2 June 2014 Hollow-core fiber based linear cavity ring-down spectroscopy for gaseous oxygen detection
Author Affiliations +
Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 915789 (2014) https://doi.org/10.1117/12.2059485
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain
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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dorit Munzke, Dorit Munzke, Michael Böhm, Michael Böhm, Oliver Reich, Oliver Reich, } "Hollow-core fiber based linear cavity ring-down spectroscopy for gaseous oxygen detection", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915789 (2 June 2014); doi: 10.1117/12.2059485; https://doi.org/10.1117/12.2059485
PROCEEDINGS
4 PAGES


SHARE
Back to Top