Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.65: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Simultaneous D1 line sub-Doppler laser cooling of fermionic 6Li and 40K – Experimental results and theory — •Mihail Rabinovic1, Franz Sievers1, Norman Kretzschmar1, Diogo Fernandes1, Daniel Suchet1, 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, Swansea, SA2 8PP., 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. 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 well suited to directly load an optical dipole trap.

We compare the experimental results to a numerical simulation of the cooling process using a semi-classical MonteCarlo wavefunction method and explore a potential application of D1-cooling for 6Li in a lattice trap.

In the context of laser cooling of 6Li we present an all-solid-state laser source emitting 3.2 W of narrowband 671 nm light in a near-diffraction-limited beam. Our design is based on a diode-end-pumped Nd:YVO4 ring laser operating at 1342 nm which is subsequently frequency doubled.

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