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AIP conference proceedings

Peculiarities of kinetics and dynamics of laser cooling of atoms in quantum regimes

R. Ya. Ilenkov, Прудников Олег Николаевич, A. V. Taǐchenachev, Valeriy I. Yudin

Published Jan 1, 2019• 0 citations
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Abstract

The work is devoted to the study of the features of momentum distributions of two-level atoms in the field of a one-dimensional standing light wave with full account of the effects of recoil and spatial localization. The cooling of strontium, calcium, and magnesium atoms on a narrow optical transition 1S0→3P1 was studied. Equivalence of momentum distributions and dynamic cooling characteristics for different atoms was found.

DOI
10.1063/1.5089838

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The work is devoted to the study of the features of momentum distributions of two-level atoms in the field of a one-dimensional standing light wave with full account of the effects of recoil and spatial localization. The cooling of strontium, calcium, and magnesium atoms on a narrow optical transition 1S0→3P1 was studied. Equivalence of momentum distributions and dynamic cooling characteristics for different atoms was found.
The setting time of the stationary distribution over translational degrees of freedom of two-level atoms in the field of a one-dimensional standing light wave is studied. The dependences of this time on the problem parameters such as the light wave intensity, frequency detuning, and atom mass are obtained. Calculations are performed on the basis of the quantum-mechanical equation for the atomic density matrix taking completely into account the recoil and spatial localization effects in an arbitrarily intense light field.
We study laser cooling of atoms with narrow-line optical transition, i.e. in regimes when quantum nature of laser-light interactions results significant effect on atom kinetics. We demonstrate the minimum of laser cooing temperature is reached for the light field detuning close to -3 recoil frequency, i.e. is much differ from standard Doppler cooling theory is used for semiclassical description of laser cooling. We define a set of dimensionless parameters that describe the steady state solution of cold atom distribution in laser light and cooling time. The results can be used for analysis an optimal conditions of laser cooling of atoms with narrow lines Ca, Sr and Mg are of interest for optical time standards.
The laser cooling of atoms with a narrow-line optical transition, i.e., in regimes of quantum nature of laser-light interactions resulting in a significant recoil effect, is studied. It is demonstrated that a minimum laser-cooling temperature for two-level atoms in a standing wave reached for red detuning close to three recoil frequencies is vastly different from the theory used for a semiclassical description of Doppler cooling. A set of dimensionless parameters uniquely characterizing the time evolution and the steady state of different atoms with narrow-line optical transitions in the laser field is introduced. The results can be used for analysis of optimal conditions for laser cooling of atoms with narrow lines such as Ca, Sr, and Mg, which are of great interest for atomic clocks.
We study the laser cooling of atoms with a narrow-line optical transition in monochromatic laser light, i.e. in regimes of quantum nature of laser-light interactions resulting in a significant recoil effect. It is demonstrated that a minimum laser cooling temperature for two-level atom in standing wave reached for red detuning close to 3 recoil frequency, greatly different from the theory used for a semiclassical description of Doppler cooling. A set of dimensionless parameters uniquely characterizing the time evolution and the steady state of different atoms with narrow-line optical transitions in the laser field is introduced. The results can be used for analysis of optimal conditions for laser cooling of atoms with narrow lines such as Ca, Sr, and Mg, which are of great interest for atomic clocks.