| Popis: |
Parametric excitation of ultracold atomic gases in optical dipole traps strongly depends on the trap anharmonicity. For non-interacting gases, the anharmonicity prevents energy input beyond certain level. We use this as a basis for precision measurement of trap parameters. The frequencies and depth are derived from comparison of the excitation spectrum to models, where the anharmonicity is treated non-perturbatively. Measurements are done for both quantum and classical motion of trapped atoms. For the classical motion, the validity of the model is crosschecked in an independent experiment. |
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