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Diffraction-limited optics for single-atom manipulation

Yvan R. P. Sortais 1 H Marion 1 C Tuchendler 1 M Lamare 2 P Fournet 2 C Armellin 2 R Mercier 2 G Messin 1 Antoine Browaeys 1 Philippe Grangier 1 
1 Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
2 Laboratoire Charles Fabry de l'Institut d'Optique / Scop
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : We present an optical system designed to capture and observe a single neutral atom in an optical dipole trap, created by focusing a laser beam using a large-numerical-aperture (NA= 0.5) aspheric lens. We experimentally evaluate the performance of the optical system and show that it is diffraction limited over a broad spectral range (~200 nm) with a large transverse field (±25 µm) The optical tweezer created at the focal point of the lens is able to trap single atoms of 87 Rb and to detect them individually with a large collection efficiency. We measure the oscillation frequency of the atom in the dipole trap and use this value as an independent deter-mination of the waist of the optical tweezer. Finally, we produce with the same lens two dipole traps separated by 2.2 µm and show that the imaging system can resolve the two atoms.
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Yvan R. P. Sortais, H Marion, C Tuchendler, M Lamare, P Fournet, et al.. Diffraction-limited optics for single-atom manipulation. Physical Review A, American Physical Society, 2007, 75, pp.013406. ⟨10.1103/PhysRevA.75.013406⟩. ⟨hal-00509083⟩

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