6
1.
International Standard IEC 60825-1 (2001-08) Consolidated edition
, Safety of
laser products – Part 1: Equipment classification, requirements and user’s guide
2.
Technical Report TR 60825-10
, safety of laser products – Part 10. Application
guidelines and explanatory notes to IEC 60825-1
3.
Laser Notice No. 50
, FDA and CDRH
http://www.fda.gov/cdrh/rad-health.html
1.2 Laser Classification
1.2.1 Laser Classes
Class 2/ll laser products:
Class 2/ll laser products would not cause
permanent damage to the eye under
reasonably
foreseeable
conditions
of
operation, provided that any exposure can
be terminated by the blink reflex (assumed to take
0.25 sec). Because classification assumes the
blink reflex, the wavelength of light must be in the
visible range (400 nm to 700 nm). The Maximum
Permissible Exposure (MPE) for visible radiation
for 0.25 second is 25 Watt per square meter,
which is equivalent to 1 mW entering an aperture
of 7 mm diameter (the assumed size of the pupil).
Class 3R/llla laser products:
Class 3R/llla laser products emit radiation where
direct intrabeam viewing is potentially hazardous,
but the risk is lower than for 3B/lllb lasers. Fewer
manufacturing
requirements
and
control
measures for users apply than for 3B/lllb lasers.
Class 3B/lllb laser components:
Class 3B/lllb components are unsafe for eye
exposure. Usually only ocular protection would
be required. Diffuse reflections are safe if viewed
for less than 10 seconds.
Labels reprinted here are
examples relevant to the laser
classes. For detailed
specifications observe the label
on your laser sensor