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The requirements for light beam installations for thermal technologies (welding, cutting, etc.), as well as the theory of laser beam power, properties of laser beams, physical processes in carbon dioxide, neodymium, semiconductor, excimer lasers are described.

The textbook is intended for students of technical universities specialising in the design of lasers and laser technological complexes and in the use of laser beams in thermal technologies. It may also be useful for students of other universities and specialities studying laser physics.