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arXiv · 1512.07053

Sub-Doppler cooling of sodium atoms in gray molasses

Giacomo Colzi·Gianmaria Durastante·Eleonora Fava·Simone Serafini·Giacomo Lamporesi·Gabriele Ferrari
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Abstract

We report on the realization of sub-Doppler laser cooling of sodium atoms in gray molasses using the D1 optical transition ($3s\, ^2S_{1/2} \rightarrow 3p\, ^2P_{1/2}$) at 589.8 nm. The technique is applied to samples containing $3\times10^9$ atoms, previously cooled to 350 $\mu$K in a magneto-optical trap, and it leads to temperatures as low as 9 $\mu$K 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 $10^{11}$ cm$^{-3}$.

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Giacomo Colzi, Gianmaria Durastante, Eleonora Fava, Simone Serafini, Giacomo Lamporesi, Gabriele Ferrari. 2015-12-22. Sub-Doppler cooling of sodium atoms in gray molasses. https://doi.org/10.1103/physreva.93.023421

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