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Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry for Doppler-broadened detection of C 2 H 2 in the parts per trillion range

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Abstract

A compact noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) spectrometer, based on a narrowband erbium-doped fiber laser and an integrated optics electro-optic modulator, has been developed for trace species detection. A general theoretical description of NICE-OHMS signals demodulated at an arbitrary FM detection phase is provided in terms of the analyte concentration. Explicit expressions for Doppler-broadened NICE-OHMS line shapes, which are in excellent agreement with the measurements, are given. In a first demonstration, using a cavity with a finesse of 1400, acetylene has been detected on a Doppler-broadened transition at 1531nm. A limit of detection of 130ppt, corresponding to an absorption of 2.4×109cm1, has been obtained.

© 2007 Optical Society of America

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