Novel taper-free pumped optical fiber combiner structure

Abstract

The invention relates to a novel taper-free pumped optical fiber combiner structure. The pumped optical fiber combiner is formed by combining at least one pumped fiber, a beam combining and coupling device, a device used for packaging and fixing the combiner and a device used for outputting. The beam combining and coupling device is prepared by a quartz material with a special shape, and comprisestwo parts, namely a convex mirror and a conical cylinder, wherein a high-reflectivity thin film for the pumping wavelength is plated on the side face of the conical cylinder, and the beam combining efficiency can be guaranteed. By the adoption of the pumped optical fiber combiner structure prepared by the novel structure, the mechanical instability caused by the optical fiber taper under a conventional pumped beam combining method can be effectively avoided, the structure can be used for pumped beam combination of a high-power fiber laser, the pumping brightness is improved, and the structurehas relatively high manufacturability and is convenient to popularize.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to the structure of a pumping fiber beam combiner. Background technique [0002] In an all-fiber laser system, the pump light coupling technology is one of the key factors that determine the efficiency of the entire system. The key component of the coupling technology is the fiber combiner, and the manufacturing process level of the device is decisive for the coupling efficiency of the beam combiner. effect. The existing all-fiber combined beam technology is mainly divided into two types: end-pumped and side-pumped. The mainstream fiber combiner adopts the preparation process of melting and tapering multiple optical fibers (usually an odd number), and couples the pump power generated by multiple semiconductor lasers into a multimode optical fiber for output. This preparation method can obtain good coupling efficiency, but the fusion tapering process will put forward high requirements o...

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Problems solved by technology

This preparation method can obtain good coupling efficiency, but the fusion tapering process will put forward high requirements on the preparation process parameters, and the mechanical stability of the optical fiber after fusion tapering is poor, and it is easy to break, resulting in the finished product of the fiber combiner The efficiency is low, and there are still some difficulties in combining high-power optical fiber pump sources

Therefore, the present invention proposes a new type of pump fiber combiner structure without taper, which can effectively solve the problem of poor mechanical stability caused by fiber fusion and taper, and is suitable for pump combining of high-power fiber lasers, improving pump efficiency. It is of great significance to guide the production practice of large-scale and large-scale pump combiners

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