A fluorine-doped tapered sleeve and its application

Abstract

The invention discloses a fluorine-doped tapered bushing and its application. The tapered sleeve is a circular capillary, including a fluorine-doped quartz layer and a first pure silicon layer embedded in the fluorine-doped quartz layer, forming a step-type refractive index distribution of the fluorine-doped quartz layer; the fluorine-doped quartz layer , its NA value is between 0.15 and 0.23, and the ratio of its outer diameter to inner diameter is greater than or equal to 1.1. The fluorine-doped tapered sleeve provided by the invention is applied to the preparation of a beam combiner, which can significantly withstand high power, has a long service life, and can significantly improve the transmission efficiency during laser beam combining.

Description

technical field [0001] The invention belongs to the field of optical fiber laser, and more specifically relates to a fluorine-doped pull-taper sleeve and an application thereof. Background technique [0002] The high-power beam combiner is the core device in the high-power fiber laser, which can combine the energy of multiple low-power fiber lasers to form a higher-power laser for output. [0003] Fusing the beam combining taper is the most basic and critical step in the manufacturing process of the beam combiner. For different types of fiber combiners for different applications, there are different beam combining methods, and correspondingly different beam combining methods. cone method. At present, the mainstream methods of making beam combiners can be summarized into two types: twisting method and casing method. The casing method is to insert all the bare fiber areas and part of the coating area of ​​all input optical fibers into a quartz tube with an inner diameter sli...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a fluorine-doped tapered sleeve and its application, the purpose of which is to use the low refractive index fluorine-doped quartz layer and the pure fluorine-doped quartz layer embedded in the fluorine-doped quartz layer The silicon layer forms a fluorine-doped capillary with a multi-layer structure of low refractive index inside and high refractive index outside. It has good tapering performance and forms a low refractive index outer cladding, which is used to prepare beam combiners. The principle of internal reflection is used to improve The light beam ability of the beam combiner reduces the loss of the optical fiber energy transmission process, and the quartz material can withstand high-power lasers, thus solving the problem of using organic materials to form low-refractive index layers that are not resistant to high-power lasers or using The technical problem of low yield due to poor tapering performance of fluorine-doped quartz layer

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