Before entering the lab, look to see if the light outside of the room is flashing, therefore showing that the laser is in use and goggles must be on. Avoid looking at laser light reflected from any shiny surfaces. All areas in which lasers and other high intensity light sources are being used should be clearly marked with appropriate warning labels. Do not enter areas where lasers are being operated except when you are accompanied by a faculty member or student who is familiar with laser operation. Always be sure that you know where the laser beam is directed in any experiment.
Most lasers have high voltages associated with their power supplies.
All precautions outlined in this manual for working with electrical equipment should be followed. High intensity ultraviolet lamps any many laser power supplies produce ozone. Adequate ventilation is essential in such cases. Eye goggles which absorb the laser radiation should be worn where appropriate. Broad band absorption goggles which hinder vision, and hence introduce additional safety hazards, should be avoided.