10
Version 4.2 rev 06 Oct 2020
8.2 x 8.2 mm / 512 x 512 sensor
Lowest Noise Imaging EMCCD
Mechelle
l
aser
c
lass
p
ractical
d
ifferences
The practical differences between the main classes are as follows as defined in IEC 60825-1 Annex C and Table F.2:
Class
Overview*
Eye
Diffuse
Reflections
Skin
Fire
Hazard Detail
†
1
Safe under
reasonably
foreseeable
conditions
Safe
Safe
Safe
Safe
Laser products that are safe during use,
including long-term direct intrabeam
viewing, even when exposure occurs while
using telescopic optics.
2
Low power;
eye protection
normally
afforded by
aversion
& active
responses
Safe mometarily,
due to natural
aversion
behaviour, i.e.
you will close
your eye lids and
look way
Safe
Safe
Safe
Laser products that emit visible radiation
that are safe for momentary exposures but
can be hazardous for deliberate staring into
the beam.
The time base of 0,25 s is inherent in the
definition of the class and presumption
is that there is very low risk of injury for
momentary exposures that are somewhat
longer.
3R
‡
Direct
intrabeam
viewing may
be hazardous
Not considered
intrinsically safe
Safe
Safe
Safe
Not considered intrinsically safe, the risk is
limited because
– unintentional exposures would rarely
reflect worst-case conditions of (e.g.)
beamalignment with a large pupil and
worst-case accommodation with the entire
beam energyentering the eye,
– of the inherent reduction factor (safety
margin) in the MPE,
– of natural aversion behaviour for exposure
to bright light for the case of visible
radiationand by the response to heating of
the cornea for far infrared radiation.The risk
of injury increases with exposure duration,
and exposure may be hazardous for ocular
exposure under worst-case conditions or
for intentional direct intrabeam viewing.
