Sub-Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses
1 Laboratoire Kastler-Brossel, École Normale Supérieure, CNRS and UPMC - 24 rue Lhomond 75005 Paris, France, EU
2 Department of Physics, College of Science, Swansea University - Swansea, SA2 8PP UK, EU
Received: 4 October 2012
Accepted: 23 November 2012
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.
PACS: 37.10.De – Atom cooling methods / 37.10.Gh – Atom traps and guides / 67.85.-d – Ultracold gases, trapped gases
© EPLA, 2012