Abstract

To reduce the complexity of fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry, a system incorporating a fiber-coupled optical circulator to deflect the cavity-reflected light for laser stabilization has been realized. Detection near the shot-noise limit has been demonstrated for both Doppler-broadened and sub-Doppler signals, yielding a lowest detectable absorption and optical phase shift of 2.2×1012cm1 and 4.0×1012cm1, respectively, both for a 10 s integration time, where the former corresponds to a detection limit of C2H2 of 5 ppt.

© 2014 Optical Society of America

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