The field of nonlinear optics has witnessed a tremendous evolution since its beginnings in the early sixties. Its frontiers have been extended in many direc- tions and its techniques have intruded upon many areas of both fundamental and practical interest. The field itself has been enriched with many new phe- nomena and concepts that have further extended its scope and strengthened its connection with other areas. As a consequence, it is becoming increasingly unrealistic to expect to cover the different facets and trends of this field in the lectures or proceed- ings of a summer school,...