Written for engineers, scientists, technicians, and novices, this text explains the underlying physics and engineering applicable to all lasers, without sidetracking into the mathematical details of quantum electronics. The book outlines the characteristics and applications of commercial lasers worldwide and provides a survey of modern lasers. It also discusses light and optics, the fundamental elements of lasers, and laser modification. Semiconductor lasers, solid-state lasers, ion lasers, HeNe lasers, HeCd lasers, carbon dioxide lasers, excimer lasers, and ultrafast lasers are all considered.