阅读说明：本技术 一种大功率激光耦合结构 (High-power laser coupling structure ) 是由 黄媛媛 白江浩 徐金玲 李鑫 姚梦远 张嘉骏 李翔 甘军宁 黄鸿宇 于 2020-05-27 设计创作，主要内容包括：一种大功率激光耦合结构,包括：第一插针、第二插针和套管。光纤组使用环氧胶永久的固定在插芯中；接触件放置于壳体中；接触件与接触件在套筒中进行对接。本发明适用于大功率激光传输,插入损耗低、光学端面激光能量密度低,有效防止光学端面受激光烧蚀,同时加工难度小。(A high power laser coupling structure comprising: the device comprises a first contact pin, a second contact pin and a sleeve. The optical fiber group is permanently fixed in the inserting core by using epoxy glue; the contact piece is placed in the shell; the contact piece and the contact piece are butted in the sleeve. The invention is suitable for high-power laser transmission, has low insertion loss and low laser energy density of the optical end face, effectively prevents the optical end face from being ablated by laser, and has small processing difficulty.)

1. A high power laser coupling structure, comprising: a first contact pin (1), a second contact pin (2) and a sleeve (3);

the first contact pin (1) and the second contact pin (2) are radially fixed through the sleeve (3), so that the axial alignment of the first contact pin (1) and the second contact pin (2) is realized; the contact end surfaces of the first contact pin (1) and the second contact pin (2) are positioned in the sleeve (3);

the first pin (1) and the second pin (2) both comprise: a self-focusing optical fiber (301), a common single-mode optical fiber (302) and a ferrule (202);

the self-focusing optical fiber (301) and the common single-mode optical fiber (302) are fused to form an integrated structure in a laser or arc discharge mode, and the connection point of the self-focusing optical fiber (301) and the common single-mode optical fiber (302) serves as a fusion point (303);

the ferrule (202) is of an axial hollow structure, and the fixed ferrule (202) is circumferentially wrapped and fixed by the self-focusing optical fiber (301) and the common single-mode optical fiber (302); the fusion point (303) is located inside the ferrule (202).

2. A high power laser coupling structure according to claim 1, wherein the self-focusing optical fiber (301) has the same outer diameter as the common single mode optical fiber (302), and the fusion point (303) formed by fusing the self-focusing optical fiber and the common single mode optical fiber has the same outer diameter as the common single mode optical fiber.

3. The high-power laser coupling structure according to claim 1, wherein the front end face (203) of the self-focusing fiber (301) is retracted into the ferrule (202), and the axial distance between the front end face (203) of the self-focusing fiber (301) and the front end face (204) of the ferrule (202) ranges from 0 mm to 0.5 mm.

4. A high power laser coupling structure according to any one of claims 1 to 3, wherein the end face of the ferrule (202) is chamfered.

5. The high-power laser coupling structure according to claim 4, wherein the self-focusing optical fiber (301), the common single-mode optical fiber (302) and the ferrule (202) are fixed by epoxy glue.

6. A high power laser coupling structure according to claim 4, characterized in that the outer wall of the ferrule (202) and the inner wall of the sleeve (3) are in interference fit.

Technical Field

The invention relates to the field of optical fiber connectors, in particular to a high-power optical fiber connector.

Background

The traditional single-mode optical fiber connector mostly adopts a physical connection mode, namely, the end face of a single-mode optical fiber is in direct contact with the end face of the single-mode optical fiber so as to realize low-loss transmission of optical signals. The connection mode is not suitable for high-power laser transmission application and mainly comprises the following aspects:

1. when the traditional single-mode optical fiber connector is used for high-power laser transmission, the laser power density of the output end face and the input end face of the optical fiber is high, and once the laser power density exceeds the damage threshold of an optical fiber material, the end face of the optical fiber is easily burnt, and the light energy cannot be continuously transmitted.

2. When high-power laser passes through the output end surface and the input end surface of the optical fiber, the tiny surface quality defects of the end surface of the optical fiber, such as impurities, scratches, micro defects and the like, cause abnormal absorption of laser energy, lead to the end surface of the optical fiber to be burnt and cannot continuously transmit light energy.

3. When high-power laser passes through the output end surface and the input end surface of the optical fiber, any pollutants on the end surface of the optical fiber, such as dust, dirt and the like, can cause abnormal absorption of laser energy, lead to the end surface of the optical fiber to be burnt, and cannot continuously transmit light energy.

4. When the traditional physical contact type single-mode optical fiber connector is repeatedly plugged and pulled out for use, the end face of an optical fiber is easily worn, once the end face of the optical fiber is damaged, the damaged end face of the optical fiber is easily subjected to abnormal absorption of laser energy when transmitting high-power laser, the end face of the optical fiber is burnt, and light energy cannot be continuously transmitted.

Aiming at the application requirements of the high-power laser single-mode transmission, a non-contact optical fiber connector adopting a lens for expanding beams is provided at present, but the connector adopts the lens for non-contact connection between optical fibers, and has the defects of large transmission loss, poor interchangeability, large difficulty in part processing and assembly and high cost.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a high-power laser coupling structure, and particularly provides an optical fiber connector for high-power laser transmission, which has the advantages of good performance, high reliability, small processing and assembling difficulty, low precision requirement and long service life.

The above purpose of the invention is realized by the following technical scheme:

a high power laser coupling structure comprising: the device comprises a first contact pin, a second contact pin and a sleeve;

the first contact pin and the second contact pin are radially fixed through the sleeve, so that the first contact pin and the second contact pin are axially centered; the contact end surfaces of the first contact pin and the second contact pin are positioned in the sleeve;

the first contact pin and the second contact pin both comprise: self-focusing optical fiber, common single-mode optical fiber and ferrule;

the self-focusing optical fiber and the common single-mode optical fiber are fused to form an integrated structure in modes of laser or arc discharge and the like, and a connection point of the self-focusing optical fiber and the common single-mode optical fiber is used as a fusion point;

the core insert is of an axial hollow structure, and the self-focusing optical fiber and the common single-mode optical fiber are circumferentially wrapped and fixed with the core insert; the welding point is positioned inside the inserting core;

the self-focusing optical fiber and the common single-mode optical fiber have the same outer diameter size, and a fusion point formed by melting the self-focusing optical fiber and the common single-mode optical fiber also has the same outer diameter size as the fusion point.

The front end face of the self-focusing optical fiber retracts into the ferrule, and the axial distance between the front end face of the self-focusing optical fiber and the front end face of the ferrule ranges from 0 mm to 0.5 mm.

The end face of the inserting core is provided with a chamfer.

The self-focusing optical fiber, the common single-mode optical fiber and the inserting core are fixedly bonded through epoxy glue.

The outer wall of the inserting core is in interference fit with the inner wall of the sleeve.

Compared with the prior art, the invention has the following advantages:

1) the invention adopts the self-focusing optical fiber to enlarge the beam diameter of the common single-mode optical fiber by 3-5 times or more, thereby greatly reducing the laser energy density on the end surface of the optical fiber, effectively preventing the end surface of the optical fiber from being ablated, and improving the laser power difficult-to-bear capacity of the whole device to dozens of watts or more.

2) The invention adopts the self-focusing optical fiber with the same outer diameter as the common single-mode optical fiber to carry out beam shaping, thereby effectively improving the precision of the assembly process and realizing the low-loss and high-reliability transmission of high-power laser; meanwhile, the assembly process difficulty is greatly reduced, so that the processing cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a coupling device according to the present invention;

FIG. 2 is a schematic diagram of a pin structure according to the present invention;

FIG. 3 is a schematic diagram of the structure and beam shaping principle of the optical fiber set according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples:

the invention provides a high-power laser coupling structure which is suitable for high-power laser transmission and has the advantages of low loss, high reliability, low assembly difficulty and long service life.

A high power laser coupling structure comprising: a first pin 1, a second pin 2 and a sleeve 3. The first contact pin 1 and the second contact pin 2 are radially fixed through the sleeve 3, so that the axial alignment of the first contact pin 1 and the second contact pin 2 is realized; the contact end surfaces of the first contact pin 1 and the second contact pin 2 are positioned in the sleeve 3; first pin 1, second pin 2 all include: a self-focusing optical fiber 301, a common single mode optical fiber 302 and a ferrule 202;

the self-focusing optical fiber 301 and the common single-mode optical fiber 302 are fused to form an integrated structure through laser or arc discharge and other modes, so that the self-focusing optical fiber 301 and the common single-mode optical fiber 302 are permanently and fixedly connected. The connection point of the self-focusing optical fiber 301 and the common single-mode optical fiber 302 is used as a fusion point 303;

the ferrule 202 is of an axial hollow structure, and the self-focusing optical fiber 301 and the common single-mode optical fiber 302 circumferentially wrap the fixed ferrule 202; the welding point 303 is positioned inside the ferrule 202;

the self-focusing optical fiber 301 has the same outer diameter as that of the common single-mode optical fiber 302, and the fusion point 303 formed by melting the two optical fibers also has the same outer diameter as that of the two optical fibers.

The front end face 203 of the self-focusing optical fiber 301 retracts into the ferrule 202, and the axial distance between the front end face 203 of the self-focusing optical fiber 301 and the front end face 204 of the ferrule 202 ranges from 0 mm to 0.5 mm. The end face of the ferrule 202 is provided with a chamfer. The self-focusing optical fiber 301, the common single-mode optical fiber 302 and the ferrule 202 are fixed by epoxy glue. The outer wall of the ferrule 202 and the inner wall of the sleeve 3 are interference fit.