A pulsed laser source using stimulated Raman scattering and difference frequency mixing: remote sensing of methane in air

D. G. Lancaster*, J. M. Dawes

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Mid-infrared radiation at 3.43 μm is generated by difference frequency mixing a 1.064 μm Nd:YAG laser with a methane gas Raman shifted Nd:YAG (1.064 μm) laser at 1.54 μm in KTiOAsO4 (KTA). Using this pulsed (7 ns), moderate energy (1 mJ) source we demonstrate the optical detection of methane in air and measure an absorption coefficient of 1.2 cm-1atm-1. Additional source characteristics include an intrinsic wavelength stability defined by the methane Raman vibrational frequency and a moderate linewidth (∼1.5 cm-1).

    Original languageEnglish
    Pages (from-to)307-310
    Number of pages4
    JournalOptics Communications
    Volume120
    Issue number5-6
    DOIs
    Publication statusPublished - 1 Nov 1995

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