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Proceedings Paper

A rapidly tunable TEA CO2 laser for differential absorption lidar
Author(s): Yanchen Qu; Deming Ren; Li-Li Zhang; Xiaoyong Hu; Fengmei Liu
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Paper Abstract

In the present work, directed toward using differential absorption lidar (DIAL) for measuring concentrations of pollutant gases, a galvanometer-driven mirror to scan a fixed diffractive grating for rapidly tuning a TEA CO2 laser is reported. It is well known that the ground- or air-basing DIAL is an effective tool for remote measurement of pollutant gaseous concentration of the atmosphere over large areas. It has, practically in real time, the ability to remotely detect various gas concentrations in the atmosphere, because many pollutant gases have strong absorption lines within the spectral range of CO2 laser wavelength tuning. In addition, the radiation of CO2 laser is safe for the human eye and is well distributed in the atmosphere, coinciding with the “transparency window” of the atmosphere. Therefore the wavelength tunable TEA CO2 laser is an ideal optical source for DIAL. The tuning is performed by generating and applying appropriate signals to the galvanometer, which rotated a silver mirror in order to scan the fixed grating. The device is driven by a programmable signal generator with resolution sufficient to rotate the mirror in discrete intervals as small as 70μrad, which is more than sufficient to find the optimum position for any lasing transition.

Paper Details

Date Published: 26 January 2005
PDF: 7 pages
Proc. SPIE 5627, High-Power Lasers and Applications III, (26 January 2005); doi: 10.1117/12.577257
Show Author Affiliations
Yanchen Qu, Harbin Institute of Technology (China)
Deming Ren, Harbin Institute of Technology (China)
Li-Li Zhang, Harbin Institute of Technology (China)
Xiaoyong Hu, Harbin Institute of Technology (China)
Fengmei Liu, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 5627:
High-Power Lasers and Applications III
Dianyuan Fan; Ken-ichi Ueda; Jongmin Lee, Editor(s)

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