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 journalArticle

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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