Mosaic3
14
Version 3.5 rev 8 May 2019
c
Lass
3b
This laser radiation can damage your eye, but will not normally damage your skin, and will be identified as follows:
WARNING – CLASS 3B LASER RADIATION – AVOID EXPOSURE TO BEAM
These are defined by IEC 60825-1 Annex C.2 as “laser products that are normally hazardous when intrabeam ocular
exposure occurs (i.e. within the NOHD) including accidental short time exposure. Viewing diffuse reflections is normally
safe. Class 3B lasers which approach the AEL for Class 3B may produce minor skin injuries or even pose a risk of
igniting flammable materials. However, this is only likely if the beam has a small diameter or is focused.”
“Note: There exist some theoretical (but rare) viewing conditions where viewing a diffuse reflection could exceed the
Maximum Permitted Exposure (MPE). For example, for Class 3B lasers having powers approaching the AEL, lengthy
viewing of greater than 10 sec. of true diffuse reflections of visible radiation and viewing at distances less than 13 cm
between the diffusing surface and the cornea can exceed the MPE.”
The following terms are defined as follows:
•
Intrabeam ocular exposure
: Getting your eye in the way of a laser beam
•
Nominal Ocular Hazard Distance (NOHD)
: Distance from the output aperture beyond which the beam
irradiance or radiant exposure remains below the appropriate corneal maximum permissible exposure (MPE)
•
Accessible Emission Limit (AEL)
: Maximum accessible emission permitted within a particular class, i.e. the
limit at which one class transitions into another
•
Maximum Permissible Exposure (MPE)
: Level of laser radiation to which, under normal circumstances,
persons may be exposed without suffering adverse effects.
c
Lass
4
This laser radiation can damage both your eye and your skin, and potentially could cause deeper injuries, and will be
identified as follows:
DANGER − CLASS 4 LASER RADIATION − AVOID EYE OR SKIN EXPOSURE TO DIRECT OR SCATTERED RADIATION
These are defined by IEC 60825-1 Annex C.2 as “laser products for which intrabeam viewing and skin exposure is
hazardous and for which the viewing of diffuse reflections may be hazardous. These lasers also often represent a fire
hazard.”
