High-power double-clad optical fiber cladding light stripper device and manufacturing method

Abstract

The invention provides a high-power double-clad optical fiber cladding light stripper device and a manufacturing method. The light stripper device comprises double-clad optical fibers (116), an optical module (111), a fixing material (113) and water-cooled tubes (117 and 118). The double-clad optical fibers (116) penetrate through the optical module (111) and the fixing material (113). The optical module (111) is arranged in the fixing material (113). The water-cooled tube (117) is installed on the lower portion of the fixing material (113). The optical module (111) is of a three-layer waveguide structure. A heat dissipating material is adopted as the fixing material (113). According to the device, double-clad optical fiber inner cladding is corroded to form an opposite conical structure, and placed into the waveguide structure manufactured with semi-hollow cylinders and semi-solid cylinders made of a transparent material so as to leak light, the light leaked by the inner cladding is leaked uniformly in the length direction of the optical fibers, power density of the light and heat is reduced, and the situation that because light leakage is excessively concentrated, optical gel is burned out can be avoided.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a high-power double-clad optical fiber cladding optical stripper device and a manufacturing method. Background technique [0002] Traditionally, with the development of high-power semiconductor laser technology and the invention of double-clad doped optical fibers, the output power level of fiber lasers has been greatly improved. So far, high-power fiber lasers have been widely used in laser weapons, laser cutting, laser welding, laser processing and other fields. Fiber cladding optical stripper is one of the key components of high-power fiber lasers. It is used to strip the cladding residual pump light in the double-clad fiber and the cladding transmission signal caused by the unsatisfactory fiber fusion effect and mismatching fusion mode. Its performance has an important impact on the output beam quality and system stability of high-power fiber lasers. [0003] There ...

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Problems solved by technology

[0003] There are many documents and patents describing the devices and methods for removing optical fiber cladding light. The simplest method is to directly remove the low refractive index coating layer of the optical fiber, and then coat the removed coating layer with a high refractive index material. Cover curing, this method is difficult to remove low numerical aperture light, and the stripping efficiency is low, and the light leakage points are too concentrated to easily cause the stripper to burn

In order to overcome the shortcomings of this method, the document "Anovelmethodforstrippingcladdinglightsinhighpowerfiberlasersandamplifiers" J.LightwaveTechnol.vol.30pp.3199-3202 uses hydrofluoric acid vapor to corrode the double-clad optical fiber into a fiber cone, and then coats the fiber cone with high-refractive glue. Cladding power stripping, this method can not only solve the problem of too concentrated light leakage but also remove the cladding light with low numerical aperture, but this method has the following problems: First, the stripped light is converted into heat and concentrated in high refraction glue, and high-refractive glue is generally difficult to withstand high power; second, the method of corroding with hydrofluoric acid vapor is relatively complicated, and the consistency of corroded optical fibers cannot be guaranteed, making it difficult to mass-produce

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