All-optical production and transport of a large ⁶Li quantum gas in a crossed optical dipole trap

2016/05/11 by Ch. Gross, H. C. J. Gan, K. Dieckmann · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #physics.atom-ph

paper · pdf · doi:10.1103/physreva.93.053424

published as Phys. Rev. A 93, 053424 (2016)

arxiv created 2016/05/11 · arxiv updated 2016/06/01

Abstract

We report on an efficient production scheme for a large quantum degenerate sample of fermionic lithium. The approach is based on our previous work on narrow-line 2S_1/2→ 3P_3/2 laser cooling resulting in a high phase-space density of up to 3×10^-4. This allows utilizing a large volume crossed optical dipole trap with a total power of 45 \textrmW, leading to high loading efficiency and 8×10⁶ trapped atoms. The same optical trapping configuration is used for rapid adiabatic transport over a distance of 25 \textrmcm in 0.9 \textrms, and subsequent evaporative cooling. With optimized evaporation we achieve a degenerate Fermi gas with 1.7× 10⁶ atoms at a temperature of 60 \textrmnK, corresponding to T/T_F=0.16(2 ). Furthermore, the performance is demonstrated by evaporation near a broad Feshbach resonance creating a molecular Bose-Einstein condensate of 3×10⁵ lithium dimers.

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