A wavelength coated end cap assembly for suppressing stimulated Raman scattering and application thereof

Abstract

A wavelength-coated end cap set for suppressing stimulated Raman scattering comprises a first end cap and a second end cap, both end caps comprising an optical fiber and a quartz block; The quartz block is formed by connecting a circular table with the same end face size, a cylinder and an output curved surface in turn; One end face of the optical fiber is welded with the smaller end face of the circular table to form an interface; The extension line of the core line of the optical fiber is the center line of the circular table, the cylinder and the output curved surface; and the extension line of the core line of the optical fiber is the center line of the circular table and the output curved surface. The curved surface of the output curved surface is coated with film on the curved surface of the output curved surface with the intersection of the core extension line of the optical fiber and the interface as the spherical center and the sum of the lengths of the quartz block centerlinein the circular table, the cylinder and the output curved surface as the radius of curvature. The coating film on the surface of the first end cap is highly reflective at 900 nm to 1000 nm and 1060 to 1100 nm; and the coating film on the curved surface of the second end cap is lowly reflective on the 1060-1100 nm band, and fully transmissive on the other bands.

Description

Technical field [0001] The present invention generally relates to the field of fiber lasers, in particular to a wavelength coating end cap group for suppressing stimulated Raman scattering and its application. Background technique [0002] High-power fiber lasers have a wide range of applications in laser cutting, laser cladding, 3D printing and other fields. In recent years, with the increase in the power of double-clad fiber manufacturing technology and high-brightness semiconductor lasers, the output power of single-channel high-power fiber lasers has been rapidly developed, from 100 watts in the early 21st century to the current 10 kilowatts. With the continuous improvement of fiber laser output power, stimulated Raman scattering has become one of the main limiting factors limiting the output power of high-power fiber lasers. Traditional methods to suppress SRS include shortening the length of the gain fiber and increasing the area of ​​the mode field. Then, as the output p...

AI Technical Summary

Problems solved by technology

Therefore, there is currently no bidirectional fiber end cap capable of both feedback and suppression of stimulated Raman scattering effects

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