Picosecond investigation of photorefractive and free carrier gratings in GaAs: EL2 and CdTe: V Philippe Delaye, Kestutis Jarasiunas, Jean-Claude Launay and Gérald Roosen J. Phys. III France, 3 7 (1993) 1291-1303 DOI: 10.1051/jp3:1993199