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

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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 μm 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.

Original languageEnglish
Pages (from-to)471-479
Number of pages9
JournalProceedings of SPIE-The International Society for Optical Engineering
Publication statusPublished - 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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