��-enhanced Sub-Doppler Cooling of Lithium Atoms in D1 Gray Molasses
| Autor: | 15. A. T. Grier, I. Ferrier-Barbut, B. S. Rem, M. Delehaye, L. Khaykovich, F. Chevy, C. Salomon |
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| Rok vydání: | 2013 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1304.6971 |
| Popis: | Following the bichromatic sub-Doppler cooling scheme on the D1 line of 40K recently demonstrated in (Fernandes et al. 2012), we introduce a similar technique for 7Li atoms and obtain temperatures of 60 uK while capturing all of the 5x10^8 atoms present from the previous stage. We investigate the influence of the detuning between the the two cooling frequencies and observe a threefold decrease of the temperature when the Raman condition is fulfilled. We interpret this effect as arising from extra cooling due to long-lived coherences between hyperfine states. Solving the optical Bloch equations for a simplified, ��-type three-level system we identify the presence of an efficient cooling force near the Raman condition. After transfer into a quadrupole magnetic trap, we measure a phase space density of ~10^-5. This laser cooling offers a promising route for fast evaporation of lithium atoms to quantum degeneracy in optical or magnetic traps. 8 pages, 8 figures; submitted to Phys. Rev. A; V2 contains edits in response to referee's comments |
| Databáze: | OpenAIRE |
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