2006
DOI: 10.1063/1.2266164
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Loading dynamics of optical trap and parametric excitation resonances of trapped atoms

Abstract: We study the loading dynamics of an optical dipole trap and an optical lattice both experimentally and theoretically. A simple power dependence for the number of trapped atoms (N∝P3∕2) is revealed in both cases. We then study the parametric excitation of the trapped atoms. High order parametric resonance is observed close to but lower than 4ν in a CO2 laser optical lattice. The existence of the high harmonic and its shift toward lower frequency are attributed to the anharmonicity of the optical trapping potent… Show more

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Cited by 16 publications
(20 citation statements)
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“…For trap depth determination of an optical dipole trap, measurements of beam waist and trap oscillation frequencies can be used to infer the depth. However, this procedure, as well as the interpretation of parametric heating experiments [43], can be complicated by the broadening and shift of the trap frequency and higher harmonics caused by the anharmonicity of the trapping potential [44][45][46]. A measurement of the differential ac Stark shift of the atoms in the dipole trap can provide a lower bound on trap depth so long as both the ground-and excited-state polarizabilites are well known.…”
mentioning
confidence: 99%
“…For trap depth determination of an optical dipole trap, measurements of beam waist and trap oscillation frequencies can be used to infer the depth. However, this procedure, as well as the interpretation of parametric heating experiments [43], can be complicated by the broadening and shift of the trap frequency and higher harmonics caused by the anharmonicity of the trapping potential [44][45][46]. A measurement of the differential ac Stark shift of the atoms in the dipole trap can provide a lower bound on trap depth so long as both the ground-and excited-state polarizabilites are well known.…”
mentioning
confidence: 99%
“…Parametric excitation, in which the FORT power is modulated to excite parametric resonances in the atomic motion, is widely used to characterize the trap frequencies in optically-trapped atomic gases [30,31]. With ensembles the heating rate, and thus the rate of loss from the trap, shows resonances at specific frequencies.…”
Section: Parametric Resonances and Trap Frequencymentioning
confidence: 99%
“…In the harmonic approximation, these occur at double the trap frequencies, due to the even symmetry of the perturbation to the potential. Corrections due to trap anharmonicity have been studied [30] and the technique has been applied to single atoms [32].…”
Section: Parametric Resonances and Trap Frequencymentioning
confidence: 99%
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“…In the situation presented in the current work, the optical trap is produced with a focused standing wave beam, where the atoms are constrained to within half a wavelength in the axial direction and more weakly by the transverse profile. In work by Wu et al, optical lattice trapping has been modelled, where it was assumed that all the atoms with kinetic energy less than the potential depth were trapped [22]. In our simulation we treat the ratio of lattice waist size to atomic cloud size as an adjustable parameter (relevant to most experiments), and compute the fraction of atoms remaining in the trap to investigate transfer efficiency.…”
Section: Introductionmentioning
confidence: 99%