A new diode-laser-based UV-absorption sensor for high-speed detection of the hydroxyl radical (OH) is described. The sensor is based on sum-frequency generation of UV radiation at 313.5 nm by mixing the output of a 763-nm distributed-feedback diode laser with that of a 532-nm high-power, diode-pumped, frequency-doubled laser in a β-barium borate crystal. Approximately of UV radiation is generated and used to probe rotational transitions in the (, ) electronic transition of OH. Single-sweep, single-pass measurements of temperature and OH concentration in a stoichiometric –air flame are demonstrated at rates up to 20 kHz.
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