SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 68: Quantum Gases: Bosons V
Q 68.3: Vortrag
Freitag, 10. März 2023, 15:00–15:15, B305
Spectroscopy of xenon-helium mixtures for Bose-Einstein condensation of vacuum-ultraviolet photons — •Thilo vom Hövel, Eric Boltersdorf, Frank Vewinger, and Martin Weitz — Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, D-53115 Bonn
Bose-Einstein condensation of visible spectral range photons is currently investigated in our and other groups using liquid dye solutions as thermalization media for photon gases in optical microcavities. We here propose an experimental approach to apply these principles for the construction of a coherent light source in the VUV (100 - 200nm), a wavelength regime for which it is difficult to construct lasers due to the high pump power needed to achieve population inversion in active media.
As dye solutions are not suitable for VUV operation, an alternative thermalization medium needs to be found, allowing for contact to the thermal environment by repeated absorption and re-emission of photons. Our candidate are dense heteronuclear xenon-helium mixtures with absorption and emission features around 147nm wavelength, provided by quasi-molecular states formed from the atomic xenon’s 5p6 and 5p56s states, respectively. We here report on recent spectroscopic investigations of such samples at high pressure, with particular emphasis on the spectral overlap between absorption and emission profiles. Further, results on the validity of the thermodynamic Kennard-Stepanov relation are presented, whose fulfillment is a prerequisite for the proposed approach.