Abstract
A compact, high-speed tunable, diode-laser-based mid-infrared (MIR) laser source has been developed for absorption spectroscopy of at rates up to . Radiation at with a mode-hop-free tuning range of is generated by difference-frequency mixing the output of a distributed-feedback diode laser with the output of a diode-pumped Nd:YAG laser in a periodically poled lithium niobate crystal. MIR absorption spectroscopy of with a detection limit of at is demonstrated in a –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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