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- W1620238838 abstract "Title of Dissertation: HOLLOW BEAM ATOM TUNNEL Yonho Song, Doctor of Philosophy, 1999 Dissertation directed by: Professor Wendell T. Hill III Institute for Physical Science and Technology One of the more promising proposals for guiding and focusing neutral atoms involves dark hollow laser beams. When the frequency of the laser is detuned to the blue of resonance, the dipole force the atoms feel in the light confines them to the dark core where the atoms can be transported with minimal interaction with the light. The ability of the all-light atom guides to transport large number of ultracold atoms for long distances without physical walls leads to the possibility of a versatile tool for atom lithography, atom interferometry, atomic spectroscopy as well as for transporting and manipulating Bose-Einstein condensates. Furthermore since the atoms transported in alllight atom guides do not come into contact with matter, they can in principle be used to transport antimatter as well. In this work a hollow beam atom tunnel is demonstrated by guiding magnetooptically trapped ultracold cesium atoms with a hollow core laser beam. The 1mm diameter diffractionless hollow beam used to construct the atom tunnel was generated from a TEM00 mode diode laser at 852 nm using a series of axicons and simple lenses. The axicon generated hollow beam has a dark core extended for most of its diameter and steep walls suitable for an atom guide. Ultracold cesium atoms loaded into the tunnel from a MOT spend 90% of their time in the dark, scattering photons only when they collide with the light walls. We modeled the evolution of atoms using the interaction between the atoms and the light walls, which agreed well with experimental observations. The direction and speed of the atoms in the tunnel can be controlled by varying the detuning of the tunnel beam. The ability to vary the core size of the hollow beam makes the all-light atom guide potentially useful for focusing neutral atoms. The atoms could be focused as tight as the core size of the hollow beam at its waist. This new focusing scheme, called the atom funnel, would not show spherical and chromatic aberrations that conventional harmonic focusing suffers from." @default.
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- W1620238838 date "1999-01-01" @default.
- W1620238838 modified "2023-09-27" @default.
- W1620238838 title "Hollow-beam atom tunnel" @default.
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