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Holographie dynamique pour les atomes froids : modes de Laguerre-Gauss et leurs variantes

Fabienne Diry 1
1 Atomes froids et holographie
LAC - Laboratoire Aimé Cotton
Abstract : This thesis deals with shaping lasers by holography in order to create dipolar potentials for cold atoms. These experiments described in the manuscript use a spatial light modulator to shape the laser beam by modifying his phase. With this device, it is possible to produce hollow beams which are beams containing a dark center. When they are blue-detuned, hollow beams are really interesting to trap cold atoms because, in that case, atoms are attracted to dark regions and so losses due to spontaneous emission are negligible. We have generated quasi Laguerre-Gaussian beams in which we have guided cold atoms. One of the advantages of these beams is that the holograms to produce them are analytical. It is a helical phase hologram. Some quantitative results are obtained and compared to a model which calculates the capture efficiency. In the second part of this work, we are interested in the modification of the helical hologram to produce other kinds of hollow beams. In order to choose which phase to apply on the SLM, we have developed a model to know the beam characteristics when it propagates. This model is based on the beam decomposition of the electric field over Laguerre-Gauss basis LGpl. We have produced a hole in the ring of Laguerre-Gaussian beams and also cross which becomes polygonal when it propagates. These potentials can be applied for new experiment in particular in the study of chaotic systems.
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Submitted on : Friday, November 18, 2011 - 6:24:22 PM
Last modification on : Wednesday, September 16, 2020 - 5:42:34 PM
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  • HAL Id : tel-00642811, version 1



Fabienne Diry. Holographie dynamique pour les atomes froids : modes de Laguerre-Gauss et leurs variantes. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2009. Français. ⟨tel-00642811⟩



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