Just after the International Quantum Electronics Conference, which took place in Tokyo, July 18-21, 1988, a symposium on "Nonlinear Optics of Org ics and Semiconductors" was held on the Hongo campus of the University of Tokyo on July 25 and 26, 1988. Recently, nonlinear optical materials have started to attract the attention of many scientists, not only in the field of quantum electronics but also in organic chemistry, and solid-state physics, especially semiconductor physics. Therefore this area of investigation is really interdisciplinary and necessitates understanding from different...