Abstract

Quasi-periodic optical structures are obtained by adding supplementary incident beams on a Jour-beam lattice. These structures are quite different from molasses where the spatial periodicity of the light pattern is preserved although the optical potential is phase-dependent. They arc strongly connected with the field of quasi-crystals which is very active in solid-state physics. Because of the topological invariance of the optical potential, we show that the same spectra are obtained whatever the phases of the incident beams.

© 1996 IEEE