21 March 2003 Monolithic microprocessor-controlled tuning and triggering system of TEA CO2 laser for differential absorption lidar
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Abstract
In the present work, directed toward using differential absorption lidar (DIAL) for measuring concentrations of pollutant gases, a monolithic microprocessor-controlled tuning and triggering system for rapidly tuning a TEA C02 laser is reported. It is shown that it is possible to utilize a high frequency stepping motor and a diffraction grating to rapidly select wavelength over rotational transitions in the 9.2-10.8 jtm region of the laser spectrum. The tuning is performed by applying appropriate signals to the stepping motor, which is coupled to the grating via a precision gear box. The microprocessor controls motion of the motor which rotates the correct angle for a given wavelength together with the grating. Many of pollutants have strong absorption lines in the 9-11 im region, therefore the wavelength tunable transversely excited atmospheric-pressure (TEA) CO2 laser becomes an ideal optical source for DIAL.
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Yanchen Qu, Deming Ren, Xiaoyong Hu, Fengmei M. Liu, Jinzhe Huang, Lili Zhang, Wenmei Song, "Monolithic microprocessor-controlled tuning and triggering system of TEA CO2 laser for differential absorption lidar", Proc. SPIE 4893, Lidar Remote Sensing for Industry and Environment Monitoring III, (21 March 2003); doi: 10.1117/12.466149; https://doi.org/10.1117/12.466149
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