Three-branch tree-shaped photon lantern and production method thereof

Abstract

The invention provides a three-branch tree-shaped photon lantern and a production method thereof. The three-branch tree-shaped photon lantern comprises N 3*1 sub photon lanterns which are distributed in a tree-shaped structure to form a multi-layer photon lantern structure, the output optical fiber of each 3 * 1 sub photon lantern in the upper layer of photon lantern structure is used as the input optical fiber of each 3 * 1 sub photon lantern in the lower layer of photon lantern structure; and each 3 * 1 sub photon lantern is formed by combining, tapering and cutting three input optical fibers and then welding the three input optical fibers with the output optical fiber. The multi-stage multi-aperture three-branch tree-shaped photon lantern can be manufactured according to any output optical fiber size, a possibility is provided for further achieving optical fiber laser output with higher power, larger mode field and higher light beam quality, and the three-branch tree-shaped photon lantern has wide application prospects in the fields of laser cutting, optical fiber communication and a high-energy laser.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a triple tree-shaped photon lantern with low loss and high mode coupling efficiency and a preparation method thereof. Background technique [0002] Fiber lasers have gradually become a research hotspot in the laser field due to their excellent power amplification capabilities, excellent thermal management capabilities, and easy integration into modular systems. However, limited by nonlinear effects, there is a limit to the output power of a single fiber laser. In order to alleviate the influence of nonlinear effects, the research and development of large mode field fiber (LMA) has attracted extensive attention of researchers. However, with the increase of the mode field diameter of the LMA fiber, the problem of thermally induced mode instability (TMI) gradually becomes prominent, which is manifested as: as the output power increases, the steady-state fundamental mode ...

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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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