2.2.1.1 Class 2 (US: class II)
The accessible laser radiation of Class 2 (US: Class II) laser systems does not pose any hazard for
the skin. Diffuse reflections as well as any short-term irradiation of the eyes (exposure time
max. 0.25 sec) also pose no risk due to the low output power.
However, it is possible to suppress the natural eyelid closure reflex and stare into the class-2 beam for
a time long enough for the eyes to get injured.
2.2.1.2 Class 4 (US: class IV)
Class 4 (US: class IV) high powered lasers (visible or invisible) considered to present potential acute
hazard to the eye and skin for both direct and scatter (diffused) conditions.
Also have potential hazard considerations for fire (ignition) and byproduct emissions from target or
process materials. It is the responsibility of the operator of the machine to take appropriate
measurements to eliminate any dangers such as fire or explosions through the laser beam.
2.2.1.3 Precautions when dealing with a class 4 (US: class IV) laser machine
When dealing with class 4 (US: class IV) laser machine follow the following precautions:
- According to BGV B2 „Laser Emission“, a competent laser safety officer has to be appointed
in writing to evaluate potential hazards and to ensure that appropriate control measures are
implemented.
- The laser controlled area shall be posted with appropriate warning signs or warning lamps and
the area shall be defined to contain the laser radiation.
- The laser controlled area must be protected against unauthorized access.
- The operator of class 4 (US: class IV) laser systems always has to wear appropriate safety
glasses.
- An indicator (typically a light) to provide a warning of laser emission in advance of and during
the emission time.
Compliance with the points above does not absolve the operator from meeting the relevant standards
and guidelines for the operation of a class 4 (US: class IV) laser system.
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