A PULSED-LASER SOURCE USING STIMULATED RAMAN-SCATTERING AND DIFFERENCE-FREQUENCY MIXING - REMOTE-SENSING OF METHANE IN AIR

Authors
LANCASTER DG DAWES JM
Citation
Dg. Lancaster et Jm. Dawes, A PULSED-LASER SOURCE USING STIMULATED RAMAN-SCATTERING AND DIFFERENCE-FREQUENCY MIXING - REMOTE-SENSING OF METHANE IN AIR, Optics communications, 120(5-6), 1995, pp. 307-310
Citations number
14
Categorie Soggetti
Optics
Journal title
Optics communications → ACNP
ISSN journal
00304018
Volume
120
Issue
5-6
Year of publication
1995
Pages
307 - 310
Database
ISI
SICI code
0030-4018(1995)120:5-6<307:APSUSR>2.0.ZU;2-I
Abstract
Mid-infrared radiation at 3.43 mu m is generated by difference frequen cy mixing a 1.064 mu m Nd:YAG laser with a methane gas Raman shifted N d:YAG (1.064 mu m) laser at 1.54 mu m in KTiOAsO4 (KTA). Using this pu lsed (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(-1)atm(-1). Additional source characteristics include an intrins ic wavelength stability defined by the methane Raman vibrational frequ ency and a moderate linewidth (similar to 1.5 cm(-1)).