Resolved diffraction patterns from a reflection grating for atoms
  We have studied atomic diffraction at normal incidence from an evanescent standing wave with a high resolution using velocity selective Raman transitions. We have observed up to 3 resolved orders of diffraction, which are well accounted for by a scalar diffraction theory. In our experiment the transverse coherence length of the source is greater than the period of the diffraction grating. 
J. Esteve, D. Stevens, V. Savalli, N. Westbrook, C. I. Westbrook and   A. Aspect