A classification system is used to assess the potential optical hazards associated with lasers. Laser manufacturers are required to supply full details on the classification of each product. Class 1 - no risk and no special precautions needed. Every attempt must be made to use the least hazardous laser practicable for student experimental work and lecture demonstrations.
Hazards arise in addition to that of the laser radiation itself.
Where protective goggles are used, they must be specifically designed for use with laser radiation. Care must be taken to ensure that the optical density of the lenses is sufficient to reduce the laser radiation hazard below the maximum permitted exposure levels. Warning notices to must be posted where lasers are being used. We are all responsible for safety in the workplace.