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Laser Radiation
Laser radiation can pose a risk to eyes and skin. The danger is not only
posed by direct laser radiation, but also by scattered radiation and
reflections from the work piece or the packaging machine. The degree
of injury depends on the duration of the effect, the power and the
wavelength of the laser.
Lasers and their installations are classified into seven laser protection
classes, depending on their potential danger. Class 1 is the safest and
Class 4 is potentially the most harmful. These classes are defined in
detail in EN60825 Part 1 and are summarised below:
Class 1 The accessible laser radiation may be visible or invisible
and is harmless.
Class 1M The accessible laser radiation may be visible or invisible
and is harmless, provided additional optical instruments
are not used.
Class 2 The accessible laser radiation is visible and is harmless
for accidental exposure to eyes for periods of less than
0.25 seconds.
Class 2M The accessible laser radiation is visible and is harmless
for accidental exposure to eyes for periods of less than
0.25 seconds, provided additional optical instruments
are not used.
Class 3R The accessible laser radiation may be visible or invisible.
It is potentially harmful to eyes.
Class 3B The accessible laser radiation may be visible or invisible.
Direct radiation is harmful to the eyes and skin although
diffuse radiation (reflected from a matt surface) is
harmless.
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