Mid-infrared gas cascaded Raman laser with all-fiber structure

Abstract

The invention discloses an all-fiber structured intermediate infrared gas cascade Raman laser. The all-fiber structured intermediate infrared gas cascade Raman laser comprises a near-infrared tunable fiber laser pumping source, an input solid core fiber, an anti-resonant hollow core fiber and an output solid core fiber which are welded sequentially; the anti-resonant hollow core fiber is filled with two kinds of Raman gain gases which make the pumping source go through generate excited Raman scattering to generate first-order Raman laser and make the first-order Raman laser go through excited Raman scattering to generate second-order Raman laser in an intermediate infrared band respectively; a first input Bragg grating which reflects the second-order Raman laser and a second input Bragg grating which reflects the first-order Raman laser are graved on the input solid core fiber; and a first output Bragg grating which reflects the first-order Raman laser and a second output Bragg grating which partially transmits the second-order Raman laser are graved on the output solid core fiber. The all-fiber structured intermediate infrared gas cascade Raman laser of the invention has the advantages of compact structure, stable performance, narrow linewidth, tunability, high efficiency, good beam quality and the like.

Description

Technical field [0001] The invention relates to the technical field of laser generating equipment, in particular to an all-fiber structure mid-infrared gas cascade Raman laser. Background technique [0002] The mid-infrared band is located in the atmospheric window and is widely used in remote sensing detection, lidar, communications, and military fields. At present, the lasers that realize output in the mid-infrared band mainly include quantum cascade lasers, electronic vibration solid-state lasers, optical parametric oscillators, and fiber lasers. Among them, the quantum cascade laser generates more heat during continuous operation, and its excited area is large, which makes it difficult to achieve high-power single-mode output; electronic vibration solid-state lasers can achieve high-efficiency output of 2-5μm, but the thermal lens effect limits it Increased power; the optical parametric oscillator can achieve tunable mid-infrared output with a power level of several watts, b...

AI Technical Summary

Problems solved by technology

However, when gas stimulated Raman scattering is realized in free space, the effective distance is limited by the Rayleigh length, the pumping threshold is high, and many competing Raman lines will be generated.

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