Cooling atoms in an optical trap by selective parametric excitation

Abstract

We demonstrate the possibility of energy-selective removal of cold atoms from a tight optical trap by means of parametric excitation of the trap vibrational modes. Taking advantage of the anharmonicity of the trap potential, we selectively remove the most energetic trapped atoms or excite those at the bottom of the trap by tuning the parametric modulation frequency. This process, which had been previously identified as a possible source of heating, also appears to be a robust way for forcing evaporative cooling in anharmonic traps.

arXiv comment5 pages, 5 figures

References in corpus (7)

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• Trapping of single atoms in cavity QED
• Ultrastable CO2 Laser Trapping of Lithium Fermions
• Very long storage times and evaporative cooling of cesium atoms in a quasi-electrostatic dipole trap
• Anharmonic parametric excitation in optical lattices
• Evaluation of heating effects on atoms trapped in an optical trap
• An Optical Trap for Collisional Studies on Cold Fermionic Potassium

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• Parametric cooling of a degenerate Fermi gas in an optical trap
• Trapping cold ground state argon atoms for sympathetic cooling of molecules
• Direct cooling in an optical lattice by amplitude modulation
• Continuous parametric feedback cooling of a single atom in an optical cavity
• Shaking-induced dynamics of cold atoms in magnetic traps