High-risk lasers

Class 3B

Class 3B laser products are medium power devices for which direct ocular exposure is unsafe, but for which the diffuse reflection is safe under certain conditions (i.e. a minimum viewing distance of 130 mm and a maximum viewing time of 10 seconds). The beam also presents a minor skin hazard, especially when focused. For a CW laser in the visible or infrared wavelength range the Class 3B AEL is 500 mW.

Class 4

Class 4 laser products are high power devices for which even the diffuse reflection is generally hazardous. They may also cause skin burns and may present a fire hazard. There is no AEL for Class 4.


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