Small core radial bundling type large effective module field area and high non-linear photon crystal optical fiber

Abstract

The invention discloses a small-core cluster photonic crystal fiber with a large effective mode field area and high non-linearity, which pertains to the technical field of fibers. The effective mode field area of the photonic crystal fiber is composed of the bunching of a plurality of fibers with a core diameter of 1 to 2 microns; small air vent holes are arranged around each small fiber core to form a covering; the periphery of a small bunching core is the structure of a multi-layer air vent hole covering. The photonic crystal fiber has the advantages that the photonic crystal fiber retains and promotes the original feature of high non-linearity, has relatively large effective mode field area and can bear relatively large pump energy; when the photonic crystal fiber is combined with a photonic crystal fiber mode lock laser with high power, a small-sized super-continuum laser source with high power is formed.

Description

technical field [0001] The invention relates to a small core-diameter bundled type large effective mode field area and high nonlinear photonic crystal optical fiber, which belongs to the technical field of optical fibers. Background technique [0002] The supercontinuum laser source (white light laser) is a laser source with a wide spectral distribution, and the resulting spectral resolution technology has been widely used in optical communication, life science, military and other fields [1] . In 1996, the Russell group of the University of Bath successfully developed the world's first photonic crystal fiber with a periodic microstructure, thus realizing the human dream of photonic crystals at the two-dimensional level. [2] . In 1999, several laboratories and companies in the United Kingdom, the United States, and Denmark successively developed a variety of photonic crystal fibers with different structures using traditional fiber drawing technology, and began to provide a ...

AI Technical Summary

Problems solved by technology

However, there are obvious disadvantages of using small-diameter photonic crystal fibers to produce supercontinuum. The effective area of ​​the core diameter is only a few square microns. When the focused high-power pump exceeds the damage threshold of the material, the fiber end face is destroyed, that is Traditional highly nonlinear photonic crystal fibers cannot withstand high incident power, resulting in generally low output power of supercontinuum laser sources

This leads to a pair of contradictions, that is, the frequency conversion efficiency is inversely proportional to the core diameter of the fiber, and a large fiber core diameter is required to withstand high incident power

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