Distributed quasi-Bragg beam splitter in crossed atomic waveguides

Abstract We perform an experimental and theoretical study of a novel distributed quasi-Bragg splitter for cold atoms propagating in crossed optical waveguides. The atoms are guided by horizontal red-detuned laser beams which cross with an angle of roughly 90°. The lattice formed by the interference...

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Autores principales:	V. Guarrera, R. Moore, A. Bunting, T. Vanderbruggen, Y. B. Ovchinnikov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/be9cf41edd914e7281ba7fd1fead0907
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spelling	oai:doaj.org-article:be9cf41edd914e7281ba7fd1fead09072021-12-02T11:52:57ZDistributed quasi-Bragg beam splitter in crossed atomic waveguides10.1038/s41598-017-04710-92045-2322https://doaj.org/article/be9cf41edd914e7281ba7fd1fead09072017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04710-9https://doaj.org/toc/2045-2322Abstract We perform an experimental and theoretical study of a novel distributed quasi-Bragg splitter for cold atoms propagating in crossed optical waveguides. The atoms are guided by horizontal red-detuned laser beams which cross with an angle of roughly 90°. The lattice formed by the interference between the two waveguides is used as a quasi-Bragg splitter to continuously deflect the atomic flux from one waveguide into the other. In the limit of strong waveguide confinement and depending on the velocity of the cloud, three main regimes are observed corresponding (1) to the absence of reflection, (2) to partial reflection and (3) to full reflection into the second waveguide. In view of the application to atom interferometry, the condition to split the cloud into mainly two equally-populated fragments is only met in the highest velocity regime, where the fraction of reflected and transmitted atoms can be controlled by tuning the lattice height. A diagnostic of the momentum distribution shows that a quasi-Bragg splitter with the occupation of mainly two momentum states is achieved in this regime. This behaviour can be understood by considering the band structure associated with the potential in the crossing region and agrees with numerical simulations of the atomic dynamics.V. GuarreraR. MooreA. BuntingT. VanderbruggenY. B. OvchinnikovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q V. Guarrera R. Moore A. Bunting T. Vanderbruggen Y. B. Ovchinnikov Distributed quasi-Bragg beam splitter in crossed atomic waveguides
description	Abstract We perform an experimental and theoretical study of a novel distributed quasi-Bragg splitter for cold atoms propagating in crossed optical waveguides. The atoms are guided by horizontal red-detuned laser beams which cross with an angle of roughly 90°. The lattice formed by the interference between the two waveguides is used as a quasi-Bragg splitter to continuously deflect the atomic flux from one waveguide into the other. In the limit of strong waveguide confinement and depending on the velocity of the cloud, three main regimes are observed corresponding (1) to the absence of reflection, (2) to partial reflection and (3) to full reflection into the second waveguide. In view of the application to atom interferometry, the condition to split the cloud into mainly two equally-populated fragments is only met in the highest velocity regime, where the fraction of reflected and transmitted atoms can be controlled by tuning the lattice height. A diagnostic of the momentum distribution shows that a quasi-Bragg splitter with the occupation of mainly two momentum states is achieved in this regime. This behaviour can be understood by considering the band structure associated with the potential in the crossing region and agrees with numerical simulations of the atomic dynamics.
format	article
author	V. Guarrera R. Moore A. Bunting T. Vanderbruggen Y. B. Ovchinnikov
author_facet	V. Guarrera R. Moore A. Bunting T. Vanderbruggen Y. B. Ovchinnikov
author_sort	V. Guarrera
title	Distributed quasi-Bragg beam splitter in crossed atomic waveguides
title_short	Distributed quasi-Bragg beam splitter in crossed atomic waveguides
title_full	Distributed quasi-Bragg beam splitter in crossed atomic waveguides
title_fullStr	Distributed quasi-Bragg beam splitter in crossed atomic waveguides
title_full_unstemmed	Distributed quasi-Bragg beam splitter in crossed atomic waveguides
title_sort	distributed quasi-bragg beam splitter in crossed atomic waveguides
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/be9cf41edd914e7281ba7fd1fead0907
work_keys_str_mv	AT vguarrera distributedquasibraggbeamsplitterincrossedatomicwaveguides AT rmoore distributedquasibraggbeamsplitterincrossedatomicwaveguides AT abunting distributedquasibraggbeamsplitterincrossedatomicwaveguides AT tvanderbruggen distributedquasibraggbeamsplitterincrossedatomicwaveguides AT ybovchinnikov distributedquasibraggbeamsplitterincrossedatomicwaveguides
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Distributed quasi-Bragg beam splitter in crossed atomic waveguides

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