Mode conversion in optical beam in order to create funnel shaped optical near field to collect cold Rb atoms from MOT
| dc.creator | Iftiquar, S. M. | |
| dc.date | 2003-06-03 | |
| dc.date.accessioned | 2026-07-07T05:49:19Z | |
| dc.date.available | 2026-07-07T05:49:19Z | |
| dc.description | 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{$μ$}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{$μ$}. We also observe such beam to contain azimuthal phase as well as radial phase distribution. | |
| dc.description | 17 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/physics/0306021 | |
| dc.identifier | http://arxiv.org/abs/physics/0306021 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/85349 | |
| dc.subject | Optics | |
| dc.title | Mode conversion in optical beam in order to create funnel shaped optical near field to collect cold Rb atoms from MOT | |
| dc.type | text |