Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 4, Pages 692-695Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.692
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We report the observation of harmonic generation and strong nonlinear coupling of two collective modes of a condensed gas of rubidium atoms. Using a modified time averaged orbiting potential trap we changed the trap anisotropy to a value where the frequency of the m = 0 high-lying mode corresponds to twice the frequency of the m = 0 low-lying mode, thus leading to strong nonlinear coupling between these modes. By changing the anisotropy of the trap and exciting the low-lying mode we observed significant frequency shifts of this fundamental mode and also the generation of its second harmonic.
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