Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 8: Quantum Optics and Photonics I

Q 8.4: Talk

Monday, March 11, 2019, 11:15–11:30, S Ex 04 E-Tech

Towards a Photon Bose-Einstein Condensate in the Vacuum-Ultraviolet Spectral Regime — •Thilo vom Hövel, Christian Wahl, Frank Vewinger, and Martin Weitz — Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, D-53115 Bonn

We propose an experimental approach for photon Bose-Einstein condensation in the vacuum-ultraviolet spectral regime (100 - 200 nm), based on the thermalization of photons in a noble gas-filled optical microcavity. Current experiments realizing photon Bose-Einstein condensates operate in the visible spectral regime with organic dyes as a thermalization medium. To reach the vacuum-ultraviolet spectral regime, we plan to replace the dye medium by high pressure xenon gas, with absorption re-emission cycles on the transition from the ground to the lowest electronically excited state of the noble gas for thermalization. We here report the results of current spectroscopic measurements, investigating VUV line profiles of dense Xenon ensembles. To achieve sufficient spectral overlap between the atomic absorption and the di-atomic excimer emission, found at 146.9 nm and 172 nm, respectively, noble gas pressures of up to 180 bar are investigated. Alternatively, liquid xenon at temperatures down to -110 °C could be used.