Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Laser development and applications IV
Q 23.5: Vortrag
Dienstag, 18. März 2014, 15:00–15:15, DO26 207
Cavity ring-down spectroscopy on a small sample volume using a hollow-core photonic crystal fiber — •Dorit Munzke, Michael Böhm, and Oliver Reich — Universität Potsdam, Institut für Chemie, Physikalische Chemie, innoFSPEC, Am Mühlenberg 3, 14476 Potsdam
We present a new experimental setup which is capable to measure small gaseous sample volumes in the microliter range. The core of a hollow-core photonic crystal fiber is used as the sample cell [1]. To check for proper operation, we measure the oxygen concentration of ambient air applying cavity ring-down spectroscopy. This method allows the absolute determination of absorption coefficient without calibration [2]. As an advantage the effective optical path length is increased by the number of passes through the fiber. First results are given showing temporally resolved ring-down events. The resultant absorption coefficient is calculated via the ring-down time. Results are compared to values taken from HITRAN data base.
[1] A. M. Cubillas, J. M. Lazaro, O. M. Conde, M. N. Petrovich and J. M. Lopez-Higuera, Gas sensor based on photonic crystal fibres in the 2ν3 and ν2 + 2ν3 vibrational bands of methane, Sensors, 9 6261-6272, (2009)
[2] G. Berden and R. Engeln, Cavity Ring-Down Spectroscopy - Techniques and Applications, Wiley-Blackwell (2009)