Development of a compact light source at 1.67 um for methane leak detection using DIAL

Nilesh J. Vasa; Kouji Saito; Kouki Ikuta; Yuji Oki; Mitsuo Maeda

doi:10.1117/12.417081

13 February 2001 Development of a compact light source at 1.67 μm for methane leak detection using DIAL

Nilesh J. Vasa, Kouji Saito, Kouki Ikuta, Yuji Oki, Mitsuo Maeda

Proceedings Volume 4153, Lidar Remote Sensing for Industry and Environment Monitoring; (2001) https://doi.org/10.1117/12.417081
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

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.

Citation Download Citation

Nilesh J. Vasa, Kouji Saito, Kouki Ikuta, Yuji Oki, and Mitsuo Maeda "Development of a compact light source at 1.67 μm for methane leak detection using DIAL", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); https://doi.org/10.1117/12.417081

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