Absorption spectroscopy of xenon and ethylene–noble gas mixtures at high pressure: towards Bose–Einstein condensation of vacuum ultraviolet photons
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Bose–Einstein condensation is a phenomenon well known for material particles as cold atomic gases, and this concept has in recent years been extended to photons confined in microscopic optical cavities. Essential for the operation of such a photon condensate is a thermalization mechanism that conserves the average particle number, as in the visible spectral regime can be realized by subsequent absorption re-emission processes in dye molecules. Here we report on the status of an experimental effort aiming at the extension of the concept of Bose–Einstein condensation of photons towards the vacuum ultraviolet spectral regime, with gases at high-pressure conditions serving as a thermalization medium for the photon gas. We have recorded absorption spectra of xenon gas at up to 30 bar gas pressure of the \(5p^6\)–\(5p^56s\) transition with a wavelength close to 147 nm. Moreover, spectra of ethylene noble gas mixtures between 158 and 180 nm wavelength are reported.
KeywordsEinstein Condensation Vacuum Ultraviolet Spectral Regime Photon Condensate Xenon System
We acknowledge support of the Deutsche Forschungsgemeinschaft (within SFB/TRR 185 and We1748-17) and the European Research Council (INPEC). We thank G. Wallstabe for his contributions in the early phase of this experiment.
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