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Conference on Lasers and Electro-Optics

Atom trapping using superimposed Bessel beams

S.B. Cavalcauti, S. Chávez-Cerda, J. Miguel Hickmann

Published Aug 29, 2005• 0 citations

Abstract

Summary form only given. Hollow beams have attracted increasing interest in the field of laser cooling and trapping of neutral atoms. Several groups have used different techniques to generate dark hollow beams (DHB). However, the experimental setups and techniques employed in most of the investigations so far, are rather sophisticated and need usually more than one beam. On the other hand, Bessel beams are easily obtained in practice with a quite simple experimental arrangement. Investigations on the dynamical interplay between superimposed Bessel beams (SBB) has been demonstrated recently theoretically and experimentally. In this paper, we propose a new and simple experimental scheme to produce a dark hollow beam for atom trapping purposes, using the interference pattern originated from two superimposed Bessel beams. We illustrate the propagation of a superposition of two Bessel beams with same amplitude and phase, generated by a quite simple setup made with two annular slits and a lens.

DOI: 10.1109/iqec.2000.907943

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Summary form only given. Recent advances in cold atom physics have seen the emergence of the area of atom guiding along hollow core optical fibres and also along light beams. Both employ the optical dipole force which for suitably tuned light can restrict the atoms to the dark hollow region of the fibre or the light beam. In this work, we discuss and analyse a novel scheme of channelling cold atoms into a high-order Bessel beam (via a high-order Laguerre-Gaussian beam) and demonstrate an efficient method of producing such beams.

We report on a new experimental result to generate dark hollow beams by using a geometric optical method. We propose two new methods to produce focused and localized hollow laser beams by using π-phase plates. Using Monte Carlo simulations, we have studied the Sisyphus cooling of alkali atoms in pyramidal hollow beam gravito-optical traps. We discuss some potential applications of the dark hollow beams in atom optics and the preparation of an all optically-cooled and optically-trapped atomic Bose-Einstein condensation (BEC). Our research shows that an ultracold atomic sample with a temperature of ~2µK can be obtained in the pyramidal hollow beam dipole trap and an all optical-type BEC may be realized in a far blue-detuned, hollow beam trap.

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