All-optical production of 6Li quantum gases

23rd International Laser Physics Workshop

Burchianti, A.^1,2 ; Seman, J.A.^1,2,3 ; Valtolina, G.^1,2,4 ; Morales, A.^5 ; Inguscio, M.^2,6 ; Zaccanti, M.^1,2 ; Roati, G.^1,2

INO-CNR, via Nello Carrara 1, Sesto Fiorentino

50019, Italy^1

LENS and Università di Firenze, Via Nello Carrara 1, Sesto Fiorentino

50019, Italy^2

Present Address: Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, México Distrito Federal

01000, Mexico^3

Scuola Normale Superiore, Piazza dei Cavalieri 7, Pisa

56126, Italy^4

Department of Physics, ETH Zurich, Zürich

8093, Switzerland^5

INRIM, Strada delle Cacce 91, Torino

10135, Italy^6

关键词: Bose-Einstein condensates;    Degenerate Fermi gas;    Experimental cycles;    High-resolution imaging;    Interacting superfluids;    Magnetooptical traps;    Optical dipole traps;    Trapping potential;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/594/1/012042/pdf
DOI  :  10.1088/1742-6596/594/1/012042

来源: IOP

【 摘 要 】

We report efficient production of quantum gases of6Li using a sub-Doppler cooling scheme based on the D1 transition. After loading in a standard magneto-optical trap, an atomic sample of 109atoms is cooled at a temperature of 40 μK by a bichromatic D1 gray-molasses. More than 2×107atoms are then transferred into a high-intensity optical dipole trap, where a two-spin state mixture is evaporatively cooled down to quantum degeneracy. We observe that D1 cooling remains effective in the deep trapping potential, allowing an effective increase of the atomic phase-space density before starting the evaporation. In a total experimental cycle of 11 s, we produce weakly-interacting degenerate Fermi gases of 7×105atoms at T/TF 5molecules. We further describe a simple and compact optical system both for high-resolution imaging and for imprinting a thin optical barrier on the atomic cloud; this represents a first step towards the study of quantum tunneling in strongly interacting superfluid Fermi gases.