A comprehensive introduction to the theory and applications of lasers. The book contains a detailed description and data on all types of lasers, with references to the diverse applications ranging from material processing, holography, and spectroscopy to medicine. In addition to classical lasers such as ruby and CO2 lasers, this new edition also covers current developments like quantum cascade lasers, diode-pumped solid-state lasers, and femtosecond lasers. The 7th edition has been significantly revised and updated, particularly in its technical aspects.