Intermediate infrared gas laser of multi-wavelength overtone cascade time sequence laser pump

Abstract

The invention belongs to the technical field of lasers and particularly relates to an intermediate infrared gas laser of a multi-wavelength overtone cascade time sequence laser pump. The intermediate infrared gas laser comprises a pump source, a pattern matching lens, a gas chamber and a resonant cavity. The gas chamber is filled with gain medium gas. The resonant cavity comprises a laser cavity mirror which is composed of an input mirror and an output mirror. The wavelength of multi-wavelength time sequence pump pulses generated by the pump source is aligned with the overtone cascade absorption spectrum line of gain medium gas molecules. Pulse time sequence corresponds to the sequence of a cascade pump, and the pulses are injected into the resonant cavity through the pattern matching lens. The gain medium gas molecules are pumped into a highly excited level in a cascade mode through pumping pulses. The gain medium gas molecules transit to a lower energy level through spontaneous radiation cascade, the spontaneous radiation forms stimulated radiation through positive feedback provided by the resonant cavity to generate laser oscillation, and intermediate infrared light is output from the output mirror of the resonant cavity. According to the intermediate infrared gas laser, the saturated absorption effect is weakened through the cascade effect, absorption of pump energy is enhanced, and pumping efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a mid-infrared gas laser pumped by multi-wavelength pan-frequency cascaded sequential lasers. Background technique [0002] Laser-pumped gaseous molecular lasers can obtain rich wavelengths and high average power output in the mid-to-far infrared band. At present, compact mid-infrared light sources are relatively scarce; solid-state and fiber lasers are difficult to achieve mid-infrared output above 3um; although OPO (Optical Parametric Oscillator) technology can be used to achieve mid-infrared output, it is limited by the thermal effect of nonlinear crystals. power development. As the output wavelength of solid-state lasers can reach the pan-frequency absorption band of gas molecules, optically pumped mid-infrared gas lasers can combine the advantages of compact structure and high efficiency of solid-state lasers and the advantages of easy flow and heat dissipation o...

AI Technical Summary

Problems solved by technology

The main characteristics of different pumping methods are: (1) First-order over-frequency pumping: the pumping wavelength is longer and the absorption cross-section is larger, which is conducive to pump absorption, but only one band of fundamental frequency transition can be obtained, and the quantum efficiency is relatively low. Low; (2) High-order overtone pumping: the pump wavelength is shorter, so the absorption cross section is smaller, and the pump absorption is weaker, but it is easy to form cascade transitions between multiple bands, with high quantum efficiency

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