Which LASER class is High power?

• A. Class IV
• B. Class I
• C. Class II
• D. Class IIIb

Answer: (A)

High-power lasers are classified as the most hazardous category because their energy can cause immediate, permanent eye injuries or skin burns and can even ignite materials. This level of risk is why the highest class is designated as such—Class IV. Access to these devices is tightly controlled, with safeguards like beam enclosures, interlocks, warning signs, protective eyewear, and trained personnel handling them.

Lower-power classes do not present the same level of danger under typical use. Class I is considered safe in normal operation, Class II is low-power and eye protection is primarily the natural blink reflex, and Class IIIa/IIIb involve moderate hazards mainly to the eyes if directly viewed, but do not carry the same fire and diffuse-reflection risks as Class IV.