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Journal of Experimental and Theoretical Physics

Theory of sub-Doppler cooling of three-level {Lambda} atoms in standing light waves

D. V. Kosachev, Yu. V. Rozhdestvenskiǐ

Published Dec 1, 1994• 0 citations
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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 6, 1996•0 citations
We present an investigation of an alternative mechanism for sub-Doppler cooling of atoms, based on a coherent population transfer in three-level \ensuremath{\Lambda} systems. The mechanism considered is that of a \ensuremath{\Lambda} atom interacting with two standing light waves with a mutual spatial phase shift cphi\ensuremath{\ne}0. The spatial dependence of the level populations of the \ensuremath{\Lambda} atom for different values of cphi is presented. For cphi\ensuremath{\ne}0, this clearly demonstrates coherent population transfer in an atom with transverse motion along the space-shifted nodes and antinodes of the two standing waves. We show that this allows translational temperatures well below the Doppler limit TD{\mathit{T}}_{\mathit{D}}TD​=${\mathrm{\ensuremath{\Elzxh}}}_{\ensuremath{\gamma}}$/kB{\mathit{k}}_{\mathit{B}}kB​ to be achieved.
We examine the laser cooling of three-level (Lambda) -atoms in the field of two standing waves when frequency detunings are considerably greater than natural width of the excited state as well as the Rabi frequencies in the system. It is shown that at the difference of frequency detunings is small when compared to the Rabi frequencies sub-Doppler cooling of the (Lambda) -atom is possible. We present the dependence of the light pressure force on the atoms velocity and dependence of cooled atoms temperature on the parameters of the exciting waves.