Abstract

We present a compact mid-infrared laser spectrometer for trace-gas monitoring. Difference frequency generation in periodically poled LiNbO3 is used as laser source, yielding a tuning range 3.2–3.7 μm at a linewidth of 154  MHz. The relatively high average power of 3 to 5  mW favors detection with a small resonant photoacoustic gas cell. Measurements of methane yield a detection limit in the low parts in 106 by volume concentration range.

© 2001 Optical Society of America

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