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Proceedings Paper

Hollow-core fiber based linear cavity ring-down spectroscopy for gaseous oxygen detection
Author(s): Dorit Munzke; Michael Böhm; Oliver Reich
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Paper Abstract

We present a spectroscopic technique that combines the benefits of cavity ring-down spectroscopy and a hollowcore photonic crystal fiber. The 10m fiber is placed inside an optical cavity and acts both as the sample cell (volume = 442 nL) and as a waveguide. Due to the high reflectivity of the cavity mirrors and rather small coupling losses, the effective optical path length can be increased up to 70m. Therefore, as a figure of merit the volume per optical interaction path length is calculated to 6.3 nL m−1. Oxygen detection is performed at 760 nm while scanning across an absorption line. The optical loss due to sample absorption is determined by measuring the ring-down time of light traveling inside the cavity. Results are compared to HITRAN database showing a discrepancy of only 2.5% of the absorption coefficient. This method is of interest for applications that require sensitive measurements on sample volumes of few nanoliters to microliters without the need of calibration.

Paper Details

Date Published: 2 June 2014
PDF: 4 pages
Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915789 (2 June 2014); doi: 10.1117/12.2059485
Show Author Affiliations
Dorit Munzke, Univ. of Potsdam (Germany)
Michael Böhm, Univ. of Potsdam (Germany)
Oliver Reich, Univ. of Potsdam (Germany)


Published in SPIE Proceedings Vol. 9157:
23rd International Conference on Optical Fibre Sensors
José M. López-Higuera; Julian D. C. Jones; Manuel López-Amo; José Luis Santos, Editor(s)

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