Refrigerating method of high-capacity optical fiber laser

Abstract

The invention relates to a refrigeration method for a high-power fiber laser and a high-power fiber amplifier. The method is carried out by use of a fiber laser, emulsus liquid or solid powder, a metal sleeve provided with a cooling passage, a metallic conduit and so on; an optical fiber is wound on the metallic conduit and positioned inside the metal sleeve provided with the cooling passage; a gap between the optical fiber and the metal sleeve is filled with the emulsus liquid or the solid powder of a high coefficient of heat conduction; the insides of both the metallic conduit and the cooling passage adopt a method of using flow cooling fluid to take away heat generated by the running high-power fiber laser; therefore, an extramural cladding and end faces of the optical fiber are not damaged by heat, and continuous steady operation of the high-power fiber laser is guaranteed.

Description

technical field [0001] The invention relates to a refrigeration method for a high-power fiber laser and a high-power fiber amplifier. Background technique [0002] Fiber lasers are lasers that use doped fibers as the laser medium. It obtains the laser output of the corresponding band by doping different rare earth ions in the fiber matrix material. For conventional single-mode fiber lasers, the pump light injected into the fiber core must also be single-mode, which limits the efficiency of pump light into the fiber, resulting in low output power and efficiency of fiber lasers. The concept of double-clad fiber was proposed in the late 1980s, which provided an effective technical way to improve the output power and conversion efficiency of fiber lasers, and changed the history that fiber lasers can only be used as a low-power optical device. With the development of double-clad fiber manufacturing technology and high-power semiconductor laser pumping technology, the output po...

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Problems solved by technology

Document 3 proposes a cooling device for the output end of a high-power double-clad fiber laser. The optical fiber needs to be placed in the fiber groove milled on the metal sleeve. The air medium is introduced in between, which reduces the cooling effect; if the size of the fiber groove is smaller than the size of the fiber, it is easy to cause damage to the structure of the fiber, and there is only one coolant inlet and outlet tube in the metal sleeve, and the contact area between the metal and the coolant is small. It is bene

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