|
Class
|
Description
|
| I |
Very low risk, “safe under reasonable foreseeable use” |
| I M |
Wavelengths between 302.5 nm and 400.0 nm are safe except when used with optical aids (e.g. binoculars). |
| II |
Wavelengths between 400 nm and 700 nm. No known hazard with 0.25 seconds (aversion response). |
| II M |
No known hazard with 0.25 seconds (aversion response) unless collecting optics are used. |
| III R |
Direct intrabeam viewing is potentially hazardous but the risk is lower than Class III B lasers. |
| III B |
Normally hazardous under direct beam viewing conditions, but are normally safe when viewing diffuse reflections. |
| IV |
Hazardous under both intra beam and diffuse reflection viewing conditions. They may also cause skin injuries and are potential fire hazards. |
