Requirements from Regulations and Standards
FQ2-S4 User’s Manual
579
Appendices
12
Definitions of Laser Classification
For Europe
Laser Product Classifications
EN
Note:Conditions for safe viewing of diffuse reflections for Class 3B visible lasers are: minimum viewing distance of 13
cm between screen and cornea and a maximum viewing time of 10 s. Other viewing conditions require a comparison
of the diffuse reflection exposure with the MPE.
Class Description
Class 1 Laser that are safe under reasonably foreseeable conditions of operation, including the use of optical
instruments for intrabeam viewing.
Class 1M Laser emitting in the wavelength range from 302.5 nm to 4000 nm which are safe under reasonably fore-
seeable conditions of operation, but may be hazardous if the user employs optics within the beam.
Class 2 Laser that emit visible radiation in the wavelength range from 400 nm to 700 nm where eye protection is
normally afforded by aversion responses, including the blink reflex. This reaction may be expected to
provide adequate protection under reasonably foreseeable conditions of operation including the use of
optical instruments for intrabeam viewing.
Class 2M Laser that emit visible radiation in the wavelength range from 400 nm to 700 nm where eye protection is
normally afforded by aversion responses, including the blink reflex. However, viewing of the output may
be more hazardous if the user employs optics within the beam.
Class 3R Laser that emit in the wavelength range from 302.5 nm to 10
6
nm where direct intrabeam viewing is
potentially hazardous but the risk is lower than for Class 3B lasers, and fewer manufacturing require-
ments and control measures for the user apply than for Class 3B lasers. The accessible emission limit is
within five times the AEL of Class 2 in the wavelength range from 400 nm to 700 nm and within five
times the AEL of Class 1 for other wavelengths.
Class 3B Lasers that are normally hazardous when direct intrabeam exposure occurs (i.e. within the
NOHD). Viewing diffuse reflections is normally safe (see also note).
Class 4 Lasers which are also capable of producing hazardous diffuse reflections. They may cause
skin injuries and could also constitute a fire hazard. Their use requires extreme caution.
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