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Acta Physica Polonica A

Open-Loop Control for Focusing of Neutral Particles by Modulated Optical Field

Sergey Borisenok, Nayyer Iqbal

Published Oct 1, 2008• 0 citations
Publisher

Abstract

We propose open-loop control model of focusing cooled quantum particles in 1D and 2D modulated optical field.Applying Kapitza's procedure of averaging, we demonstrate that the type of attractor in the fixed points can be controlled by changing the parameters of control optical field.We support our conclusions by simulation for harmonic control.

DOI
10.12693/aphyspola.114.751

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We propose open-loop control model of focusing cooled quantum particles in 1D and 2D modulated optical field.Applying Kapitza's procedure of averaging, we demonstrate that the type of attractor in the fixed points can be controlled by changing the parameters of control optical field.We support our conclusions by simulation for harmonic control.
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We explore the prospects of optical shaking, a recently suggested generic approach to laser cooling of neutral atoms and molecules. Optical shaking combines elements of Sisyphus cooling and of stochastic cooling techniques and is based on feedback-controlled interaction of particles with strong nonresonant laser fields. The feedback loop guarantees a monotonous energy decrease without a loss of particles. We discuss two types of feedback algorithms and provide an analytical estimation of their cooling rate. We study the robustness of optical shaking against noise and establish minimal stability requirements for the lasers. The analytical predictions are in a good agreement with the results of detailed numerical simulations.
The ultra-short optical pulses can be used for the confinement of neutral particles by an additional optical longitudinal force, connected with the Poynting vector and the influence of the magnetic field on their polarizability. The Poynting vector is connected also to the intensity of the electromagnetic field. On other hand, the intensity of a laser pulse can be manipulated by an optical lens, and thus, indirectly, the optical force can be increased or decreased or its direction to be changed. This in turn enables a unique possibility for the compression of neutral atoms, molecules, and particles into the focus of the lens. Here, we reported on an experimental study of neutral particle confinement in the focus of femtosecond laser pulses and further confirmed by a theoretical investigation. The findings demonstrate an innovative approach to the compression and confinement of neutral particles within the focal plane of a lens and their further manipulation. Feasible applications could be in the field of cold nuclear fusion and cooling of light-neutral atoms and molecules.