Edited by Ileana Rau and Francois Kajzar, Multiphoton Processes in Organic Materials and Their Application contains original contributions from leading international scientists working in the field of multiphoton absorptions and excitations and their practical applications. From the first theoretical prediction of the phenomena at the beginning of the nineteen thirties through the first practical demonstration seen some thirty years later, the topic has today evolved into a large branch of nonlinear optics. The book is addressed not only to the researchers active in the field but also to graduate students, newcomers and development engineers interested in practical application of multiphoton induced effects.