The book discusses the physical principles and designs of lasers, the properties of laser radiation, issues related to the propagation of la-grain radiation in media and the interaction of radiation with various materials. The manual is intended for a wide range of readers: students studying in the areas of training bachelors "Laser technology and laser technologies," "Photonics and optoinformatics," graduate students and masters of other technical specialties, engineering and technical workers and everyone interested in the current state of laser technology.