Fiber cladding light stripper for high-power fiber laser

Abstract

The invention relates to a fiber cladding light stripper for a high-power fiber laser, and belongs to the technical field of a fiber laser device. The cladding light stripper comprises a fiber which performs thermal stripping treatment on a coating and an outer cladding and is coated with a high-refractive index optical gel, and a heat dissipation device, wherein the head dissipation device is manufactured by processing a complete metal (preferably, a high heat conductive metal) and comprises a base and a semicircular column protruding out of the base; the semicircular column has a cross section in the shape of the Greek alphabet Omega; the top portions of the two ends of the semicircular column are provided with two fine grooves; and thermistors are respectively fixed inside the heat dissipation device through the two fine grooves. The fiber cladding light stripper for the high-power fiber laser is simple and small, and can effectively transfer the heat converted by cladding light.

Description

technical field [0001] The invention relates to an optical fiber cladding optical stripper for high-power optical fiber lasers, belonging to the technical field of optical fiber laser devices. Background technique [0002] In recent years, with the gradual maturity of high-power semiconductor laser pumping technology and double-clad fiber drawing technology, fiber lasers have transformed from spatially discrete structures to all-fiber structures, and the output power has continued to increase. At present, the maximum single-mode output power has exceeded one Tens of thousands of watts, multi-mode output power reaches tens of thousands of watts. [0003] In addition to the residual pump light in the inner cladding of the fiber at the end of the double-clad fiber laser system, there is also a part of spontaneous emission light (ASE) and signal light leaked from the core into the inner cladding at the fusion point. If the light is not stripped but directly output, it will affe...

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Problems solved by technology

However, the above three methods all strip off most of the cladding light within a very short length of the fiber. After the cladding light is converted into heat, it will cause the local temperature of the fiber to be too high. In severe cases, it will cause the stripper to burn out, or even burn out due to the self-focusing effect. Burn the entire laser system forward

A device that seals an optical fiber that can strip the cladding light in a metal container with a water inlet and a water outlet, and passes the cooling water to the container. Although it can have a heat dissipation effect, it needs to consider various aspects such as sealing. The production process is relatively complicated, and soaking the optical fiber in cooling water for a long time will accelerate the aging of the optical fiber (see the patent publication No. CN102255227A published on April 29, 2011, "Optical Fiber Cladding Optical Filter and Its Manufacturing Method")

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