title: 10 kHz detection of CO2 at 4.5 microm by using tunable diode-laser-based difference-frequency generation.
abstract: A compact, high-speed tunable, diode-laser-based mid-infrared (MIR) laser source has been developed for absorption spectroscopy of CO2 at rates up to 10 kHz. Radiation at 4.5 microm with a mode-hop-free tuning range of 80 GHz is generated by difference-frequency mixing the 860 nm output of a distributed-feedback diode laser with the 1064 nm output of a diode-pumped Nd:YAG laser in a periodically poled lithium niobate crystal. MIR absorption spectroscopy of CO2 with a detection limit of 44 ppm m at 10 kHz is demonstrated in a C2H4-air laminar diffusion flame and in the exhaust of a liquid-fueled model gas-turbine combustor.
authors.affiliation: Innovative Scientific Solutions Inc, Dayton, Ohio 45440, USA. trmeyer@innssi.com
authors.forename: Terrence R
authors.initials: TR
authors.lastname: Meyer
authors.forename: Sukesh
authors.initials: S
authors.lastname: Roy
authors.forename: Thomas N
authors.initials: TN
authors.lastname: Anderson
authors.forename: Robert P
authors.initials: RP
authors.lastname: Lucht
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Barron-Jimenez
authors.forename: James R
authors.initials: JR
authors.lastname: Gord