Laser controlled areas must be posted with the appropriate warning signs at the entryway(s) and within the laser controlled area

• Warning: Must be used with all signs and labels associated with all Class 3R and most Class 4 lasers and laser systems that exceed the appropriate MPE for irradiance, and all Class 3b lasers and most Class 4 laser systems.
• Danger: Must be used with all signs and labels associated with a Class 4 laser and laser system with high power (multi-kW) or pulse energy.
• Caution: Must be used with all signs and labels associated with Class 2 and 2M lasers and laser systems, and all Class 3R lasers and laser systems that do not exceed the appropriate MPE for irradiance.
• Notice: Must be used on signs posted outside a temporary laser controlled area. The area within the temporary controlled area must also have appropriate signs posted (danger warning for Class 3b or Class 4).