CN113690722A

CN113690722A - Liquid cooling device of high-power optical fiber device

Info

Publication number: CN113690722A
Application number: CN202111237082.8A
Authority: CN
Inventors: 刘玙; 黄珊; 郭超; 楚秋慧; 黎玥; 李雨薇; 吴文杰; 黎沁; 李好; 欧光亮
Original assignee: Laser Fusion Research Center China Academy of Engineering Physics
Current assignee: Laser Fusion Research Center China Academy of Engineering Physics
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2021-11-23

Abstract

The invention discloses a liquid cooling device of a high-power optical fiber device, which comprises: the optical fiber device comprises a support, an inner package and an outer package, wherein the support is provided with a U-shaped groove for placing an optical fiber device; the support is embedded in the inner package, the inner package is arranged in the outer package, and a cooling liquid flow passage is formed between the inner package and the outer package. The optical fiber device is in large-area contact with the support, and gap filling is carried out between the optical fiber device and the support by adopting any one or more of soft metal, heat-conducting glue or optical glue. According to the liquid cooling device for the high-power optical fiber device, the soft metal, the heat-conducting glue or the optical glue is used for filling the gap between the optical fiber device and the bracket according to the requirement, so that the direct contact area between the optical fiber device and the bracket is effectively increased, the heat dissipation of the optical fiber device is ensured to the maximum extent, the suspension length of the optical fiber device can be shortened within a certain range, and the problem that the optical fiber device is easy to break due to the fact that the suspension section is too long in the prior art can be solved.

Description

Liquid cooling device of high-power optical fiber device

Technical Field

The invention belongs to the field of lasers, and particularly relates to a liquid cooling device of a high-power optical fiber device.

Background

The optical fiber isolator, beam combiner, beam buncher, fiber grating, cladding light filter, QBH and other optical fiber devices are the basic components of the optical fiber laser. At present, an important direction of the development of the optical fiber laser is to improve the tolerance power of an optical fiber device, and the main factor influencing the tolerance power of the optical fiber device is a thermal effect, so that the improvement of the thermal management capability of the optical fiber device is of great importance for the improvement of the performance level of the optical fiber laser.

In order to realize effective cooling of the optical fiber device, a liquid cooling mode is generally adopted to carry away the photo-induced heat energy and time caused by the optical power loss of the device. In order to avoid the influence of the direct contact between the cooling liquid and the optical fiber on the performance of the optical fiber device, an indirect liquid cooling method is generally adopted in practical engineering application. The structure of the indirect liquid cooling device for the optical fiber device which is commonly used at present is as follows: the device uses the encapsulation to protect the fiber device in the tubulose, and including sealed fixed fiber device of gluing of packing of encapsulation both ends port department, later with interior encapsulation installation in the built-in cavity of outer encapsulation, there is recirculated cooling liquid between interior encapsulation and the outer encapsulation, the circulation through the cooling liquid is dispelled the heat, interior encapsulation adopts the sealed of sealing washer realization cooling liquid with outer encapsulation tip, this structure is present more commonly used fiber device liquid cooling device, can stop the direct contact of fiber device and cooling liquid, but this structure has following defect: 1) the cooling device is not suitable for optical fiber devices with large length, if the length of the optical fiber device is too long, the device is only fixed at two end parts, the middle of the device is suspended, and the bare fiber part is easy to throw excessively and collide with the inner wall of the inner package to break in the environments of vibration, impact and the like; 2) the device is not suitable for the optical fiber device with the coating layer generating heat seriously, the cooling liquid in the device actually only carries out convection evacuation on heat on the inner packaging, the heat dissipation effect on the optical fiber device inside the inner packaging is limited, and for some optical fiber devices which are easy to generate heat on the coating layer, the optical fiber device has the risk of burning if the heating area of the optical fiber coating layer cannot be effectively and pertinently cooled due to the fact that the tolerance temperature of the coating layer is only more than one hundred.

Therefore, in order to solve the problems that the applicability of the indirect liquid cooling device for the optical fiber device is limited and the cooling effect on the optical fiber device is limited at present, the patent provides a liquid cooling device for a high-power optical fiber device.

Disclosure of Invention

In view of the above, the present invention provides a liquid cooling apparatus for a high power optical fiber device, the apparatus comprising: the optical fiber device comprises a support, an inner package and an outer package, wherein the support is a long-strip support with a groove on the upper surface, the cross section of the support is concave, and a U-shaped groove of the support is used for placing an optical fiber device; the inner package is a cylinder with a hollow cavity I, and the cross section of the hollow cavity I is rectangular; the outer package is provided with a cylindrical hollow cavity II, and the diameter of the hollow cavity II is larger than the outer diameter of the inner package;

the bracket is embedded into the hollow cavity I of the inner package, and the outer surface of the bracket is tightly matched with the wall surface of the hollow cavity I of the inner package; the inner sealing device is arranged in an externally-sealed cylindrical hollow cavity II, and a gap is formed between the inner sealing device and the hollow cavity II and is a cooling liquid flow channel; the two ends of the inner package and the hollow cavity II are sealed by sealing pieces; a liquid inlet hole and a liquid outlet hole are formed in the outer surface of the outer package, and the two holes are communicated with the hollow cavity II; a gap between a heating area of the optical fiber device and the U-shaped groove of the bracket is filled with one or more of soft metal, heat-conducting glue or optical glue; the thermal conductivity of the support, the inner package and the outer package is hundreds of W/m/K or more.

Preferably, the upper surfaces of the two end parts of the bracket are provided with U-shaped grooves, and the middle part of the bracket is provided with a cavity.

The invention has the beneficial effects that: according to the liquid cooling device for the high-power optical fiber device, the optical fiber device is in large-area contact with the bracket, so that heat generated by the optical fiber device can be quickly and effectively released into cooling liquid through a high-thermal-conductivity material; secondly, the positions of the optical fiber devices coated with materials such as soft metal, heat-conducting glue, optical glue and the like can be coated as required, for example, the positions can be coated with areas which are easy to heat such as an optical fiber coating layer and the like in a whole section, so that the heat dissipation of the optical fiber coating layer can be ensured to the maximum extent, for example, the areas such as an optical fiber melting point and the like can be prevented from being coated, and the light leakage of the optical fiber devices can be prevented from being intensively injected into the coating materials to cause the rapid heating of the coating materials; the suspended length of the optical fiber device can be shortened by coating the material, so that the device is prevented from being broken in practical application environments such as vibration impact and the like; the liquid cooling inner chamber is sealed by sealing pieces such as sealing rings, sealing glue and the like at two ends, and leakage of cooling liquid can be effectively prevented.

Drawings

FIG. 1 is a schematic diagram of a liquid cooling apparatus for a high power optical fiber device according to the present invention;

FIG. 2 is a schematic view of a stent structure according to an embodiment of the present invention;

FIG. 3 is a longitudinal cross-sectional view of a liquid cooling arrangement of the high power fiber optic device of FIG. 1;

in the figure: 1. the optical fiber device comprises a support 2, an inner package 3, an outer package 4, a liquid inlet hole 5, a liquid outlet hole 6, a sealing element 7, a cooling liquid runner 8, an optical fiber device 9, a U-shaped groove 10 and a hollow cavity.

Detailed Description

It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.

The invention is described in detail below with reference to the figures and specific embodiments.

A liquid cooling apparatus for a high power fiber optic device as shown in fig. 1 and 3, the apparatus comprising: the optical fiber device comprises a support 1, an inner package 2 and an outer package 3, wherein the support 1 is a long strip support with a U-shaped groove on the upper surface, the cross section of the support is concave, and the U-shaped groove is used for placing an optical fiber device 8; the inner package 1 is a cylinder with a hollow cavity I, and the cross section of the hollow cavity I is rectangular; the outer package 3 is provided with a cylindrical hollow cavity II, and the diameter of the hollow cavity II is larger than the outer diameter of the inner package;

the bracket 1 is embedded into the hollow cavity I of the inner package 2, and the outer surface of the bracket 1 is tightly matched with the wall surface of the hollow cavity I of the inner package 2; the inner package 2 is arranged in the cylindrical hollow cavity II of the outer package 3, a gap exists between the inner package 2 and the hollow cavity II, the gap serves as a cooling liquid flow channel 7, the two ends of the inner package 2 and the hollow cavity II are sealed through sealing pieces 6, each sealing piece 6 comprises a sealing ring or sealant, the end face sealing effect can be achieved when the sealing pieces 6 are connected with the inner package 2 and the outer package 3, cooling liquid can flow between the outer package 3 and the inner package 2, and the cooling liquid cannot leak out of the package structure from the two ends; the outer surface of the outer package 3 is provided with a liquid inlet hole 4 and a liquid outlet hole 5, and the two holes are communicated with the hollow cavity II; a gap between the heating area of the optical fiber device 8 and the U-shaped groove of the bracket 1 is filled with any one or more of soft metal, heat-conducting glue or optical glue; the support 1, the inner package 2 and the outer package 3 are all made of high thermal conductivity materials.

The packaging process of the liquid cooling device of the high-power optical fiber device is as follows: firstly, placing an optical fiber device 8 in a U-shaped groove of a bracket 1, filling a gap between the optical fiber device 8 and an inner groove of the bracket 1 by using any one or more of soft metal, heat-conducting glue or optical glue, wherein the glue can fill the whole section of the inner groove or only coat a heating area on the device, such as an optical fiber coating layer, according to the type of the optical fiber device 8; then, the bracket 1 is axially plugged from one end of the inner package 2 to the other end, and the bracket and the inner package are fixed by using glue; and finally, the inner package 2 is axially plugged from one end of the outer package 3 to the other end, and the two ends of the inner package and the outer package are fixed by sealing elements 7 such as sealing rings or sealant and the like.

The heat that fiber device 8 produced is conducted on support 1 through the contact of device self and support 1 inside groove and the contact of device through gap filler material and support inside groove, and the heat of support 1 is conducted on interior encapsulation 2 through the close contact of the support 1 outside and interior encapsulation 2 inner wall, and the heat of interior encapsulation 2 is taken away through the coolant liquid convection heat dissipation of circulation between the inside and outside encapsulation.

As shown in fig. 2, as an embodiment, the above-mentioned support 1 may be designed as a structure in which two end portions have U-shaped grooves on the upper surface and a cavity is formed in the middle portion, and this structure is particularly suitable for an optical fiber device with a relatively strong leakage light ratio, such as a cladding light filter, where the middle leakage light portion of the optical fiber device is suspended on the hollow cavity axis and the coating layer portion is disposed in the U-shaped inner groove of the support 1, so that on one hand, most of the cladding leakage light of the optical fiber device directly irradiates and heats the inner wall of the inner package 2, and the inner package 2 directly contacts with the cooling liquid, and the heat dissipation rate is faster than that of the support 1, so that this structure can release the heat generated by the cladding leakage light more efficiently, and on the other hand, it can effectively ensure that the heat energy on the coating layer due to the cladding return light is quickly conducted away to the cooling liquid through the inner package 2 via the support 1.

Claims

1. A liquid cooling apparatus for a high power optical fiber device, the apparatus comprising: the optical fiber device comprises a support (1), an inner package (2) and an outer package (3), wherein the support (1) is a long-strip support with a groove on the upper surface, the cross section of the support (1) is concave, and a U-shaped groove of the support is used for placing an optical fiber device; the inner package (2) is a cylinder with a hollow cavity I, and the cross section of the hollow cavity I is rectangular; the outer package (3) is provided with a cylindrical hollow cavity II, and the diameter of the hollow cavity II is larger than the outer diameter of the inner package (2);

the bracket (1) is embedded into the hollow cavity I of the inner package (2), and the outer surface of the bracket (1) is tightly matched with the wall surface of the hollow cavity I of the inner package (2); the inner package (2) is arranged in a cylindrical hollow cavity II of the outer package (3), a gap exists between the inner package and the hollow cavity II, the gap is a cooling liquid flow channel (7), and two ends of the inner package (2) and two ends of the hollow cavity II are sealed by sealing pieces (6); the outer surface of the outer package (3) is provided with a liquid inlet hole (4) and a liquid outlet hole (5), and the two holes are communicated with the hollow cavity II; a gap between a heating area of the optical fiber device and the U-shaped groove of the bracket (1) is filled with one or more of soft metal, heat-conducting glue or optical glue.

2. The liquid cooling apparatus for high power optical fiber device as claimed in claim 1, wherein the bracket (1) has two ends with U-shaped grooves on the upper surface and a hollow cavity in the middle.