A warning sign for a laser system must include which description?

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

Answer: (A)

Hazard communication for a laser relies on concise, actionable data about the beam. A warning sign should provide the laser type, emitted wavelength, maximum output, pulse duration, and the laser class because these pieces together define the exact danger and the protective measures required. The type and wavelength tell you what materials or tissues are at risk and what eye protection is effective; the maximum output and pulse duration indicate how much energy can reach the eye or skin and whether the beam is continuous or pulsed, which affects exposure limits and PPE needs; the class summarizes overall hazard level and controls like containment, interlocks, or restricted access. Items such as the operator’s name, room color, or installation date don’t communicate the hazard or required safety actions, so they aren’t necessary on a warning sign.