11
Version 4.2 rev 06 Oct 2020
8.2 x 8.2 mm / 512 x 512 sensor
Lowest Noise Imaging EMCCD
Mechelle
Class
Overview*
Eye
Diffuse
Reflections
Skin
Fire
Hazard Detail
†
3B
Direct intrabeam
viewing
normally
hazardous, i.e.
direct viewing of
beam with eye
Hazardous
Normally safe
Lasers which
approach
the Class
3B AEL may
produce minor
skin injuries.
However, this
is only likely
if the beam
has a small
diameter or is
focussed.
Risk of igniting
flammable
materials for
same lasers
mentioned under
“Skin”
Laser products that are normally hazardous
when intrabeam ocular exposure occurs
(i.e. within the NOHD) including accidental
short time exposure
4
High power;
diffuse
reflections may
be hazardous
Hazardous
May be
hazardous
Hazardous
Often represent
a fire hazard
Everything above Class 3B
* See IEC 60825-1 Table F.2
†
See IEC 60825-1 Annex C
‡
CDRH Class IIIa is almost identical to Class 3R and 21CFR § 1040.10 (b) (8) describes the hazard as “depending upon the
irradiance, either an acute intrabeam viewing hazard or chronic viewing hazard, and an acute viewing hazard if viewed directly with
optical instruments”.
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.
