A cladding power stripper for removing high-order mode laser and its manufacturing method

Abstract

The invention relates to a cladding power stripper for removing high-order mode lasers and a manufacturing method thereof. The structure of the cladding power stripper is that the optical fiber is coiled in the annular groove of the heat sink, and the annular water cooling channel is coiled in the annular groove of the heat sink. There are several heat sink grooves in the annular groove of the heat sink, and the surface of the optical fiber section suspended on the heat sink groove is etched into an irregular V-shaped groove shape, and the heat conduction medium is filled on the heat sink groove, and the heat conduction medium The etched optical fiber segment is completely covered and wrapped, and the housing cover plate is used to package and protect the heat sink. In the present invention, the double-clad optical fiber is stripped of the coating at intervals, and the exposed inner cladding is mechanically etched into irregular V-shaped grooves, which are used as outlets for cladding light; the leaked cladding power is absorbed by the heat-conducting medium, The heat is conducted to the heat sink and carried away by the cooling water. The invention increases the stripping efficiency of the high-order mode cladding light and improves the beam quality by bending the optical fiber into a ring shape.

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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