Lancaster, D G Methane detection with a narrow-band source at 3.4 µm based on a Nd:YAG pump laser and a combination of stimulated Raman scattering and difference frequency mixing. [electronic resource] - Applied optics Jul 1996 - 4041-5 p. digital Publication Type: Journal Article ISSN: 1559-128X Standard No.: 10.1364/AO.35.004041 doi