Laser cooling based on dark states, i.e. states decoupled from light, has proven to be e ective to increase the phase-space density of cold trapped atoms. Dark-states cooling requires open atomic transitions, in contrast to the ordinary laser cooling used for example in magneto-optical traps (MOTs), which operate on closed atomic transitions. For alkali atoms, dark-states cooling is therefore commonly operated on the D1 transition nS1/2 → nP1/2. We show that, for 87Rb, thanks to the large hyper ne structure separations the use of this transition is not strictly necessary and that “quasi-dark state” cooling is e cient also on the D2 line, 5S1/2 → 5P3/2. We report temperatures as low as (4.0 ± 0.3) μK and an increase of almost an order of magnitude in the phase space density with respect to ordinary laser sub-Doppler cooling.
Λ-enhanced grey molasses on the D2 transition of Rubidium-87 atoms / Sara, Rosi; Alessia, Burchianti; Stefano, Conclave; Naik, Devang S.; Giacomo, Roati; Chiara, Fort; Francesco, Minardi. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - ELETTRONICO. - 8:(2018), pp. 1-9. [10.1038/s41598-018-19814-z]
Λ-enhanced grey molasses on the D2 transition of Rubidium-87 atoms
ROSI, SARA;Stefano Conclave;NAIK, DEVANG SUMANTRAI;Giacomo Roati;Chiara Fort;Francesco Minardi
2018
Abstract
Laser cooling based on dark states, i.e. states decoupled from light, has proven to be e ective to increase the phase-space density of cold trapped atoms. Dark-states cooling requires open atomic transitions, in contrast to the ordinary laser cooling used for example in magneto-optical traps (MOTs), which operate on closed atomic transitions. For alkali atoms, dark-states cooling is therefore commonly operated on the D1 transition nS1/2 → nP1/2. We show that, for 87Rb, thanks to the large hyper ne structure separations the use of this transition is not strictly necessary and that “quasi-dark state” cooling is e cient also on the D2 line, 5S1/2 → 5P3/2. We report temperatures as low as (4.0 ± 0.3) μK and an increase of almost an order of magnitude in the phase space density with respect to ordinary laser sub-Doppler cooling.File | Dimensione | Formato | |
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