Return light processing device and high-power fiber laser

Abstract

The invention discloses a return light processing device. The device comprises a first optical fiber and a second optical fiber, wherein the first optical fiber and the second optical fiber are welded; the diameter of the second optical fiber is not greater than that of the first optical fiber; a first return light part is arranged on the cladding on one side of the input end of the second opticalfiber and is used for leading out return light in a fiber core of the first optical fiber; a bevel angle is arranged on the end face of the output end of the second optical fiber; a second return light part is arranged on the bevel angle, and the second return light part is used for leading out return light in a fiber core of the second optical fiber. The invention also discloses a high-power fiber laser. The return light processing device is simple in structure and small in size, return light in the optical fiber cores can be stably, efficiently and easily processed, the stability of the whole high-power optical fiber laser is improved, and meanwhile the requirement for small-sized mass production of the high-power optical fiber laser is met.

Description

technical field [0001] The invention relates to the field of high-power fiber lasers, and mainly relates to a return light processing device and high-power fiber lasers. Background technique [0002] High-power fiber lasers have been widely used in industrial processing and scientific research applications due to their advantages such as good beam quality, high conversion efficiency, stable output power and flexible output. [0003] In high-power fiber lasers, forward pumping (forward pumping: the pumping method in which the input direction of the pump light is consistent with the direction of the laser output), backward pumping (backward pumping: the input direction of the pumping light The pumping method opposite to the laser output direction) or a bidirectional pumping structure to achieve laser export, due to the existence of Fresnel reflection, high reflectivity can not reach 100% and nonlinear effects, etc., there will always be the required laser transmission The bac...

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Problems solved by technology

[0003] In high-power fiber lasers, forward pumping (forward pumping: the pumping method in which the input direction of the pump light is consistent with the direction of the laser output), backward pumping (backward pumping: the input direction of the pumping light The pumping method opposite to the laser output direction) or a bidirectional pumping structure to achieve laser export, due to the existence of Fresnel reflection, high reflectivity can not reach 100% and nonlinear effects, etc., there will always be the required laser transmission The backward laser in the opposite direction seriously affects the stability of high-power fiber lasers

[0004] At present, the returning light processing device in the prior art mainly relies on the water-cooled absorption bucket to realize the returning light processing, see figure 1 , figure 1 It is a schematic diagram of the structure of a water-cooled absorption funnel in the prior art. The water-cooled absorption funnel accurately fixes the position of the output optical fiber of the return light, and the return light is incident on the interior of the absorption funnel and then converted into heat energy, and then the heat energy is taken away by water cooling to realize the return. The consumption of light, the structural design of the device is relatively complicated, the reliability is low, and it cannot meet the development needs of miniaturization and light weight of high-power fiber lasers

[0005] Moreover, this return light processing device also has disadvantages such as poor stability, volatile pollution, and difficult debugging.

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