Near Infrared Absorption Detection in Picolitre Liquid Volumes Using Fiber Loop Ring-Down Detection
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Authors
Andrews, Nicholas L. P.
Litman, Jessica
Stroh, Daniel
Barnes, Jack A.
Loock, Hans-Peter
Date
2016-03-07
Type
journal article
Language
en
Keyword
Cavity Ring-Down , Absorption Spectroscopy , Fiber (fibre) Loop , Acetylene Gas Detection
Alternative Title
Abstract
Cavity ring-down spectroscopy is performed using a single-mode fibre loop as an optical cavity. The loop contains absorption cells for either liquids or gases, as well as an erbium-doped fibre amplifier. The fibre amplifier is gain-clamped using a second fibre-loop. Ring-down times can be tuned to permit several hundred roundtrips by adjusting the loss ratio between the two nested loops using a variable optical attenuator. Ring-down measurements were performed either in the time domain or using phase shift measurements.
Acetylene gas was detected through a ro-vibrational absorption line of the ν1–ν3 combination band at 1532 nm at a limit of detection of 50 ppm. Liquid 1-octyne and 1-dodecyne were detected in a 1 pL volume at detection limits of ∼20% dilution in dodecane through their C–H stretch vibrational overtone transition.
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PubMed ID
External DOI
ISSN
10.1016/j.yofte.2013.07.012
1095-9912
1095-9912