Demonstration of a blazed grating beam splitter for two-level atoms

Johnson, K. S.; Chu, A.; Berggren, Karl K.; Prentiss, Mara

doi:10.1016/0030-4018(96)00045-4

Cited by 11 publications

(4 citation statements)

References 19 publications

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“…In the first approach, the atoms have to be in the superposition of two different internal states that are associated with two different external motional states. A predetermined number of photon momenta can be transferred to atoms by successively inducing the transitions between the two states while alternatively changing the direction of the light fields [2][3][4]. In the second approach, the atoms stay in a single (adiabatic) internal state throughout the interaction, and the motion of atoms can be described by a scalar matterwave in a periodic light shift potential [5].…”

Section: Introductionmentioning

confidence: 99%

Splitting matter waves using an optimized standing-wave light-pulse sequence

Wang

Diot

et al. 2005

Phys. Rev. A

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Abstract:In a recent experiment [1], it was observed that a sequence of two standing wave square pulses can split a BEC at rest into +/-2 k diffraction orders with almost 100% efficiency.By truncating the Raman-Nath equations to a 2-state model, we provide an intuitive picture that explains this double square pulse beamsplitter scheme. We further show it is possible to optimize a standingwave multi square pulse sequence to efficiently diffract an atom at rest to symmetric superposition of +/-2n k diffraction order with n>1. The approach is considered to be qualitatively different from the traditional light pulse schemes in the Bragg or the Raman-Nath region, and can be extended to more complex atomic optical elements that produce various tailored output momentum states from a cold atom source.2

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Section: Introductionmentioning

confidence: 99%

Splitting matter waves using an optimized standing-wave light-pulse sequence

Wang

Diot

et al. 2005

Phys. Rev. A

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“…A remarkable property of these forces (large magnitude in comparison with radiation forces, insensitivity to atomic velocity) allows for fast atomic beam deceleration [23] and for large angle deflections [24]. The triangular potential associated with a bichromatic field was predicted in [25], and scattering off this field has been observed [26] and studied for twolevel [27,26] and three level atoms [28][29][30][31]. Moreover, it has been shown [32] that atoms can be scattered with unit probability with a given change of momentum if a "counterintuitive pulse sequence" is used.…”

Section: Introductionmentioning

confidence: 99%

Atom gratings produced by large-angle atom beam splitters

Dubetsky

Berman

2001

Phys. Rev. A

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An asymptotic theory of atom scattering by large amplitude periodic potentials is developed in the Raman-Nath approximation. The atom grating profile resulting from the scattering is evaluated in the Fresnel zone for triangular, sinusoidal, magneto-optical, and bichromatic field potentials. Analytic asymptotic expressions are obtained for the Fourier components of the atomic wave function following scattering. It is shown that, owing to the scattering into two groups of momentum states rather than two distinct momentum components, the corresponding spatial density profiles differ significantly from pure sinusoids.having period /2n . The prototype LABS consists of a V potentialoff of which atoms scatter. The function f (t), normalized such that ͐ Ϫ/2 /2 f (t)dtϭ1, describes the potential experienced by an atom in its rest frame ͓tϭx/u, where u is the projection of the atom velocity along the beam propagation direction (x axis͒ and is the pulse duration in the atomic rest frame͔ ͓11͔. It is assumed throughout this paper that the temporal width is sufficiently small to allow the atom-field interaction to be considered in an impulse ͑Raman-Nath͒ approximation. A sufficient condition for the Raman-Nath approximation to hold iswhere m is the atomic mass.In the past several years, a number of methods have been proposed for using counterpropagating optical fields to create PHYSICAL REVIEW A, VOLUME 64, 063612

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“…The mechanism of coherent beam splitting can be explained by use of a π-pulse picture [4,7,8]. This simple model is related to the fact that the bichromatic standing wave with frequency difference 2δ can be treated as a superposition of two counterpropagating intensity-modulated travelling waves.…”

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confidence: 99%

“…In this way, relative temporal phases will be synchronized. The spatial phases may be controlled with movable retroreflecting mirrors [8].…”

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confidence: 99%