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19 November 1999 Coherent emission sources tunable in a wide range for a CH4 lidar
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Proceedings Volume 3983, Sixth International Symposium on Atmospheric and Ocean Optics; (1999) https://doi.org/10.1117/12.370529
Event: Sixth International Symposium on Atmospheric and Ocean Optics, 1999, Tomsk, Russian Federation
Abstract
In this paper we present results obtained at the first stage of development of Small Mobile DAS Lidar to control leakage of methane and methane-bearing gas mixtures. We developed three models that operate at 0.25; 12.5, and 200 Hz pulse repetition frequency. All three are small Optical Parametric Oscillators (OPO) based on KTP crystals pumped with Nd:YAG (1.064 micrometers ) or Nd:YA (1.079 micrometers ) lasers. They span the 1.52 to 1.58 and 3.2 to 3.5 micrometers ranges and allow to work on both the most intense and weak CH4 absorption bands with the center at (lambda) equals 1.57 micrometers having the emission line width of 1 and 2.5 nm, respectively. The energies of single 5-ns emission pulses are equal to 4-5, 8- 10 and 15 mJ, respectively. It is enough for sensing up to 1 to 3-km distances with the sensitivity of 50 ppb/km. Second Harmonic Generation of OPO emission allows one to make measurements within 1.66 and 0.77 micrometers CH4 absorption bands.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yuri M. Andreev, Pavel P. Geiko, Mihail V. Alampiev, Efim M. Shvom, and Mikhail Yu. Kataev "Coherent emission sources tunable in a wide range for a CH4 lidar", Proc. SPIE 3983, Sixth International Symposium on Atmospheric and Ocean Optics, (19 November 1999); https://doi.org/10.1117/12.370529
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