Electro-optic and magneto-optic materials : ECO1, 22-23 September 1988, Hamburg, Federal Republic of Germany / Jean-Pierre Huignard, chair/editor ; sponsored by EPS--European Physical Society, Europtica--the European Federation for Applied Optics, SPIE--the International Society for Optical Engineering ; cooperating organizations, ANRT--Association nationale de la recherche technique [and others].