Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry instrumentation for Doppler-broadened detection in the 10-12 cm-1 Hz-1/2 region

Ehlers, Patrick,1981-Umeå universitet,Institutionen för fysik,Laser physics group (author)

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 x 10(-12) cm(-1) 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 x 10(-12) cm(-1) and a relative single-pass absorption (Delta I/I) of 7.2 x 10(-11). The system was applied to detection of acetylene on a transition at 1531.588 nm, yielding a detection sensitivity of C2H2 in atmospheric pressure gas of 4 ppt (measured over 10 s). (C) 2012 Optical Society of America

Silander, Isak,1980-Umeå universitet,Institutionen för fysik(Swepub:umu)issi0002 (author)
Wang, JunyangUmeå universitet,Institutionen för fysik(Swepub:umu)juwa0004 (author)
Axner, Ove,1957-Umeå universitet,Institutionen för fysik(Swepub:umu)ovax0001 (author)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

In:Journal of the Optical Society of America. B, Optical physics: Optical Society of America29:6, s. 1305-13150740-32241520-8540

By the author/editor: Ehlers, Patrick, ...; Silander, Isak, ...; Wang, Junyang; Axner, Ove, 1957 ...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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