This book took shape at the unique interdisciplinary engineering school at Dartmouth College. It assumes engineers of all stripes may end up working in technical areas impacted by Nonlinear Optics (NLO) and would benefit by learning about the field. Each section follows a set format, beginning by describing some exciting new technology made possible by NLO. This is followed by a description of the background information necessary for students to understand the basic NLO concepts for that application. The author occasionally includes personal experiences as a pioneer in this field where it provides additional understanding and motivation. Each section ends with a description of other developments in technology that use the same NLO concept.