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Two-tone frequency-modulation spectroscopy

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Abstract

A new method for performing high-frequency, visible FM spectroscopy by using low-frequency detection is demonstrated. By using this technique, a detection limit of 323 μTorr m (path length) has been established for atmospheric-pressure-broadened NO2. This corresponds to a differential absorption of 1.0 × 10−5.

© 1986 Optical Society of America

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