Gray-molasses cooling of 39K to a high phase-space density
1 Laboratoire Charles Fabry, Institut d'Optique, CNRS, Univ Paris- Sud - 2, Avenue Augustin Fresnel, 91127 Palaiseau Cedex, France
2 LP2N, Univ Bordeaux 1, IOGS, CNRS - 351, Cours de la Libération, 33405 Talence, France
Received: 4 October 2013
Accepted: 20 December 2013
We present new techniques in cooling 39K atoms using laser light close to the D1 transition. First, a new compressed-MOT configuration is taking advantage of gray-molasses–type cooling induced by blue-detuned D1 light. It yields an optimized density of atoms. Then, we use pure D1 gray molasses to further cool the atoms to an ultra-low temperature of . The resulting phase-space density is and will ease future experiments with ultracold potassium. As an example, we use it to directly load up to atoms in a far detuned optical trap, a result that opens the way to the all-optical production of potassium degenerate gases.
PACS: 37.10.De – Atom cooling methods / 37.10.Gh – Atom traps and guides / 67.85.-d – Ultracold gases, trapped gases
© EPLA, 2013