Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 66: Ultracold atoms and molecules II

Q 66.5: Vortrag

Freitag, 21. März 2014, 15:00–15:15, DO26 208

Simultaneous D1 line sub-Doppler laser cooling of fermionic 6Li and 40K – Experimental results and theory — •Franz Sievers1, Norman Kretzschmar1, Diogo Fernandes1, Daniel Suchet1, Michael Rabinovic1, Saijun Wu2, Lev Khaykovich3, Frédéric Chevy1, and Christophe Salomon11Laboratoire Kastler Brossel, ENS/UPMC/CNRS, 75005 Paris, France — 2Department of Physics, College of Science, Swansea University, SA2 8PP Swansea, United Kingdom — 3Department of Physics, Bar-Ilan University, 52900 Ramat-Gan, Israel

We report on simultaneous sub-Doppler laser cooling of fermionic 6Li and 40K on the D1-transition. We compare the experimental results to a numerical simulation of the cooling process using a semi-classical MonteCarlo wavefunction method. The simulation takes into account the three dimensional optical molasses setup and the vectorial interaction between the polarized light and single atoms at the D1-manifold spanned by the hyperfine Zeeman sub-levels. We find that the simulation and experimental results are in good qualitative agreement.

The D1-molasses phase largely reduces the temperature for both 6Li and 40K, with a final temperature of 44 µK and 20 µK respectively. For both species this leads to a phase-space density close to 10−4. These conditions are well suited to directly load an optical dipole trap or magnetic traps.

Furthermore, we explore a potential application of D1-cooling for 6Li in a lattice trap enabling a quantum gas microscope similar to the case of 87Rb.

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