Which class of laser is considered to have no hazard under normal use?

Class 1 lasers are classified as having no hazard under normal usage conditions. This classification is due to their design, which ensures that the output power of the laser beam is so low that it does not pose a risk for eye injury or skin damage, even when viewed directly. Class 1 lasers are typically found in devices like laser printers and CD players, where the potential for exposure is minimal and controlled.

Lasers in the other classes—Class 2, Class 3, and Class 4—present varying degrees of hazards, particularly when it comes to eye safety. Class 2 lasers can cause eye damage if viewed for extended periods, whereas Class 3 lasers may cause eye injury with accidental exposure. Class 4 lasers are even more powerful and pose significant risks, including potential burns and fire hazards. Understanding these classifications is crucial for ensuring safety in environments where lasers are used.