Hannover 2010 – scientific programme
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A: Fachverband Atomphysik
A 23: Poster II
A 23.26: Poster
Thursday, March 11, 2010, 16:30–19:00, Lichthof
An interferometrically generated optical bottle beam trap — •Johannes Nipper1, Siyuan Zhang2, and Mark Saffman2 — 15. Physikalisches Institut, Universität Stuttgart, Germany — 2Department of Physics, University of Wisconsin, Madison, WI, USA
We report on a blue detuned optical dipole trap for Cs atoms. Destructive interference of two fundamental Gaussian beams in a Mach-Zehnder interferometer with unequal magnifications in the two arms of the interferometer forms an intensity zero in the focus of the interfered beams, surrounded by regions of higher intensity. This so-called bottle beam creates a trapping potential at moderately high laser intensities, sufficiently deep to trap atoms from a magneto-optical trap. Fast optics with a high numerical aperture forms trap sizes suitable for single atom trapping.
Blue detuned dark traps allow simultaneous trapping of ground state atoms and Rydberg atoms. Furthermore scattering rates and inhomogeneous light shifts due to high light intensities are reduced compared to red dipole traps.