Distributed quasi-Bragg beam splitter in crossed atomic waveguides

Research output: Contribution to journalArticlepeer-review

Standard

Distributed quasi-Bragg beam splitter in crossed atomic waveguides. / Guarrera, Vera; Moore, Richard; Bunting, Alexander; Vanderbruggen, Thomas ; Ovchinnikov, Yuri.

In: Scientific Reports, Vol. 7, No. 4749, 06.07.2017.

Research output: Contribution to journalArticlepeer-review

Harvard

APA

Vancouver

Author

Guarrera, Vera ; Moore, Richard ; Bunting, Alexander ; Vanderbruggen, Thomas ; Ovchinnikov, Yuri. / Distributed quasi-Bragg beam splitter in crossed atomic waveguides. In: Scientific Reports. 2017 ; Vol. 7, No. 4749.

Bibtex

@article{fb60dd7714f94970adc974cb45f46493,
title = "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 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.",
author = "Vera Guarrera and Richard Moore and Alexander Bunting and Thomas Vanderbruggen and Yuri Ovchinnikov",
year = "2017",
month = jul,
day = "6",
doi = "10.1038/s41598-017-04710-9",
language = "English",
volume = "7",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
number = "4749",

}

RIS

TY - JOUR

T1 - Distributed quasi-Bragg beam splitter in crossed atomic waveguides

AU - Guarrera, Vera

AU - Moore, Richard

AU - Bunting, Alexander

AU - Vanderbruggen, Thomas

AU - Ovchinnikov, Yuri

PY - 2017/7/6

Y1 - 2017/7/6

N2 - 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.

AB - 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.

U2 - 10.1038/s41598-017-04710-9

DO - 10.1038/s41598-017-04710-9

M3 - Article

VL - 7

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 4749

ER -