Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 11: Poster: Quantum Optics and Photonics I

Q 11.2: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Implementation of lambda-enhanced gray molasses cooling of 87Rb — •Matthias Tarnowski, Benno Rem, Nick Fläschner, Dominik Vogel, Christof Weitenberg, and Klaus Sengstock — Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Efficient laser cooling is an important step in all quantum gas machines. Recently, lambda-enhanced gray molasses cooling on the D1 lines was established for various alkali atoms, leading to substantially lower temperatures compared to the common bright molasses on the D2-line. While gray molasses was first explored with Cs and Rb, the efficiency of lambda-enhancement has so far not been demonstrated for these species. Here, we implement this technique for the first time on the F=2 to F'=2 transition of the 87Rb D2 line and find a pronounced temperature decrease around the two-photon resonance with the repumper, which is produced as a sideband by an EOM. We reach significantly lower temperatures than with the bright molasses. Our results show that the efficiency of laser cooling of rubidium can be substantially increased with little expenses.