We report on the realization of sub-Doppler laser cooling of sodium atoms in gray molasses using the D1 optical transition (3sS1/2→3pP1/2) at 589.8 nm. The technique is applied to samples containing 3×10^9 atoms, previously cooled to 350μK in a magneto-optical trap, and it leads to temperatures as low as 9μK and phase-space densities in the range of 10^−4. The capture efficiency of the gray molasses is larger than 2/3, and we observe no density-dependent heating for densities up to 10^11cm^−3.
Sub-Doppler cooling of sodium atoms in gray molasses / Colzi, Giacomo; Durastante, Gianmaria; Fava, Eleonora; Serafini, Simone; Lamporesi, Giacomo; Ferrari, Gabriele. - In: PHYSICAL REVIEW A. - ISSN 2469-9926. - ELETTRONICO. - 2016:93(2016), p. 023421. [http://dx.doi.org/10.1103/PhysRevA.93.023421]
Sub-Doppler cooling of sodium atoms in gray molasses
Colzi, Giacomo;Fava, Eleonora;Serafini, Simone;Lamporesi, Giacomo;Ferrari, Gabriele
2016-01-01
Abstract
We report on the realization of sub-Doppler laser cooling of sodium atoms in gray molasses using the D1 optical transition (3sS1/2→3pP1/2) at 589.8 nm. The technique is applied to samples containing 3×10^9 atoms, previously cooled to 350μK in a magneto-optical trap, and it leads to temperatures as low as 9μK and phase-space densities in the range of 10^−4. The capture efficiency of the gray molasses is larger than 2/3, and we observe no density-dependent heating for densities up to 10^11cm^−3.| File | Dimensione | Formato | |
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