A (n+1)×1 fiber end-pumped beam combiner based on fiber erosion

Abstract

The invention discloses an (N+1)*1 optical fiber end face pumping combiner based on optical fiber corrosion. The (N+1)*1 optical fiber end face pumping combiner comprises a signal input optical fiber, an output double-clad optical fiber and a plurality of pumping optical fibers. The tail end of the signal input optical fiber and the tail end of each pumping optical fiber are both circular truncated cones. The signal input optical fiber and the side faces of the tail ends of the pumping optical fibers are combined into an optical fiber bundle through flame sintering. The position, with the diameter equal to that of inner cladding of the output double-clad optical fiber, of the optical fiber bundle is cut flat in the radial direction. The optical fiber bundle is connected with the output double-clad optical fiber through end faces. The circular truncated cone is formed at the tail end of the signal input optical fiber in the mode that cladding is corroded by hydrofluoric acid. The circular truncated cone is formed at the tail end of each pumping optical fiber through tapering. The core of the signal input optical fiber is located in the center of the optical fiber bundle and is aligned with the core of the output double-clad optical fiber. According to the (N+1)*1 optical fiber end face pumping combiner based on optical fiber corrosion, design is flexible, any deformation of the core of the signal input optical fiber is not introduced, so that signal loss is not caused, and a higher signal optical power bearing capacity is achieved.

Description

technical field [0001] The invention relates to an optical fiber beam combiner, in particular to a (N+1)×1 optical fiber end face pumping beam combiner based on optical fiber corrosion, which belongs to the technical fields of optical fiber, optical communication and laser. Background technique [0002] In the past ten years, fiber lasers have made great progress in terms of performance indicators, and the laser application market has also continued to expand, especially in the field of industrial processing. Fiber lasers rely on high power, high energy, high beam quality and easy maintenance. , is gradually replacing traditional solid-state lasers and carbon dioxide lasers as the third-generation most advanced industrial processing lasers. With the demand for industrial processing, the market requires higher power and higher energy fiber lasers. [0003] High-power fiber lasers generally adopt the main oscillation power amplification technology, and use cascaded fiber ampl...

AI Technical Summary

Problems solved by technology

Regarding side pumping, some side pumping technologies will introduce space optics, which will cause heat generated by the pump light to affect thermal stability, and side pumping will increase the leakage of pump light

Regarding end-pumping, in existing patents, such as a (N+1)*1 fiber end-pumping beam combiner with patent number ZL200920132577.2, the ends of multiple pumping fibers are polygonally ground. Precision machining, and the polygonal design also increases the leakage of pump light to the outside, thus affecting the pump coupling efficiency

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