Laser Spectroscopy of Atoms Guided by Evanescent Waves in Micron-Sized Hollow Optical Fibers

Ito, Hajime; Nakata, T.; Sakaki, Keiji; Ohtsu, Motoichi; Lee, K. I.; Jhe, Wonho

doi:10.1103/physrevlett.76.4500

Cited by 250 publications

(81 citation statements)

References 12 publications

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“…One important scheme relies on the guidance of atoms in light fields themselves guided in hollow fibers [271,272,273,274,275,276,277,278]. This promises to remove the contraints of gaussian optics for freely propagating beams and to realise long, curved guiding structures with spatially constant and high confinement.…”

Section: Optical Guidesmentioning

confidence: 99%

Physics with coherent matter waves

Bongs¹,

Sengstock²

2004

Rep. Prog. Phys.

176

190

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Abstract. This review discusses progress in the new field of coherent matter waves, in particular with respect to Bose-Einstein condensates. We give a short introduction to Bose-Einstein condensation and the theoretical description of the condensate wavefunction. We concentrate on the coherence properties of this new type of matter wave as a basis for fundamental physics and applications. The main part of this review treats various measurements and concepts in the physics with coherent matter waves. In particular we present phase manipulation methods, atom lasers, nonlinear atom optics, optical elements, interferometry and physics in optical lattices. We give an overview of the state of the art in the respective fields and discuss achievements and challenges for the future. § To whom correspondence should be addressed (sengstock@physnet.uni-hamburg.de) Physics with coherent matter waves 2

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Section: Optical Guidesmentioning

confidence: 99%

Physics with coherent matter waves

Bongs¹,

Sengstock²

2004

Rep. Prog. Phys.

176

190

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“…Following the first theoretical proposals [10,11], roomtemperature atom guidance in glass capillaries was quickly demonstrated using red-detuned Gaussian beams [12] as well as blue-detuned evanescent waves [13,14]. In contrast to guiding with red-detuned beams, which draw atoms into the high intensity areas of the beam, bluedetuned guides present the inherent advantage of minimizing the heating of atoms due to spontaneous emission and reduce perturbation of the energy levels by the light potential (Stark shifting) [11].…”

Section: Introductionmentioning

confidence: 99%

Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel

et al. 2011

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We theoretically investigate the process of coupling cold atoms into the core of a hollow-core photonic-crystal optical fiber using a blue-detuned Laguerre-Gaussian beam. In contrast to the use of a red-detuned Gaussian beam to couple the atoms, the blue-detuned hollow-beam can confine cold atoms to the darkest regions of the beam thereby minimizing shifts in the internal states and making the guide highly robust to heating effects. This single optical beam is used as both a funnel and guide to maximize the number of atoms into the fiber. In the proposed experiment, Rb atoms are loaded into a magneto-optical trap (MOT) above a vertically-oriented optical fiber. We observe a gravito-optical trapping effect for atoms with high orbital momentum around the trap axis, which prevents atoms from coupling to the fiber: these atoms lack the kinetic energy to escape the potential and are thus trapped in the laser funnel indefinitely. We find that by reducing the dipolar force to the point at which the trapping effect just vanishes, it is possible to optimize the coupling of atoms into the fiber. Our simulations predict that by using a low-power (2.5 mW) and far-detuned (300 GHz) Laguerre-Gaussian beam with a 20-µm radius core hollow-fiber it is possible to couple 11% of the atoms from a MOT 9 mm away from the fiber. When MOT is positioned further away, coupling efficiencies over 50% can be achieved with larger core fibers.

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“…The optical force from a dielectric wire carrying photons can also be used to trap and guide cold atoms [4]. Such an atom guide is made from a hollow optical fiber with light propagating in the glass and tuned far to blue of atomic resonance [5,6]. Inside the fiber, the evanescent wave decays exponentially away from the wall, producing a repulsive potential which guides atoms along the center axis.…”

mentioning

confidence: 99%

Atom trapping and guiding with a subwavelength-diameter optical fiber

et al. 2004

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We suggest using an evanescent wave around a thin fiber to trap atoms. We show that the gradient force of a red-detuned evanescent-wave field in the fundamental mode of a silica fiber can balance the centrifugal force when the fiber diameter is about two times smaller than the wavelength of the light and the component of the angular momentum of the atoms along the fiber axis is in an appropriate range. As an example, the system should be realizable for Cesium atoms at a temperature of less than 0.29 mK using a silica fiber with a radius of 0.2 µm and a 1.3-µm-wavelength light with a power of about 27 mW.

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Laser Spectroscopy of Atoms Guided by Evanescent Waves in Micron-Sized Hollow Optical Fibers

Cited by 250 publications

References 12 publications

Physics with coherent matter waves

Physics with coherent matter waves

Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel

Atom trapping and guiding with a subwavelength-diameter optical fiber

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