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Proceedings Paper

Development of a compact light source at 1.67 um for methane leak detection using DIAL
Author(s): Nilesh J. Vasa; Kouji Saito; Kouki Ikuta; Yuji Oki; Mitsuo Maeda
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Paper Abstract

In the present work, a sensing system for methane gas leakage monitoring based on a differential absorption lidar with a high temporal resolution is proposed and a spectrally narrowed light source at 1.67 ?m is developed for the same. To realize a compact light source, an injection seeded optical parametric oscillator (OPO) combined with two-stage optical parametric amplifiers (OPAs) is considered. Both OPO and OPAs were pumped by a compact frequency doubled Nd:YAG laser, and a single—mode diode laser (781.6 nm) was employed for injection seeding of the OPO. The output energy of around 5 mJ corresponding to a pump input of 85 mJ was obtained using Ce doped KTP (Ce:KTiOPO4) crystals. The spectral width of the source was measured as 0.5 cm-1 with a beam divergence angle of less than 2 mrad. These output characteristics are satisfactorily meeting the requirements to detect the methane leakage in a short range.

Paper Details

Date Published: 13 February 2001
PDF: 9 pages
Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); doi: 10.1117/12.417081
Show Author Affiliations
Nilesh J. Vasa, Kyushu Univ. (Japan)
Kouji Saito, Kyushu Univ. (Japan)
Kouki Ikuta, Kyushu Univ. (Japan)
Yuji Oki, Kyushu Univ. (Japan)
Mitsuo Maeda, Kyushu Univ. (Japan)

Published in SPIE Proceedings Vol. 4153:
Lidar Remote Sensing for Industry and Environment Monitoring
Upendra N. Singh; Upendra N. Singh; Kazuhiro Asai; Toshikasu Itabe; Toshihiro Ogawa; Nobuo Sugimoto, Editor(s)

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