Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line
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Gray molasses is a powerful tool for sub-Doppler laser cooling of atoms to low temperatures. For alkaline atoms, this technique is commonly implemented with cooling lasers which are blue-detuned from either the D1 or D2 line. Here we show that efficient gray molasses can be implemented on the D2 line of 40K with red-detuned lasers. We obtained temperatures of 48(2)µK, which enables direct loading of 9.2(3)x106 atoms from a magneto-optical trap into an optical dipole trap. We support our findings by a one-dimensional model and three-dimensional numerical simulations of the optical Bloch equations which qualitatively reproduce the experimentally observed cooling effects.
Bruce , G D , Haller , E , Peaudecerf , B , Cotta , D A , Andia , M , Wu , S , Johnson , M Y H , Lovett , B W & Kuhr , S 2017 , ' Sub-Doppler laser cooling of 40 K with Raman gray molasses on the D 2 line ' Journal of Physics B: Atomic, Molecular and Optical Physics , vol 50 , no. 9 , 095002 . DOI: 10.1088/1361-6455/aa65ea
Journal of Physics B: Atomic, Molecular and Optical Physics
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