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Q: Fachverband Quantenoptik und Photonik
Q 42: Laser and Laser Applications
Q 42.2: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
Microcavity based photothermal spectroscopy — •Matthias Mader1,2 and Theodor W. Hänsch1,2 — 1Ludwig-Maximilians-Universität München, Fakultät für Physik, Geschwister-Scholl-Platz 1, 80539 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching
Sensitive optical spectroscopy of tiny amounts of gases allows to study dynamic processes as well as processes where only small gas volumes are involved e.g. in biology or medicine. Furthermore, a small detection volumes enables miniaturization of the measurement devices making it possible to easily perform to experiments also outside the lab, e.g. for climate research.
Here, cavity-sensed photo thermal-spectroscopy is used to perform background free absorption spectroscopy. For macroscopic volumes, this technique has been shown to be extremely sensitive [1]. Combining it with microscopic fiber-based high-finesse Fabry-Pérot cavities [2] allows to miniaturize the detection volume while sustaining high sensitivity.
We present first experiments towards miniaturization of photo thermal absorption spectroscopy using a microscopic cavity as detector with a detection volume of 900 µ m3 and we show first measurements on oxygen achieving a sensitivity below 5% for the volume concentration.
[1] Waclawek et al, Opt. Express 29, 7794-7808 (2021)
[2] Hunger et al, New J. Phys. 12 065038 (2010)