Optical-pumping intermediate infrared gas laser device

Abstract

The invention belongs to the technical field of laser devices, and discloses an optical-pumping intermediate infrared gas laser device. The laser device comprises a pumping source, gain media and a resonant cavity, wherein the pumping source comprises an optical seed source, a frequency stabilization device and optical cascade amplifiers; the gain media are HBr or mixed gas formed by other gas such as DF, HF, CO and CO2 and inert gas; the resonant cavity consists of a pumping input mirror and a laser output mirror; seed light can be split by the pumping source, and passes through the optical cascade amplifiers respectively, so that the pumping power is improved; 2-micrometer laser generated by the seed source can be aligned to absorption lines of the gain media, so that overtone pumping is achieved; an HBr gas molecule in an excited state generates fundamental frequency transition; and 4-micrometer intermediate infrared laser is outputted. The laser device is compact in structure, high in expansibility and easy in heat dissipation, and can achieve a high power output of the intermediate infrared laser.

Description

technical field [0001] The invention belongs to the technical field of lasers, and relates to a novel high-energy fiber-pumped mid-infrared gas laser using a fiber laser as a pumping source and gas as a gain medium. Background technique [0002] For a long time, the attenuation of laser absorption and scattering by the atmosphere is the key factor restricting the long-distance transmission of high-energy laser. The mid-infrared laser light source of 2-5 μm has attracted the attention of high-energy laser research institutions at home and abroad because its laser wavelength falls in the atmospheric window and can achieve long-distance transmission in the atmosphere. Pollution detection and other technical fields. At present, the laser light sources that can achieve mid-infrared laser output mainly include HF / DF chemical lasers, solid-state lasers, optical parametric oscillation lasers, and photonic crystal fiber lasers. Although chemical lasers can achieve high-power mid-in...

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Problems solved by technology

Although chemical lasers can achieve high-power mid-infrared laser output, their bulky practical applications are greatly limited; due to the inability to overcome the problem of beam quality deterioration caused by the thermal effect of solid gain media at high power, solid-state lasers are currently not An effective way to realize high-energy laser; although the optical parametric oscillator laser is a better way to realize the mid-infrared output, but because the optical parametric oscillator laser needs to realize the mid-infrared laser output through frequency doubling, sum frequency, difference frequency and other methods, the structure is complex, and Due to the limited thermal load capacity of the nonlinear crystal used in its core device, the development of optical parametric oscillator lasers to high-energy mid-infrared lasers is restricted; the hollow-core gas-filled photonic crystal fiber can also output mid-infrared laser, but due to the photonic crystal fiber The size is generally on the order of microns, the mode is very small, and it is difficult to achieve high-power laser output

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