Class 4 lasers are lasers that emit high power beams, typically with an output power greater than 500 milliwatts (mW). These lasers are powerful enough to be potentially hazardous to the eyes and skin, and can even be a fire hazard if not used properly.
Class 4 lasers can be used in a number of areas, such as
Medical: including pain management, physiotherapy and surgery
Industrial applications: such as cutting, welding and engraving
Military and scientific research: for specialised purposes
Due to their high power, safety precautions such as wearing protective eyewear and controlled environments are required when using Class 4 lasers.