How many classes of LASER are there?

The correct answer is five. LASERs, which stands for Light Amplification by Stimulated Emission of Radiation, are categorized into different classes based primarily on their potential hazards to the eyes and skin.

The classification system includes Class 1, Class 1M, Class 2, Class 2M, Class 3R, Class 3B, and Class 4. However, for the purpose of understanding the main types of LASER systems and their classifications, it is common to group them into five recognizable categories based on their increasing potential for harm. This framework allows operators and users to better gauge safety precautions necessary when working with or in the vicinity of LASERs.

Thus, recognizing five classes of LASER effectively captures the essence of how LASERs are grouped based on their characteristics and potential risk, making it relevant for personnel who need to manage or operate these devices safely.