[Laser beam protection in research, technology and the theater]

Detailed limiting values are indicated for inoffensive exposition of eyes and skin to laser radiation. In order to have a simple method of judging the risk, laser classes have been introduced which are briefly described. The most important technical principles for a secure handling of lasers are presented. Their application in laboratory is discussed. Within the field of industrial production, a complete encapsulation of lasers is desirable. Surveying lasers are problematic because the laser hazard area can hardly be limited. If lasers are applied in theaters or performances, the mounted unit has mostly to be submitted to an expert.