Cladding power stripper for removing high-order mode laser and manufacturing method of cladding power stripper

Abstract

The present invention relates to a cladding power stripper for removing high-order mode laser and a manufacturing method of the cladding power stripper. The cladding power stripper is structured in the following manners that: an optical fiber is coiled in an annular groove of a heat sink; an annular water cooling channel is coiled in the annular groove of the heat sink; a plurality of heat sink recessed grooves are arranged in the annular groove of the heat sink; the surfaces of optical fiber segments suspended on the heat sink recessed grooves are etched so as to form irregular V-shaped groove structures; and the heat sink recessed grooves are filled with a heat-conducting medium; the heat conducting medium completely coats the etched optical fiber segments; and a shell cover plate enables encapsulation protection for the heat sink. According to the cladding power stripper of the present invention, the coating layer of the double-cladding optical fiber is stripped off at intervals, and an exposed inner cladding layer is mechanically etched into the irregular V-shaped grooves so as to be adopted as the dipping openings of cladding light; leaked cladding power is absorbed by the heat conducting medium; heat is transferred to the heat sink and then is taken away by cooling water; the optical fiber is bent into an annular shape, so that the stripping efficiency of high-order mode cladding light can be increased, and light beam quality can be improved.

Description

technical field [0001] The invention belongs to the field of high-power fiber lasers, and in particular relates to a cladding power stripper for removing high-order mode-stripping lasers and a manufacturing method. [0002] technical background [0003] Fiber lasers are widely used in metal cutting, welding, marking, material processing, and national defense security due to their characteristics of good beam quality, low power consumption, small size, and long life. In particular, the output power of high-power fiber lasers has been increasing year by year, and the maximum single-mode output has exceeded 10,000 watts. In high-power lasers and amplifiers, double-clad doped fibers are used as active fibers, and the pump light is coupled into the fiber core by cladding pumping. Due to the problem of absorption rate, there will always be some residual pump light in the cladding; at the same time, there is inevitably a fusion point in the fiber laser, and part of the core light w...

AI Technical Summary

Problems solved by technology

[0004] At present, the most commonly used method of stripping the cladding light is to coat the surface of the cladding with a high-refractive-index UV-curable glue. In high-power fiber lasers, the power of the cladding light is relatively large, and the glue has a strong polymer as a polymer. Light-absorbing properties will cause the temperature of the glue-coated area to be too high, resulting in a serious weakening of device performance

The other is to roughen the surface of the inner cladding by mechanical and chemical methods, so that the cladding light cannot meet the requirements of total reflection and leak out.

However, the above methods all have the problems of incomplete pump light stripping and insufficient high-order mode laser bleeding.

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