Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)

Q 25.13: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

High-pressure xenon-noble gas mixtures as a thermalization mediator for VUV photons — •Thilo Falk vom Hövel, Eric Boltersdorf, Frank Vewinger, and Martin Weitz — Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn

In recent years, microcavity-based Bose-Einstein condensates of photons have become an established experimental platform. In these experiments, photons in the green-to-orange spectral range are confined to high-finesse microcavities filled with a liquid dye solution. Via repeated absorption and emission cycles, the photons adopt a thermal energy distribution, mediated by the thermalization of the dye molecules’ rovibronic levels. Conveying these principles into the VUV spectral regime (100 - 200 nm) would allow for the construction of a coherent light source in a regime where the realization of a laser is difficult. For this endeavor, we intend to replace the dye molecules by a dense xenon-noble gas mixture, with xenon as the optically active constituent. For thermalization, we aim to exploit the transitions around a wavelength of 147 nm between the quasimolecular states associated with the (atomic) 5p⁶ and 5p⁵6s levels. We report on recent results on the spectroscopic investigation of such mixtures, with sample pressures of up to 100 bar. Centerpiece is a detailed study of absorption and emission spectra, with particular emphasis on the influence of the constituent partial pressures. The fulfillment of the thermodynamic Kennard-Stepanov relation is investigated, which constitutes an essential prerequisite for the suitability of a medium as a thermalization mediator for photons.

Keywords: Bose-Einstein Condensation; High-pressure; VUV