Bragg scattering of slow atoms from a standing light wave
Fakultät für Physik, Universität Konstanz - Postfach 5560,
D-78434 Konstanz, Germany
Accepted: 25 March 1996
Slow atoms from a magneto-optical trap are used to study diffraction from a near-resonant standing-wave light field. Long interaction times make it possible to observe unidirectional Bragg scattering. In particular, the Pendellösung interference effect between two resonant momentum states is demonstrated for first- and second-order diffraction. The oscillation frequency of second-order scattering shows a transition from a four-photon–type process at low light intensity to a two-photon–type process at higher intensity. The data are in quantitative agreement with a theoretical description which takes into account lowest-energy momentum states.
PACS: 42.50.Vk – Mechanical effects of light on atoms, molecules, electrons, and ions / 32.80.-t – Photon interactions with atoms / 32.80.Pj – Optical cooling of atoms; trapping
© EDP Sciences, 1996