Narrow-linewidth all-fiber cascaded 4.66 μm fiber gas laser with oscillator structure

Abstract

The invention provides a narrow line width all-fiber cascaded 4.66 μm fiber gas laser with an oscillator structure. It includes a pump source, an input solid-core fiber, a first gas cavity, an anti-resonance hollow-core fiber, a second gas cavity and an output solid-core fiber. Write the first input fiber Bragg grating and the second input fiber Bragg grating on the input solid-core fiber, write the first output fiber Bragg grating and the second output fiber Bragg grating on the output solid-core fiber, and two pairs of fiber Bragg gratings constitute an oscillator structure. Fill the anti-resonance hollow core fiber with appropriate pressure of CO and buffer gas. The 1.5μm-band pump laser interacts with the CO gas filled in the core of the anti-resonant hollow-core fiber. Under the oscillator structure, the 4.66μm laser output is generated through two cascaded stimulated emission transitions. The invention adopts an all-fiber structure to realize 4.66 μm fiber laser output, and simultaneously simplifies the structure, reduces the volume of the laser, and makes the laser more convenient.

Description

technical field [0001] The invention belongs to the field of fiber laser technology, and in particular relates to a mid-infrared narrow-linewidth fiber gas laser with an oscillator structure. Background technique [0002] The mid-infrared laser in the 3-5μm band is located in the transmission window of the atmosphere. It can be used in communications, biomedicine, and environmental monitoring in the civilian field, and it can be used in photoelectric countermeasures and missile tail flame detection in the military. It has attracted widespread attention from scientists. [0003] At present, the means of generating mid-infrared lasers mainly include quantum cascade lasers, solid-state lasers, gas lasers, optical parametric amplifiers, and fiber lasers. Quantum cascade lasers have a wide output bandwidth and can be miniaturized, but they require high processing levels, large current thresholds, poor beam quality, and usually need to work at low temperatures. Solid-state lasers...

AI Technical Summary

Problems solved by technology

However, traditional gas lasers are bulky and inconvenient to carry, which is not conducive to practical applications

In addition, the existing fiber gas lasers based on hollow-core fibers are all spatial structures, and have not been fully fiber-optic.

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