Abstract

A cw difference-frequency spectrometer has been developed for the 2.2 to 4.2 µm infrared region by mixing argon and tunable dye lasers in LiNbO3. A resolution of 5 × 10-4 cm-1 with continuous scans up to 1 cm-1 and a scan precision better than 2 × 10-3 cm-1 have been achieved. Tunable ir powers of ˜ 1 µW have been obtained, enabling sensitive absorption measurements and real-time spectroscopy. The range, resolution, speed, and sensitivity of this difference-frequency technique are demonstrated by absorption traces of water vapor, ammonia, methane, and nitrous oxide.

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