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

A. A. Kirpichnikova, O. N. Prudnikov, R. Ya Il'Enkov, A. V. Taichenachev, V. I. Yudin

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)939-946
Number of pages8
JournalQuantum Electronics
Volume50
Issue number10
DOIs
Publication statusPublished - 31 Oct 2020

Keywords

  • Density matrix
  • Field polarisation
  • Laser cooling of atoms
  • Optical transitions
  • Recoil parameter

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