Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.70: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Optical imaging of thermal and condensed gases — •Cristina Gherasim, Soenke Beck, and Reinhold Walser — Institute for Applied Physics, TU Darmstadt, Germany

Absorption imaging is the standard way of observing trapped atomic gases. From the two dimensional column integrated densities, one obtains optical images on CCD devices after propagation through an optical system, i.e. abberated lenses, λ/4 plates, vacuum windows, beam splitters etc. In order to assess the fidelity of optically measured particle densities, we analyze the performance of realistic imaging setups for thermal clouds and strongly interacting Bose-Einstein condensates. Using optical design software we model the optical setup of the QUANTUS experiment [1] with geometric ray tracing and wave optics. We compare the 2D density of the atomic cloud with its optical image n^2D=log(I_o^vac/I_o^BEC)/(2 α) [2].

[1] T. van Zoest et al, Science, 328, 1540 (2010).

[2] W. Ketterle, D.S. Durfee and D.M. Stamper-Kurn, Proceedings of the International School of Physics "Enrico Fermi" Course CXL (1999)

Acknowledgments: This project is supported by the Deutsche Luft und Raumfahrt Agentur (DLR Grant: 50 WM 1137).