WO2023155602A1

WO2023155602A1 - Cladding light stripper and manufacturing method therefor

Info

Publication number: WO2023155602A1
Application number: PCT/CN2022/142459
Authority: WO
Inventors: 张磊; 祝启欣; 周叶; 王争; 闫大鹏
Original assignee: 武汉锐科光纤激光技术股份有限公司
Priority date: 2022-02-17
Filing date: 2022-12-27
Publication date: 2023-08-24
Also published as: CN114185132B; CN114185132A

Abstract

Disclosed in the present invention are a cladding light stripper and a manufacturing method therefor. The cladding light stripper comprises a fiber core and a first cladding; the fiber core is provided with a cladding light stripping region; a plurality of inclined holes are formed on the first cladding located in the cladding light stripping region; a preset included angle is formed between the axis direction of the inclined holes and the extension direction of the fiber core; and the periphery of the first cladding located in the cladding light stripping region and the hole walls of the inclined holes all are provided with metal nanomaterial coatings. The present invention improves a heat dissipation effect, mechanical strength, and corrosion resistance.

Description

A cladding optical stripper and its manufacturing method

technical field

The invention belongs to the technical field of lasers, in particular to a cladding optical stripper and a manufacturing method thereof.

Background technique

Fiber lasers mostly use cladding pumping to convert pump light into laser light. In this pumping mode, a small amount of pump light cannot be absorbed and remains in the cladding, and part of the generated laser light will leak into the cladding, and the remaining pump light and laser light in the cladding will be lost during transmission. The damage to the fiber optic device will seriously affect the performance and life of the fiber laser.

At present, the cladding light stripper can effectively strip the cladding light in the fiber laser by destroying the cladding structure of the fiber, so that the cladding light leaks out of the fiber. Existing cladding optical strippers are mainly manufactured by high-glue coating, chemical etching or laser etching. Among them, high-glue coating is to use glue with a higher refractive index than the fiber cladding to coat the surface of the fiber cladding. This method is relatively concentrated in heat and is limited by the performance of the glue, so it is difficult to work in a high temperature environment. The chemical etching method is to use chemicals to corrode the fiber cladding to roughen the surface, but it will reduce the mechanical strength of the fiber. The method of laser etching is to use laser to etch the cladding of the optical fiber, but it will make the surface rough and reduce the heat dissipation effect.

technical problem

How to improve the heat dissipation effect while ensuring the mechanical strength of the optical fiber.

technical solution

In order to achieve the above object, the application provides a cladding optical stripper, comprising a core and a first cladding coated on the outer periphery of the core, the core has a cladding optical stripping region, located in the cladding The first cladding of the optical stripping area is provided with a plurality of oblique holes, the axis direction of the oblique holes forms a preset angle with the extending direction of the fiber core, and the The outer periphery of the first cladding layer and the hole wall of the inclined hole are both provided with a metal nanomaterial coating.

As a preferred technical solution of a cladding optical stripper, the metal nanomaterial coating is made of any one or several of gold, silver and palladium.

As a preferred technical solution of a cladding optical stripper, the preset included angle is greater than 0° and less than 90°.

As a preferred technical solution of a cladding optical stripper, the slanted hole penetrates the first cladding, and there is a part of the first cladding between the slanting hole and the fiber core.

As a preferred technical solution of a cladding optical stripper, the oblique hole is a blind hole, and there is part of the first cladding between the blind hole and the fiber core.

As a preferred technical solution of a cladding optical stripper, the fiber core further has an input region, and the first cladding located in the input region is covered with a second cladding.

As a preferred technical solution of a cladding light stripper, the fiber core also has an output area, the cladding light stripping area is located between the input area and the output area, and the The first cladding is covered with a third cladding.

As a preferred technical solution of a cladding optical stripper, the cross-sectional areas of the multiple oblique holes in the radial direction are the same; or

The radial cross-sectional area of at least one of the inclined holes is different from the radial cross-sectional area of the rest of the inclined holes.

The present application also provides a method for manufacturing a cladding light stripper, which is suitable for the cladding light stripper in any of the above-mentioned schemes. The core of the optical fiber has a cladding light stripping region. The manufacturing method includes:

Removing the remaining cladding except the first cladding outside the cladding optical stripping area of the fiber core;

Open multiple oblique holes in the first cladding;

A coating of metal nanomaterials is coated on the periphery of the first cladding layer located in the cladding light stripping area and the hole walls of the inclined holes.

Beneficial effect

The cladding optical stripper, by opening a plurality of oblique holes on the first cladding, can increase the heat dissipation area and improve the heat dissipation effect; The metal nanomaterial coating can absorb cladding light and spread heat evenly, and can also improve mechanical strength and corrosion resistance.

Description of drawings

Fig. 1 is a structural schematic diagram 1 of the cladding optical stripper provided by the present application;

Fig. 2 is the structural schematic diagram II of the cladding optical stripper provided by the present application;

FIG. 3 is the third structural schematic diagram of the cladding optical stripper provided in this application.

in:

101. Cladding light stripping area; 102. Input area; 103. Output area;

1. Fiber core; 2. First cladding; 21. Inclined holes; 3. Second cladding; 4. Third cladding.

Embodiments of the present invention

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the invention is used, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Connected integrally; either mechanically or electrically. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

As shown in Figure 1, the present embodiment provides a kind of cladding light stripper, and this cladding light stripper comprises fiber core 1 and the first cladding layer 2 that is coated on the periphery of fiber core 1, and fiber core 1 has cladding light In the stripping area 101, a plurality of oblique holes 21 are opened on the first cladding layer 2 of the cladding optical stripping area 101. The axial direction of the oblique holes 21 forms a preset angle with the extension direction of the fiber core 1, and is located in the cladding optical stripping area. The outer periphery of the first cladding layer 2 of the region 101 and the hole walls of the inclined holes 21 are all provided with metal nanomaterial coatings.

It can be understood that by opening a plurality of oblique holes 21 on the first cladding layer 2 located in the cladding light stripping region 101, the heat dissipation area can be increased and the heat dissipation effect can be improved. The outer periphery of the cladding 2 and the walls of the inclined holes 21 are provided with metal nanomaterial coatings, which can absorb cladding light and evenly diffuse heat, and can also improve mechanical strength and corrosion resistance.

It should be noted that, in this embodiment, the metal nanomaterial coating is made of any one or several of gold, silver and palladium. In addition, in this embodiment, the aforementioned preset included angle is greater than 0° and less than 90°. Of course, in other embodiments, the preset included angle may also be equal to 90°.

Referring to FIG. 1 , in this embodiment, the slanted hole 21 penetrates through the first cladding 2 , and there is a part of the first cladding 2 between the slanted hole 21 and the fiber core 1 . It can be understood that although the oblique hole 21 penetrates through the first cladding 2 , it does not contact the fiber core 1 , so as to prevent the oblique hole 21 from affecting the transmission of light in the fiber core 1 . Certainly, the oblique hole 21 may also be a blind hole, and there is part of the first cladding 2 between the blind hole and the fiber core 1 . In addition, as shown in FIG. 2 , among the plurality of inclined holes 21 on the first cladding layer 2 , some inclined holes 21 may be blind holes, and some inclined holes 21 may be through holes.

Referring again to FIG. 1 , in this embodiment, the inclined hole 21 is a circular hole. Of course, as shown in FIG. 3 , the inclined hole 21 can also be a polygonal hole, such as a triangular hole, a square hole, and the like. In addition, in other embodiments, the shape of at least one slanted hole 21 among the plurality of slanted holes 21 may be different from that of the remaining slanted holes 21, for example, at least one slanted hole 21 is a triangular hole, and the remaining slanted holes 21 are round hole.

In addition, in this embodiment, the cross-sectional areas of the plurality of inclined holes 21 in the radial direction thereof are equal. Of course, in other embodiments, it is also possible that the radial cross-sectional area of at least one inclined hole 21 is different from the radial cross-sectional area of the rest of the inclined holes 21 . For example, in this embodiment, the inclined holes 21 are circular holes with the same diameter, while in other embodiments, the plurality of inclined holes 21 are circular holes with different diameters or the shapes of the plurality of inclined holes 21 are different.

It should also be noted that the positions of the plurality of inclined holes 21 can be flexibly adjusted to meet the demands of cladding light stripping with different powers. In addition, the plurality of oblique holes 21 may be uniformly arranged on the fiber core 1 or may be arranged irregularly.

As shown in FIG. 1 , the fiber core 1 also has an input region 102 , and the first cladding layer 2 located in the input region 102 is covered with a second cladding layer 3 . The above fiber core 1 also has an output region 103 , the cladding optical stripping region 101 is located between the input region 102 and the output region 103 , and the first cladding layer 2 located in the output region 103 is covered with the third cladding layer 4 . It should be noted that the materials of the second cladding layer 3 and the third cladding layer 4 are the same.

This embodiment also provides a method for manufacturing a cladding light stripper, which is suitable for the above-mentioned cladding light stripper. Specifically, the core 1 of the optical fiber has a cladding optical stripping region 101, and the manufacturing method of the cladding optical stripping device includes:

Removing the remaining cladding except the first cladding 2 except the cladding optical stripping region 101 of the fiber core 1;

A plurality of oblique holes 21 are opened in the first cladding layer 2 ; wherein, the oblique holes 21 are processed on the first cladding layer 2 by means of laser etching.

A metal nanomaterial coating is coated on the outer periphery of the first cladding layer 2 located in the cladding light stripping region 101 and the hole walls of the inclined holes 21 .

The cladding light stripper made by the above cladding light stripper manufacturing method can increase the heat dissipation area and improve the heat dissipation effect, and the metal nanomaterial coating can absorb the cladding light and make the heat evenly diffuse, and can also improve the mechanical strength and Corrosion resistance.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

A cladding optical stripper, wherein, it includes a core and a first cladding covering the outer periphery of the core, the core has a cladding optical stripping area, and the cladding optical stripping area is located in the cladding optical stripping area. The first cladding is provided with a plurality of oblique holes, the axial direction of the oblique holes forms a preset angle with the extending direction of the fiber core, and is located on the outer periphery of the first cladding in the optical stripping region of the cladding. And the hole walls of the inclined holes are all provided with a metal nanomaterial coating;

The slanted hole runs through the first cladding, and there is a part of the first cladding between the slanted hole and the fiber core.
The cladding optical stripper according to claim 1, wherein the metal nanomaterial coating is made of any one or several of gold, silver and palladium.
The cladding optical stripper according to claim 1, wherein the preset included angle is greater than 0° and less than 90°.
The cladding optical stripper according to claim 1, wherein the fiber core further has an input region, and the first cladding layer located in the input region is covered with a second cladding layer.
The cladding light stripper according to claim 4, wherein the fiber core further has an output region, the cladding light stripping region is located between the input region and the output region, and is located at the end of the output region The first cladding is covered with a third cladding.
The cladding optical stripper according to claim 5, wherein the second cladding and the third cladding are made of the same material.
The cladding light stripper according to claim 1, wherein the cross-sectional areas of the plurality of oblique holes in the radial direction are the same.
The cladding optical stripper according to claim 1, wherein at least one of said slanted holes has a cross-sectional area in its radial direction different from that of the rest of said slanted holes in its radial direction.
The cladding light stripper according to claim 1, wherein, among the plurality of oblique holes on the first cladding layer, some of the oblique holes are blind holes, and some of the oblique holes are through holes.
The cladding optical stripper according to claim 1, wherein the oblique hole is a circular hole.
The cladding optical stripper according to claim 1, wherein the oblique hole is a deformable hole.
The cladding optical stripper according to claim 11, wherein the oblique holes are triangular holes or square holes.
The cladding optical stripper according to claim 1, wherein the plurality of oblique holes are circular holes with different diameters.
The cladding light stripper according to claim 1, wherein the radial cross-sectional areas of the plurality of oblique holes are not equal.
The cladding optical stripper according to claim 1, wherein at least one of said slanted holes has a cross-sectional area in its radial direction different from that of the rest of said slanted holes in its radial direction.
The cladding light stripper according to claim 1, wherein a plurality of said oblique holes are evenly arranged on said fiber core.
The cladding optical stripper according to claim 1, wherein the preset included angle is greater than 0° and less than 90°;

The fiber core also has an input region, and the first cladding layer located in the input region is covered with a second cladding layer;

The fiber core also has an output region, the cladding optical stripping region is located between the input region and the output region, and the first cladding layer located in the output region is covered with a third cladding layer, The materials of the second cladding and the third cladding are the same;

The radial cross-sectional areas of the plurality of inclined holes are the same.
A method for making a cladding light stripper, wherein, applicable to the cladding light stripper as claimed in claim 1, the core of the optical fiber has a cladding light stripping region, and the manufacturing method comprises:

Removing the remaining cladding except the first cladding outside the cladding optical stripping area of the fiber core;

Open multiple oblique holes in the first cladding;

A coating of metal nanomaterials is coated on the periphery of the first cladding layer located in the cladding light stripping area and the hole walls of the inclined holes.
The manufacturing method of a cladding light stripper according to claim 18, wherein the preset included angle is greater than 0° and less than 90°.
The manufacturing method of a cladding light stripper according to claim 18, wherein the fiber core further has an input region, and the first cladding layer located in the input region is covered with a second cladding layer.