Heat dissipation device for double-clad fiber grating of high-power fiber laser

Abstract

The invention belongs to the field of fiber lasers, and relates to a heat dissipation device for a double-clad fiber grating of a high-power fiber laser. Existing heat dissipation devices are complicated in structure, and the double-clad fiber grating is easy to break when working for a long time. The invention provides a heat dissipation device for a double-clad fiber grating of a high-power fiber laser, comprises a shell and a double-clad fiber grating arranged in the shell, and is characterized in that the heat dissipation device also includes an inner core, the double-clad fiber grating isembedded in the inner core, and the shell sleeves the inner core. The heat dissipation device of the invention adopts a nested structure, the inner core is made of silicon-aluminum alloy material with a low coefficient of expansion, and the shell is made of aluminum alloy or copper alloy material with high thermal conductivity, which can not only ensure the rapid dissipation of heat, but also hasa simple packaging structure and the double-clad fiber grating is not liable to break.

Description

technical field [0001] The invention belongs to the field of fiber lasers, in particular to heat dissipation of double-clad fiber gratings for fiber lasers, and specifically refers to a heat dissipation device for double-clad fiber gratings used in high-power fiber lasers. Background technique [0002] At present, high-power fiber lasers have begun to enter various industries. The development of high-power fiber lasers in cutting, welding, heat treatment, laser marking, laser engraving, laser medical equipment and instruments has huge market potential, even at the level of 100,000 watts. Fiber laser company IPG of the United States has entered the field of military weapons and equipment. [0003] With the development of high-power semiconductor laser pumping, double-clad fiber manufacturing technology and double-clad fiber grating manufacturing technology, the output power level of fiber lasers has increased rapidly, and the output of a single fiber has reached the level of ...

AI Technical Summary

Problems solved by technology

[0005] Patent No. CN201110264460.1 discloses a packaging device for double-clad fiber gratings for high-power fiber lasers. It encapsulates the bare fiber of double-clad fiber gratings in a metal shell, and pots them in the metal shell. There is a refractive index matching liquid, and the heat is dissipated by the refractive index matching liquid after passing through the fiber grating. However, because the fiber grating will generate a lot of heat when it is working, the refractive index matching liquid will evaporate under the long-term working state, which will affect the performance of the device. Service life; at the same time, due to the small expansion coefficient of the fiber Bragg grating, the expansion coefficient of the metal shell is relatively large, and because the expansion coefficient of the two materials is too different, the fiber Bragg grating is easy to break under high temperature conditions

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