A fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry (FL-NICE-OHMS) system for white-noise-limited Doppler-broadened detection down to $5.6\times {10}^{-12}{\mathrm{cm}}^{-1}{\mathrm{Hz}}^{-1/2}$ is demonstrated. The system is based on a previous FL-NICE-OHMS instrumentation in which the locking of the laser frequency to a cavity mode has been improved by the use of an acousto-optic modulator (AOM) and provision of a more stable environment by the employment of a noise-isolating enclosed double-layer table, a temperature regulation of the laboratory, and an ultra-high-vacuum (UHV) gas system. White-noise behavior up to 10 s provides the instrument with a minimum detectable on-resonance absorbance per unit length of $1.8\times {10}^{-12}{\mathrm{cm}}^{-1}$ and a relative single-pass absorption ($\mathrm{\Delta }I/I$) of $7.2\times {10}^{-11}$. The system was applied to detection of acetylene on a transition at 1531.588 nm, yielding a detection sensitivity of ${\mathrm{C}}_2{\mathrm{H}}_2$ in atmospheric pressure gas of 4 ppt (measured over 10 s).

© 2012 Optical Society of America

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