Major aspects of nonlinear optics have been discussed in this book. Characterization of properties of light traversal in non-linear media has always intrigued scientists and researchers. Accelerated advancement of laser techniques and optoelectronic devices account for a crucial task of formulating and analyzing the structures capable of efficiently transforming, modulating, and recording optical data in a wide spectrum of radiation energy densities and frequencies at one hand, and novel approaches and schemes capable of activating and stimulating the contemporary features on the other. It is a known fact that the phenomena and materials of nonlinear optics have an assuring place in dealing with these intricate technical tasks. The state-of-the-art ideas, approaches, and information presented in this book will be beneficial to the readers in developing a sustainable solution in basic analysis as well as industrial approach. The aim of this book is to serve as a useful source of information for students, researchers, engineers and technical officers of optoelectronic universities and companies.