We investigate the sub-Doppler laser cooling of bosonic potassium isotopes, whose small hyperfine splitting has so far prevented cooling below the Doppler temperature. We find instead that the combination of a dark optical molasses scheme that naturally arises in this kind of system and an adiabatic ramping of the laser parameters allows us to reach sub-Doppler temperatures for small laser detunings. We demonstrate temperatures as low as 25±3 μK and 47±5 μK in high-density samples of the two isotopes 39K and 41K, respectively. Our findings should find application to other atomic systems.

Sub-Doppler laser cooling of potassium atoms / M. Landini; S. Roy; L. Carcagní; D. Trypogeorgos; M. Fattori; M. Inguscio; and G. Modugno. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - STAMPA. - 84:(2011), pp. 043432-1-043432-6. [10.1103/PhysRevA.84.043432]

Sub-Doppler laser cooling of potassium atoms

FATTORI, MARCO;INGUSCIO, MASSIMO;MODUGNO, GIOVANNI
2011

Abstract

We investigate the sub-Doppler laser cooling of bosonic potassium isotopes, whose small hyperfine splitting has so far prevented cooling below the Doppler temperature. We find instead that the combination of a dark optical molasses scheme that naturally arises in this kind of system and an adiabatic ramping of the laser parameters allows us to reach sub-Doppler temperatures for small laser detunings. We demonstrate temperatures as low as 25±3 μK and 47±5 μK in high-density samples of the two isotopes 39K and 41K, respectively. Our findings should find application to other atomic systems.
2011
84
043432-1
043432-6
M. Landini; S. Roy; L. Carcagní; D. Trypogeorgos; M. Fattori; M. Inguscio; and G. Modugno
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/643951
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