Sub-doppler laser cooling of thulium atoms in a magneto-optical trap |
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Authors: | D Sukachev A Sokolov K Chebakov A Akimov N Kolachevsky and V Sorokin |
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Institution: | 1.Lebedev Physical Institute,Moscow,Russia |
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Abstract: | Sub-Doppler laser cooling in a magneto-optical trap for thulium atoms at a wavelength of 410.6 nm has been experimentally
studied. Without any dedicated molasses period of sub-Doppler cooling, the cloud of 3 × 106 atoms at a temperature of 25(5) μK was observed. The measured temperature is significantly lower than the Doppler limit of
240 μK for the cooling transition at 410.6 nm. The high efficiency of the sub-Doppler cooling process is due to a near-degeneracy
of the Landé g-factors of the lower 4f
136s
2 (J = 7/2) and the upper 4f
125d
3/26s
2 (J = 9/2) cooling levels. |
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Keywords: | |
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