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

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 v