Direct intrabeam viewing may be hazardous (low eye hazard level), in par-
ticular for deliberate ocular exposure. The beam may cause dazzle, flash-
blindness and after-images, particularly under low ambient light conditions.
The risk of injury for laser class 3R products is limited because of:
a
)
unintentional exposure would rarely reflect worst case conditions of
(e.g.) beam alignment with the pupil, worst case accommodation,
b
)
inherent safety margin in the maximum permissible exposure to laser
radiation (MPE)
c
)
natural aversion behaviour for exposure to bright light for the case of
visible radiation.
Red laser specifications
Description
Value
Wavelength
635 nm
Maximum average radiant power
<5.0 mW cw
Beam divergence
0.06 mrad
NOHD (Nominal Ocular Hazard Distance) @
0.25 s
110 m
Safety Directions
28
