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J. C. Fabre and J. C. , Fabre graduated from the Univer- sit6 Paris XI He is preparing a Ph.D. dissertation on the 43m photorefractive materials and their applications with G, 1986.

J. M. Jonathan and . Paris, He received the M.S. degree in physics in 1972 and the Doctorat d'Etat in 1981, both from the Universit6 Pierre et Marie Curie, Paris. Since 1975 he has worked for CNRS at the Institut d'Optique. He described the optically induced anisotropy of silver chloride emulsions and some of its applications to optical data processing he joined the group for nonlinear optics, where he started research on photorefractive materials he spent a year as a research associate with the He is now studying the photorefractive effect in semi-insulators and III-V semiconductor com- pounds, 1950.

G. Roosen and G. , Roosen graduated from the Universite Paris XI in 1969. He received the B Doctorat-es-Sciences (physics) from this university in 1978. He is Directeur S

C. De-recherches, Optique Th6orique et Appliquee , where he is responsible for the research program on nonlinear-optical phenomena in semi-insulating materials . His initial work was in the field of light radiation pressure, including optical levitation and light-power measurement . He spent a year as a visiting scientist at the IBM Research Laboratory), where he studied and developed an opto-optical light-steering technique. His current research interests include the basic physics of nonlinear effects in optical materials