dorsal/arxiv
View SchemaMode conversion in optical beam in order to create funnel shaped optical near field to collect cold Rb atoms from MOT
| Authors | S. M. Iftiquar |
|---|---|
| Categories | |
| ArXiv ID | physics/0306021 |
| URL | https://arxiv.org/abs/physics/0306021 |
Abstract
Doughnut shaped light beam has been generated from Gaussian mode ($TEM_{00}$) cw-Ti sapphire laser. After splitting the pump beam into two equal intensity components and introducing unequal convergence and phase delay while they are recombined it results in doughnut mode. Such a beam is tunable and have long propagation length. The evanescent field generated by 360 mW (at 780 nm wavelength) of such a beam creates optical field of 600 nm decay length with a 5.75 neV repulsive dipole potential. Thus cold Rb atoms (at 10{$\mu$}K or less temperature) released from MOT can be reflected by the surface so that the atoms are collected ultimately at the bottom of the prism. By focussing such doughnut beam with 8 cm focal length converging lens, the dark radius reduces to 22{$\mu$}. We also observe such beam to contain azimuthal phase as well as radial phase distribution.
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"date_created": "2026-03-02T18:00:43.203000Z",
"date_modified": "2026-03-02T18:00:43.203000Z",
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"abstract": "Doughnut shaped light beam has been generated from Gaussian mode ($TEM_{00}$)\ncw-Ti sapphire laser. After splitting the pump beam into two equal intensity\ncomponents and introducing unequal convergence and phase delay while they are\nrecombined it results in doughnut mode. Such a beam is tunable and have long\npropagation length. The evanescent field generated by 360 mW (at 780 nm\nwavelength) of such a beam creates optical field of 600 nm decay length with a\n5.75 neV repulsive dipole potential. Thus cold Rb atoms (at 10{$\\mu$}K or less\ntemperature) released from MOT can be reflected by the surface so that the\natoms are collected ultimately at the bottom of the prism. By focussing such\ndoughnut beam with 8 cm focal length converging lens, the dark radius reduces\nto 22{$\\mu$}. We also observe such beam to contain azimuthal phase as well as\nradial phase distribution.",
"arxiv_id": "physics/0306021",
"authors": [
"S. M. Iftiquar"
],
"categories": [
"physics.optics"
],
"title": "Mode conversion in optical beam in order to create funnel shaped optical near field to collect cold Rb atoms from MOT",
"url": "https://arxiv.org/abs/physics/0306021"
},
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