Hollow Bessel beams for guiding atoms between vacuum chambers: A proposal and efficiency study

We explore a scheme for guiding cold atoms through a hollow Bessel beam generated by a single axicon and a lens from a 2D magneto-optical trap toward a science chamber. We compare the Bessel beam profiles measured along the optical axis to a numerical propagation of the beam's wavefront, and we...

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Bibliographic Details
Published in:arXiv.org 2020-10
Main Authors: Rivero, Dalila, de Angelis, Vinicius S, Beli, Camila, Moreno, Michelle, Ambrosio, Leonardo, Courteille, Philippe W
Format: Article
Language:English
Subjects:
Algorithms
Beams (radiation)
Cold atoms
Monte Carlo simulation
Runge-Kutta method
Vacuum chambers
Wave fronts
Wave propagation
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Summary:We explore a scheme for guiding cold atoms through a hollow Bessel beam generated by a single axicon and a lens from a 2D magneto-optical trap toward a science chamber. We compare the Bessel beam profiles measured along the optical axis to a numerical propagation of the beam's wavefront, and we show how it is affected by diffraction during the passage through a long narrow funnel serving as a differential pumping tube between the chambers. We derive an approximate analytic expression for the intensity distribution of the Bessel beam and the dipolar optical force acting on the atoms. By a Monte-Carlo simulation based on a stochastic Runge-Kutta algorithm of the motion of atoms initially prepared at a given temperature we show that a considerable enhancement of the transfer efficiency can be expected in the presence of a sufficiently intense Bessel beam.
ISSN:2331-8422
DOI:10.48550/arxiv.2010.09792