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Updated: Jul 9, 2026

09:38
Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
Photoacoustic monitoring of trace gases by use of a diode-based difference frequency laser source
Optics Letters
|December 1, 2007
Abstract:
We present a compact mid-infrared laser spectrometer for trace-gas monitoring. Difference frequency generation in periodically poled LiNbO(3) is used as laser source, yielding a tuning range 3.2-3.7mum 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 10(6) by volume concentration range.
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