Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Theoretical study of deep laser cooling of magnesium atoms

Прудников Олег Николаевич, Denis V. Brazhnikov, A E Bonert, Andrei Goncharov, R. Ya. Ilenkov, A. V. Taǐchenachev, Valeriy I. Yudin

Published Aug 1, 2015• 0 citations

Publisher

Abstract

The two-stage laser cooling strategy for24Mg is proposed. The calculations based on quantum treatment with full account for the recoil effect. The results can assist overcoming current difficulties in deep laser cooling of magnesium.

DOI: 10.1109/cleopr.2015.7376504

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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Theoretical study of deep laser cooling of magnesium atoms

Прудников Олег Николаевич, Denis V. Brazhnikov, A E Bonert, Andrei Goncharov, R. Ya. Ilenkov, A. V. Taǐchenachev, Valeriy I. Yudin

Published Aug 1, 2015• 0 citations

Publisher

Abstract

DOI: 10.1109/cleopr.2015.7376504

Related papers

Quantum treatment of two-stage sub-Doppler laser cooling of magnesium atoms

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Deep laser cooling of

^{24}\mathrm{Mg}

atoms has been theoretically studied. We propose a two-stage sub-Doppler cooling strategy using electrodipole transition $3\phantom{\rule{0.16em}{0ex}}{}^{3}{P}_{2}\ensuremath{\rightarrow}3\phantom{\rule{0.16em}{0ex}}{}^{3}{D}_{3}$ ($\ensuremath{\lambda}\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}383.8$ nm). The first stage implies exploiting magneto-optical trap with ${\ensuremath{\sigma}}^{+}$ and ${\ensuremath{\sigma}}^{\ensuremath{-}}$ light beams, while at the second stage lin $\ensuremath{\perp}$ lin molasses is used. We focus on achieving a large number of ultracold atoms (${T}_{\mathrm{eff}}<10 \ensuremath{\mu}\mathrm{K}$) in a cold-atomic cloud. The calculations have been based on quantum treatment, taking into full account the recoil effect and beyond many widely used approximations. Steady-state values of average kinetic energy and linear momentum distributions of cold atoms have been analyzed for various light-field intensities and frequency detunings. The results of conducted quantum analysis have been significantly different from the results achieved under a semiclassical approximation based on the Fokker-Planck equation. The second cooling stage allows achieving sufficiently lower kinetic energies of the atomic cloud as well as increased fraction of ultracold atoms at certain conditions compared to the first one. We hope that the obtained results can help in overcoming current experimental problems in deep cooling of

^{24}\mathrm{Mg}

atoms by means of laser field. Cold magnesium atoms cooled in a large amount to several $\ensuremath{\mu}\mathrm{K}$ are of huge interest to, for example, quantum metrology and to other many-body cold-atoms physics.

We study laser cooling of

^{24}

Mg atoms in dipole optical trap with pumping field resonant to narrow

(3s3s)\,^1S_0 \rightarrow \, (3s3p)\,^{3}P_1

(

λ= 457

nm) optical transition. For description of laser cooling of atoms in the optical trap with taking into account quantum recoil effects we consider two quantum models. The first one is based on direct numerical solution of quantum kinetic equation for atom density matrix and the second one is simplified model based on decomposition of atom density matrix over vibration states in the dipole trap. We search pumping field intensity and detuning for minimum cooling energy and fast laser cooling.