Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Poster: Quantum Optics and Photonics I
Q 24.20: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik
Collisional redistribution laser cooling and spectroscopy of high pressure alkali-buffer gas mixtures — •Till Ockenfels1, Stavros Christopoulos1,2, Peter Moroshkin1,3, Frank Vewinger1, and Martin Weitz1 — 1Institut für Angewandte Physik, Universität Bonn, Germany — 2Present address: Department of Science, American University of the Middle East, Kuwait — 3Present address: Okinawa Institute of Science and Technology, Japan
Collisional redistribution laser cooling is a technique applicable to alkali-noble gas mixtures at a typical pressure of a few hundred bars, where the pressure broadening of spectral lines approaches the thermal energy in the gas [1,2]. Frequent atom-noble buffer gas collisions here shift atomic absorption lines into resonance with a far red detuned laser beam, while spontaneous decay occurs close to the unperturbed transition frequency, such that thermal energy is extracted from the sample. In recent work, aiming at a spectroscopic, non-contact temperature measurement of the cooled sample, we have carried out both absorption and emission spectroscopic measurements of the dense rubidium-argon gas mixture. The ratio of absorption and emission spectral profiles was found to follow a Boltzmann-like (Kennard-Stepanov) frequency scaling in the dense gaseous system. We have also determined both pressure broadening and shift of the high-pressure buffer gas D-lines system [3].
[1] P. R. Berman and S. Stenholm, Opt. Commun. 24, 155 (1978).
[2] U. Vogl and M. Weitz, Nature 461, 70 (2009).
[3] S. Christopoulos et al., Phys. Scr. 93, 12 (2018).