This book covers the entire field of tunable lasers, with the exception of dye lasers. Following an introductory chapter on common general principles, the remaining chapters - all written by leading experts in the field - each treat a particular class of tunable laser or process. In each case, a theoretical treatment is combined with a detailed practical description of the lasers and their operation. The book is written so as to be readily accessible to researchers and students alike. It is especially intended to enable the non-expert to choose the most appropriate tunable laser for a specific application. In this second edition an added chapter with extensive references to recent literature reviews the advances that haveoccured since the publication of the original edition.