Trident tree-shaped photon lantern and preparation method thereof

Abstract

The invention provides a trident tree-shaped photon lantern and a preparation method thereof, comprising N 3×1 sub-photon lanterns, N 3×1 sub-photon lanterns are distributed in a tree structure to form a multi-layer photon lantern structure, and the upper layer of photon lanterns The output fiber of each 3×1 sub-photon lantern in the structure is used as the input fiber of the 3×1 sub-photon lantern in the next layer of photon lantern structure, and each 3×1 sub-photon lantern is composed of three input optical fibers and then tapered and cut with The output fiber splicing is formed. The present invention can manufacture multi-stage multi-aperture trident tree-shaped photonic lanterns according to any output fiber size, and provides the possibility to realize fiber laser output with higher power, larger mode field and higher beam quality, in laser cutting, optical fiber communication And the field of high-energy laser has broad application prospects.

Description

Technical field [0001] The present invention belongs to the field of laser, and more particularly to a trigemine photon lantern and a preparation method thereof in low loss high mode coupling efficiency. Background technique [0002] Excellent power amplification capabilities, excellent thermal management capabilities, and features that are easy to integrate into the modular system, making it a research hotspot in the laser field. However, the output power of the single fiber laser laser is extremely limited by nonlinear effect limits. In order to mitigate the influence of nonlinear effects, the research and development of large-scale field fiber (LMA) is widely concerned by researchers. However, with the increase in the diameter of the LMA fiber, the problem of thermal mode instability (TMI) gradually highlights: as the output power is increased, the steady-state substantimeter output becomes an amaten state high-order mode output. Mode mutation. [0003] The spatial mode adapti...

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Problems solved by technology

[0004] Aiming at the problem that the traditional mode control system based on photonic lanterns can only realize the first-level link from single-mode fiber to multi-mode fiber, and there is a problem of efficiency limit when realizing large mode field, high power and high beam quality fundamental mode output, the present invention A three-point tree-shaped photon lantern and its preparation method are proposed, which can produce multi-level multi-aperture three-point tree-shaped photon lanterns according to any output fiber size, in order to achieve higher power, larger mode field, and higher beam quality. The output of fiber laser is possible, and it has broad application prospects in the fields of laser cutting, optical fiber communication and high-energy laser

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