Sub-Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses

Sub-Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses

We demonstrate sub-Doppler cooling of 40K on the D1 atomic transition. Using a gray-molasses scheme, we efficiently cool a compressed cloud of 6.5 × 108 atoms from ∼4 mK to 20 μK in 8 ms. After transfer to a quadrupole magnetic trap, we measure a phase space density of ∼10−5. This technique offers a...

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Veröffentlicht in:Europhysics letters 2012-12, Vol.100 (6)
Hauptverfasser: Rio Fernandes, D., Sievers, F., Kretzschmar, N., Wu, S., Salomon, C., Chevy, F.
Format: Artikel
Sprache:eng
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37.10.De
37.10.Gh
67.85.-d
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Zusammenfassung:We demonstrate sub-Doppler cooling of 40K on the D1 atomic transition. Using a gray-molasses scheme, we efficiently cool a compressed cloud of 6.5 × 108 atoms from ∼4 mK to 20 μK in 8 ms. After transfer to a quadrupole magnetic trap, we measure a phase space density of ∼10−5. This technique offers a promising route for fast evaporation of fermionic 40K.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/100/63001