Variable line selection stable resonant cavity suitable for air flow chemical laser

Abstract

The invention relates to a variable line selection stable resonant cavity suitable for an air flow chemical laser. A stable cavity structure is adopted for the device. A plano-concave reflector, a Brewster plate, a gain media, a Brewster plate, a diaphragm and a plane diffraction grating are successively arranged along an output dimension of laser. An off-axis parabolic reflector, a shutter system and a planar reflector are successively arranged in a first-order diffraction optical path. According to the variable line selection stable resonant cavity, a fixed diffraction grating is used for the laser device. The diffraction grating is used for realizing different diffraction angles of laser with different wavelengths. Through controlling and selection of the shutter system to branch lines with different wavelengths, outputting of air flow chemical laser in a selected line is realized. The variable line selection stable resonant cavity of the invention has advantages of: compact structure, high optical beam quality, high stability, quick line selection and outputting of the laser, etc. The variable line selection stable resonant cavity can be widely applied for the fields of laser material processing, environment monitoring, etc.

Description

technical field [0001] The invention belongs to the field of chemical laser devices, and in particular relates to a line-selectable stable resonant cavity suitable for gas flow chemical lasers. Background technique [0002] Pneumatic chemical lasers work in the wide infrared spectrum range of 1-12 μm, and have the advantages of high power, high efficiency, and good atmospheric transmission window, etc., and are widely used in laser physics, laser medical treatment, laser countermeasures and other fields. At present, most gas flow chemical lasers such as HF / DF lasers, HBr lasers, CO 2 Lasers, etc. are multi-spectral output, but in actual work, lasers are often required to operate at certain specific wavelengths and single-spectrum lines. In this case, line selection lasers become very important. [0003] At present, the methods for realizing the line selection output of gas flow chemical laser mainly include: line selection by adjusting the mixed air flow parameters, line se...

AI Technical Summary

Problems solved by technology

At present, there are mainly two methods for realizing grating line selection output: rotating grating and scanning grating. These two methods have repeat positioning accuracy problems due to the mechanical structure of installing the grating and scanning components, and some specific occasions require fast selection of spectral lines of different wavelengths. Line output, which makes the stability of lasers that use this method to achieve line selection output cannot be guaranteed

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