Section III
Laser Classification
Lasers and laser systems are classified based on their capability of injuring personnel.
- Lasers manufactured after August 1, 1976 are classified and labeled by the manufacturer. The Principal Investigator shall classify lasers and laser systems that are constructed or modified in the laboratory.
- There are five laser hazard classes:
- Class 1 lasers and laser systems cannot emit accessible levels of radiation that are capable of causing eye injury under any normal operating condition. (A more hazardous laser may be embedded in a Class 1 product that is not accessible during normal operating conditions, but may be during service and maintenance.)
- Class 2 lasers and laser systems are visible lasers with an accessible output ≤ 1 mW. Class 2 lasers and laser systems are incapable of causing eye injury unless intentionally viewed directly for an extended period. The normal aversion response to bright light (blinking) protects the eye from a momentary exposure.
- Class 3a lasers and laser systems have an accessible output between 1-5 mW and do not pose a serious eye hazard unless viewed through optical instruments.
- Class 3b lasers and laser systems have an accessible output between 5-500 mW for continuous wave lasers and < 0.125 J within 0.25 second for a pulsed laser. Class 3b lasers and laser systems pose a serious eye hazard from viewing the direct beam or specular reflections.
- Class 4 lasers and laser systems have an accessible output > 500 mW for a continuous wave laser and > 0.125 J within 0.25 second for a pulsed laser. Class 4 lasers and laser systems pose a serious eye hazard from viewing the direct beam, specular reflections and diffuse reflections. Class 4 lasers and laser systems also pose skin and fire hazards.
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