Laser cooling limits in fields with a polarisation gradient of atoms with different recoil energies

Based on the numerical solution of the quantum kinetic equation for the atomic density matrix, which makes it possible to accurately take into account the recoil effects in the interaction of atoms with field photons, we have studied the limits of laser cooling of atoms using closed optical transiti...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2020-10, Vol.50 (10), p.939-946
Main Authors: Kirpichnikova, A.A., Prudnikov, O.N., Il'enkov, R.Ya, Taichenachev, A.V., Yudin, V.I.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Cooling
Cooling effects
DENSITY MATRIX
EFFICIENCY
field polarisation
INTERACTIONS
KINETIC EQUATIONS
KINETICS
Laser cooling
laser cooling of atoms
LASERS
LINE WIDTHS
NUMERICAL SOLUTION
optical transitions
Parameters
POLARIZATION
Recoil
recoil parameter
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Summary:Based on the numerical solution of the quantum kinetic equation for the atomic density matrix, which makes it possible to accurately take into account the recoil effects in the interaction of atoms with field photons, we have studied the limits of laser cooling of atoms using closed optical transitions characterised by different recoil parameters (the ratio of the recoil energy to the natural linewidth). It is shown that for optical transitions with an insufficiently small recoil parameter, the polarisation effects, which lead to the possibility of sub-Doppler laser cooling, lose their efficiency and do not ensure an attainment of the temperature below the Doppler limit. The analysis performed allows one to outline the boundaries of the sub-Doppler theory of laser cooling of atoms.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL17408