Fire Hazards

Class 4 laser beams represent a fire hazard. The NFPA states that for continuous wave lasers, 0.5 W cm^-2 is a possible ignition hazard. If flammable compounds or substances are present, it is possible that fires can be initiated by Class 3B lasers. The LSO should encourage the use of flame retardant materials around Class 3B and Class 4 lasers wherever applicable.

High-pressure arc lamps, filament lamps, and capacitor banks in laser equipment shall be contained in housings that can withstand the maximum explosive pressure. There have been reported incidents of explosions caused by the ignition of dust that had collected in ventilation systems serving laser processes. The potential for such explosions can be greatly reduced by good maintenance procedures.

The LSO should be familiar with NFPA Code 115 for further information on controlling laser-induced fires.

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