Variable diameter cooling device for high power optical fiber laser optical fiber

Abstract

The invention provides a variable diameter cooling device for high power optical fiber laser optical fiber. The variable diameter cooling device comprises a variable diameter cooling bucket, a coolingbucket base and a cooling base plate, a microchannel optical fiber groove with a spirally variable diameter is formed in the outer surface of the variable diameter cooling bucket, by adjusting the length of the optical fiber winding around the variable diameter cooling bucket, heat dissipation of an optical fiber body can be achieved, and the diameter for optical fiber winding can also be controlled; the cooling bucket base and the cooling base plate are both provided with optical fiber microchannel guide cooling grooves, and the optical fiber microchannel guide cooling grooves are used for cooling and guiding the optical fiber. The variable diameter cooling device has the advantages that on the premise of guaranteeing optical fiber cooling, the optical fiber diameter is continuously adjustable, in the diameter varying process, no device needs to be replaced, and the variable diameter cooling device has the advantages of being high in integration, high in stability, high in extensibility, convenient to operate and the like.

Description

technical field [0001] The invention relates to the technical field of laser optical fiber cooling, in particular to a variable-diameter cooling device for optical fibers of high-power optical fiber lasers. Background technique [0002] Fiber lasers have the advantages of high electro-optical conversion efficiency, good output beam quality, convenient thermal management, stable operation, etc., and have been a hot research topic for researchers in recent years. From the 50mW laser output of Gapontsev et al. in 1991 to the 10KW single-mode laser output of IPG in 2009, the output power of fiber lasers has grown exponentially. While the power is increasing, researchers have higher and higher requirements for the quality of the output laser beam. come higher. [0003] At present, there are mainly two structures of fiber lasers, one is the fiber Bragg grating (FBG) structure, and the other is the main oscillation power amplification (MOPA) structure. For fiber lasers with two s...

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Problems solved by technology

[0004] Existing optical fiber cooling devices mostly use coiling methods on cylinders or cooling plates to cool optical fibers (such as CN201210362883.1, CN201520088049.7, CN201610459695.9). These devices have the following disadvantages: (1) The optical fibers are closely arranged Together, it is not conducive to the heat dissipation between optical fibers, resulting in uneven heat dissipation; (2) There is an overlapping place between the entrance and exit of the optical fiber, and the temperature of the overlapping point is too high, which increases the probability of optical fiber burning; (3) The diameter of the optical fiber coil Unchangeable, when used for mode filtering of high-power optical fibers, the optical fiber is directly coiled into a small circle, and the heat load at the initial end of the small circle increases, increasing the probability of fiber burnout; (4) The diameter of the optical fiber coil is not variable, if you need to change Diameter, the need to replace the water-cooled barrel or water-cooled plate, the operation is cumbersome

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