An all-fiber high-brightness single-mode fiber combiner and its manufacturing method

Abstract

The invention discloses an all-fiber high-brightness single-mode fiber beam combiner and a making method. The fiber beam combiner comprises a glass casing beam combination structure, a multi-core structure and a multi-mode fiber formed sequentially, wherein the glass casing beam combination structure comprises an original single-mode fiber, a glass casing with the same refractive index as a cladding and a glass casing with a low refractive index; the glass casing with the same refractive index as the cladding is located at the outer side of the original single-mode fiber, and the glass casing with the low refractive index is located at the outer side of the glass casing with the same refractive index as the cladding; the multi-core structure comprises a multi-core fiber and an outer cladding structure located at the outer side of the multi-core fiber; and the multi-mode fiber comprises a fiber core and a cladding located at the outer side of the fiber core. The method of the invention is used for making the above fiber beam combiner. Thus, the duty cycle of the fiber beam combiner can be effectively improved, and a high output laser beam quality can be obtained.

Description

technical field [0001] The invention mainly relates to the field of fiber lasers, in particular to an all-fiber high-brightness single-mode fiber combiner based on a low-refractive-index glass sleeve taper method. Background technique [0002] Fiber lasers have the advantages of high conversion efficiency, good beam quality, compact structure, easy heat dissipation, and good working stability, and have been widely used in industrial and national defense fields. However, due to the limitations of fiber nonlinear effects and optical thermal damage, the output power of a single fiber laser cannot be increased infinitely. In order to obtain greater fiber laser output, it is an effective means to combine multiple medium-power fiber lasers, and the key component required is the fiber combiner. Compared with the beam combining scheme of the spatial structure, the fiber combiner with the all-fiber structure has the advantages of simple and compact structure, flexible use, etc., and...

AI Technical Summary

Problems solved by technology

However, there are two defects in this method: one is that the quality of the optical fiber after chemical acid corrosion deteriorates, which is not convenient for post-processing; the other is that the distribution characteristics of the optical field of the fiber core determine that the cladding size cannot be reduced without limit

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