to the type of filling glue. The active collimator adopts the first glue 50 as high-temperature-resistant and low-refractive-index glue, the glue is mostly anaerobic coating glue, and the low-refractive-index glue can be sealed by adopting a two-stage glue supplementing mode so as to avoid the contact of the first glue 50 and oxygen; on the other hand, the adhesive force of the first adhesive body 50 is generally not strong, and the second adhesive body is required to play a role in enhancing the adhesive force, so that the stability of the optical fiber 10 collimator is improved.

In an alternative embodiment, the connecting optical fiber 10 is a coreless optical fiber made of quartz, and the connecting optical fibers 10 of the same type are used for welding, so that the problem of uneven refractive index of a welding interface can be avoided.

In the present embodiment, the fusion of the fusion optical fiber 10, the first connection optical fiber 31, the second connection optical fiber 32, the third connection optical fiber 33, and the lens 20 can be performed by adjusting the fusion discharge time and intensity of the fusion splicer, and the degree of axial center of the fusion optical fiber 10, the first connection optical fiber 31, the second connection optical fiber 32, the third connection optical fiber 33, and the lens 20 can be determined by the machine vision software of the fusion splicer, thereby improving the accuracy of the axial center and reducing the error rate.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of the specific examples are described above. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description of the present specification, reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An optical fiber collimator is characterized by comprising an optical fiber, a lens, a hollow sleeve and an optical fiber connecting assembly, wherein the lens is welded with the optical fiber through the optical fiber connecting assembly, and the optical fiber, the optical fiber connecting assembly and part of the lens are nested and bonded in the hollow sleeve;

2. The optical fiber collimator as claimed in claim 1, wherein the diameter of the optical fiber connecting component decreases from the optical fiber to the incident surface, and the ratio of the diameters of two adjacent segments of the connecting optical fiber is 1.5-2.5.

3. The optical fiber collimator according to claim 2, wherein the optical fiber connecting assembly includes a first connecting optical fiber, a second connecting optical fiber, and a third connecting optical fiber, the optical fiber being fusion-spliced with the second connecting optical fiber through the first connecting optical fiber, and the second connecting optical fiber being fusion-spliced with the incident surface through the third connecting optical fiber.

4. A fiber collimator according to claim 3 wherein the first connecting fiber, the second connecting fiber and the third connecting fiber are coreless fibers.

5. The optical fiber collimator as claimed in claim 1, wherein the hollow sleeve is filled with a first colloid having high temperature resistance and high refractive index.

6. The optical fiber collimator as claimed in claim 1, wherein the hollow sleeve is filled with a first colloid having high temperature resistance and low refractive index.

7. A fibre-optic collimator according to claim 5 or 6 in which the hollow sleeve is a frosted glass tube having a high refractive index.

8. The optical fiber collimator of claim 1, wherein the exit surface is a spherical structure, and the spherical structure is coated with an antireflection film.

9. A fibre collimator according to claim 1 in which the focal point of the lens is disposed on the side of the entrance face facing away from the exit face.

10. The optical fiber collimator as claimed in claim 1, wherein the fusion joints of the connecting optical fibers with the incident surface and the optical fibers are coated with a second colloid; and/or the connecting optical fiber is a coreless optical fiber made of quartz.