28 October 2010 Development of coherent 2-μm differential absorption and wind lidar with laser frequency offset locking technique
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Abstract
We developed a coherent 2-μm differential absorption and wind lidar to measure CO2 concentration and line-of-sight wind speed. The wavelength of on-line laser was set at the R30 absorption line center of CO2 and the atmospheric transmission for the on-line backscattered signal caused by CO2 is large. Measurable range of CO2 measurement was limited. A laser frequency offset locking system was installed into the laser system to improved measurable range of CO2 measurement. Two single-frequency continuous wave lasers are used for the laser frequency offset locking. One laser (center, λCenter) of the two continuous lasers is directly locked to the R30 absorption line center of CO2 and the other (on-line, λOn) is frequency-shifted to λCenter laser. Although long-range CO2 measurement depends on the laser frequency offset, the installation of the laser frequency offset realized vertical CO2 measurement in a range of up to the upper troposphere.
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S. Ishii, S. Ishii, K. Mizutani, K. Mizutani, H. Fukuoka, H. Fukuoka, T. Ishikawa, T. Ishikawa, P. Baron, P. Baron, H. Iwai, H. Iwai, T. Aoki, T. Aoki, T. Itabe, T. Itabe, A. Sato, A. Sato, K. Asai, K. Asai, } "Development of coherent 2-μm differential absorption and wind lidar with laser frequency offset locking technique", Proc. SPIE 7860, Lidar Remote Sensing for Environmental Monitoring XI, 786004 (28 October 2010); doi: 10.1117/12.871327; https://doi.org/10.1117/12.871327
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