Which class of laser has a maximum continuous wave power of 500mW and can be potentially hazardous?

Class 3B lasers are defined as those that have a maximum continuous wave power of up to 500 mW. They are considered potentially hazardous due to their ability to cause damage to the eye if viewed directly. Even diffuse reflections from a Class 3B laser can be hazardous under certain conditions.

The classification system for lasers places Class 3B in a category where safety precautions are necessary, as exposure can lead to injury. This class requires specific safety measures, including protective eyewear, controlled access to laser areas, and proper signage to alert personnel of the potential hazards associated with its use.

In contrast, other classes either represent lower power levels or are considered higher risk. For instance, Class 2 lasers, with maximum power of 1 mW, are generally safe due to the blink reflex, while Class 3R lasers, which can range up to 5 mW, are also deemed less hazardous. Conversely, Class 4 lasers, which exceed 500 mW, present more significant hazards, not only to the eyes but also to the skin and fire risks due to their high power levels. Understanding these classifications is crucial for managing laser safety effectively.