Compression and localization of an atomic cloud in a time dependent optical lattice

DOI10.1080/09500340802082376zbMATH Open1151.82440arXivphysics/0610022OpenAlexW1999326743MaRDI QIDQ3543553

Will Williams, M. Saffman

Publication date: 4 December 2008

Published in: Journal of Modern Optics (Search for Journal in Brave)

Abstract: We analyze a method of compressing a cloud of cold atoms by dynamic control of a far off resonance optical lattice. We show that by reducing the lattice spacing either continuously or in discrete steps while cooling the atoms with optical molasses large compression factors can be achieved. Particle motion in the time dependent lattice is studied numerically using a three dimensional semiclassical model. Two experimentally realistic models are analyzed. In the first we continuously vary the lattice beam angles to compress atoms initially in a Gaussian distributed cloud with standard deviation of $250mumm$ into a single site of a two-dimensional lattice of area $Asim35imes35lambd{a}^2$, with $lambda$ the wavelength of the lattice beams. This results in an optical depth for an on-resonant probe beam $>80$ which is an increase by a factor of about 1800 compared to the uncompressed cloud. In the second approach we use a discrete set of lattice beam angles to decrease the spatial scale of the cloud by a factor of 500, and localize a few atoms to a single lattice site with an area $Astackrel<simlambd{a}^2.$

Full work available at URL: https://arxiv.org/abs/physics/0610022

zbMATH Keywords

laser coolingoptical latticecold atomsspatial light modulatoratomic compression

Mathematics Subject Classification ID

Quantum optics (81V80) Statistical mechanics of superconductors (82D55) Statistical mechanics of superfluids (82D50) Quantum dynamics and nonequilibrium statistical mechanics (general) (82C10) Lasers, masers, optical bistability, nonlinear optics (78A60)

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