Abstract
We have observed the diffraction of a Bose-Einstein condensate of rubidium atoms on a vibrating mirror potential. The matter wave packet bounces back at normal incidence on a blue-detuned evanescent light field after a $3.6\phantom{\rule{0.3em}{0ex}}\mathrm{mm}$ free fall. The mirror vibrates at a frequency of $500\phantom{\rule{0.3em}{0ex}}\mathrm{kHz}$ with an amplitude of $3\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. The atomic carrier and side bands are directly imaged during their ballistic expansion. The locations and the relative weights of the diffracted atomic wave packets are in very good agreement with the theoretical prediction of Henkel et al. [J. Phys. II 4, 1877 (1994)].
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