| Citation: | PAN Qi-kun, MIAO Fang-chen, SI Hong-Li, SHEN Hui, GAO Fei, YU De-Yang, ZHANG Kuo, ZHANG Ran-ran, ZHAO Chong-Xiao, CHEN Fei, GUO Jin. Compact pulsed CO2 laser with wavelength automatic tuning[J]. Chinese Optics, 2022, 15(5): 1007-1012. doi: 10.37188/CO.2022-0107
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In order to meet the application requirements of airborne laser differential absorption lidar for small and lightweight light sources, a compact pulsed CO2 laser is developed with automatic wavelength tuning. First, the aperture matching relationship between an RF waveguide intracavity beam and a free space optical chopper beam was studied, and a beam conversion system was designed with real focus on the intracavity. The influence of the chopper aperture on a laser pulse waveform was verified experimentally. Secondly, the wavelength tuning characteristics of CO2 laser were studied, and the diffraction angle difference between adjacent laser spectral lines was analyzed. Tunable operation in the CO2 laser was realized using a high-precision electric turntable and metal blazed grating. Finally, the integration of a compact automatic tuning pulsed CO2 laser was completed using small lightweight modules. Experimental results indicate that the laser operates stably at 1 kHz with a pulse width of 350 ns and a peak power of 3.7 kW. There are 30 lines within 9.2~10.7 μm waveband. The total weight of the laser is 18 kg. It provides a miniaturized detection light source for airborne laser differential absorption lidar.
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