Fluorine-doped tapering sleeve and application thereof

Abstract

The invention discloses a fluorine-doped tapering sleeve and application. The tapering sleeve is a circular capillary tube and comprises a fluorine-doped quartz layer and a first pure silicon layer embedded in the fluorine-doped quartz layer, and step-type refractive index distribution of the fluorine-doped quartz layer is formed. The NA value of the fluorine-doped quartz layer ranges from 0.15 to0.23, and the ratio of the outer diameter to the inner diameter of the fluorine-doped quartz layer is larger than or equal to 1.1. The fluorine-doped tapering sleeve provided by the invention is applied to preparation of a beam combiner, can obviously tolerate high power, is long in service life, and can remarkably improve the transmission efficiency during laser beam combination.

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...

AI Technical Summary

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

Images