What information must a warning sign for a laser system include?

• A. The type of laser, emitted wavelength, maximum output, pulse duration, and the class of the laser
• B. The color of the laser housing
• C. The location of the laser room
• D. The operator's name

Answer: (A)

Warning signs for a laser system must communicate the specific characteristics that determine how dangerous the beam could be and what precautions are needed. Including the type of laser, the emitted wavelength, the maximum output, the pulse duration, and the class of the laser gives an exact picture of the hazard: the kind of damage to expect, what protective eyewear or shielding is appropriate, and what exposure limits apply. The wavelength and laser type indicate what tissues or materials are at risk, while the maximum output and pulse duration show how much energy could be delivered and whether the beam is continuous or pulsed, which directly affects injury risk and required controls. The class level summarizes the overall hazard and dictates the minimum safety measures, such as access controls, interlocks, enclosure requirements, and PPE.

Details like the color of the laser housing, the room’s location, or the operator’s name don’t convey hazard information or required precautions, so they aren’t essential on the warning sign.