Hollow-solid composite multi-core photonic crystal fiber and its laser amplification method

Abstract

The invention discloses a hollow-solid composite multi-core photonic crystal fiber and a laser amplifying method thereof. The fiber comprises a protection layer, a covering layer and a fiber core successively from exterior to interior. The fiber core comprises a solid gain fiber core and a hollow fiber core. The covering layer and the hollow fiber core form a structure which is the same as a hollow photonic crystal fiber. According to the invention, by combining the hollow photonic crystal fiber and a multi-core photonic crystal fiber, and combining the high damage threshold of the hollow photonic crystal fiber and the nonlinear beam combination of the multi-core photonic crystal fiber, advantages of them are completely kept; use restriction of them is overcome; laser energy will not be restrained by the damage threshold of the multi-layered photonic crystal fiber; and the single-module laser pulse peak power is amplified and output to the GW level or the average power is amplified and output to the 100kW level.

Description

technical field [0001] The invention relates to the technical field of high-power fiber lasers, in particular to a hollow-solid composite multi-core photonic crystal fiber and a laser amplification method thereof. Background technique [0002] In 1961, E.Snitzer and others proposed the concept of fiber laser, and in 1966, Gao Kun and others pointed out the direction for the development of extremely low loss optical fiber. Since then, fiber laser has been widely used in various fields due to its unique advantages such as high reliability, high compactness, high energy efficiency and maintenance-free. In 1988, E. Snitzer and others proposed the concept of double-clad fiber, which significantly increased the pump power that the fiber could absorb and coupled, and provided the possibility for high-power laser amplification. The emergence of single-mode or few-mode large-mode-field optical fibers in the late 1990s increased the nonlinear threshold and damage threshold of optical...

AI Technical Summary

Problems solved by technology

[0006] The high threshold characteristic of the hollow-core photonic crystal fiber benefits from the extremely small power ratio in the quartz glass, but at the same time, it also causes the laser mode field and the doped medium to not overlap effectively, making it difficult for the signal laser to be amplified

Therefore, the hollow-core photonic crystal fiber can only be used as a transmission medium at present, and cannot amplify the laser pulse energy, and the transmitted high peak power laser needs to be generated by other types of lasers

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