Журнал Экспериментальной и Теоретической Физики

Laser Cooling of Lithium-6 Atoms in a Bichromatic Light Field

R. Ya. Ilenkov, Прудников Олег Николаевич, Anastasia Kirpichnikova, A. V Taychenachev, Valeriy I. Yudin

Published Dec 15, 2023• 0 citations

Abstract

The kinetics of6Li atoms in a bichromatic laser field exciting transitions on D2 and D1 lines is investigated. The model takes into account the complex real structure of energy levels of6Li (including the Zeeman degeneracy) as well as the nonuniform spatial polarization of the laser field. It is found that detuning and the polarization configuration of the light field component of the resonant D2 line of the6Li atom are of fundamental importance for laser cooling. The possibility of cooling of atoms below the Doppler limit is demonstrated.

DOI: 10.31857/s0044451023080138

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Журнал Экспериментальной и Теоретической Физики

Laser Cooling of Lithium-6 Atoms in a Bichromatic Light Field

R. Ya. Ilenkov, Прудников Олег Николаевич, Anastasia Kirpichnikova, A. V Taychenachev, Valeriy I. Yudin

Published Dec 15, 2023• 0 citations

Publisher

Abstract

DOI: 10.31857/s0044451023080138

Related papers

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arXiv:1410.8545Physical Review AFeb 23, 201554 citations

We report on simultaneous sub-Doppler laser cooling of fermionic

^{6}\mathrm{Li}

and

^{40}\mathrm{K}

using the

{D}_{1}

optical transitions. We compare experimental results to a numerical simulation of the cooling process applying a semiclassical Monte Carlo wave-function method. The simulation takes into account the three-dimensional optical molasses setup and the dipole interaction between atoms and the bichromatic light field driving the

{D}_{1}

transitions. We discuss the physical mechanisms at play, identify the important role of coherences between the ground-state hyperfine levels, and compare

{D}_{1}

and

{D}_{2}

sub-Doppler cooling. In 5 ms, the

{D}_{1}

molasses phase greatly reduces the temperature for both

^{6}\mathrm{Li}

and

^{40}\mathrm{K}

at the same time, with final temperatures of 44 and $11\ensuremath{\mu}\mathrm{K}$, respectively. For both species this leads to a phase-space density close to ${10}^{\ensuremath{-}4}$. These conditions are well suited to direct loading of an optical or magnetic trap for efficient evaporative cooling to quantum degeneracy.