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Q: Fachverband Quantenoptik und Photonik

Q 38: Quantum Gases: Bosons V

Q 38.7: Vortrag

Mittwoch, 8. März 2017, 16:00–16:15, P 204

Towards a Photon Bose-Einstein Condensate in the Vacuum-Ultraviolet Spectral Regime — •Christian Wahl, René Nettekoven, Julian Schmitt, Frank Vewinger, and Martin Weitz — University of Bonn, Germany

We propose an experimental approach for photon Bose-Einstein condensation in the vacuum-ultraviolet spectral regime, based on the thermalisation of photons in a noble gas filled optical microcavity. Our current experiments realizing photon Bose-Einstein condensates operate in the visible spectral regime with organic dyes as a thermalisation medium [1]. To reach the vacuum-ultraviolet spectral regime, we propose to replace the dye medium by high pressure xenon or krypton gas with absorption re-emission cycles on the transition from the ground to the lowest electronically excited state of the noble gases for thermalisation. In order to achieve sufficient spectral overlap between the atomic absorption and the di-atomic excimer emission noble gas pressures of up to 60 bar will be created inside the cavity. Using the heavy noble gases xenon and krypton, emission wavelengths in the 120-160 nm regime seem feasible. Current experimental work focuses on verifying the fulfillment of the thermodynamic Kennard-Stepanov frequency scaling between absorption and emission for the dense noble gas medium. The current status of experimental work will be reported. References: [1]: J. Klaers et al. Nature 468, 545-548 (2010)