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 10kHz. Radiation at 4.5μm with a mode-hop-free tuning range of 80GHz is generated by difference-frequency mixing the 860nm output of a distributed-feedback diode laser with the 1064nm 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 44ppmm at 10kHz is demonstrated in a C2H4–air laminar diffusion flame and in the exhaust of a liquid-fueled model gas-turbine combustor.

© 2005 Optical Society of America

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