Abstract
We present a compact mid-infrared laser spectrometer for trace-gas monitoring. Difference frequency generation in periodically poled is used as laser source, yielding a tuning range 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 by volume concentration range.
© 2001 Optical Society of America
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