Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 46: Quantum Gases (Bosons) IV
Q 46.2: Vortrag
Donnerstag, 14. März 2019, 11:00–11:15, S HS 037 Informatik
Phase Space Compression of Light by Thermalization of a 2D Photon Gas — •Erik Busley1, Christian Kurtscheid1, Fahri Öztürk1, Julian Schmitt1, 2, and Martin Weitz1 — 1Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, D-53115 Bonn — 2Present address: Cavendish Laboratory, University of Cambridge, United Kingdom
A two-dimensional photon gas confined in an optical microcavity can exhibit both thermalization and – above a critical particle number – Bose-Einstein condensation, as shown in earlier work of our group [1, 2]. The used short spacing of the two curved mirrors of the microcavity makes the system equivalent to a two-dimensional, harmonically trapped one of massive bosons, where thermalization of the photon gas is achieved by subsequent absorption and emission cycles on the dye molecules.
Notably, photon thermalization in the trapping potential can besides a spectral also lead to a spatial redistribution of photons. Here we investigate an expected phase space compression of photons below the threshold to Bose-Einstein condensation from the thermalization, which results in an effective cooling of the photon cloud in the trapping potential. The variation of the final phase space density is studied versus the thermalization time. The current status of the experiment will be reported.
[1] J. Klärs et al., Nature 468, 545 (2010)
J. Klärs et al., Nat. Phys. 6, 512 (2010)