Pulsed polarization gradient cooling in an optical dipole trap with a Laguerre-Gaussian laser beam |
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| Authors: | Y Torii N Shiokawa T Hirano T Kuga Y Shimizu H Sasada |
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| Institution: | (1) Institute of Physics, University of Tokyo, 3-8-1 Komaba, Meguro-ku Tokyo 153, Japan, JP;(2) Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223, Japan, JP |
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| Abstract: | We utilized a blue-detuned Laguerre-Gaussian (doughnut) laser beam to trap cold rubidium atoms by optical dipole force. ”Pulsed”
polarization gradient cooling was applied to the trapped atoms to suppress the trap loss due to heating caused by random photon
scattering of the trapping light. In this trap about 108 atoms were initially captured and the trap lifetime was 1.5 s, which was consistent with losses due to background gas collisions.
This trap can readily be applied to atom guiding, compression, and evaporative cooling.
Received: 10 July 1997 / Received in final form: 5 January 1998 / Accepted: 16 January 1998 |
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| Keywords: | PACS 32 80 Pj Optical cooling of atoms trapping - 39 90 +d Other instrumentation and techniques for atomic and molecular physics |
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