USER’S SAFETY PROTECTION MEASURES ACCORDING TO IEC60825-
1:1993+A1:1997+A2:2001 “LASER PRODUCT RADIATION SAFETY STANDARD”
I.
SAFETY GUIDE
I .
4 - 6
Page
10.7
Specular reflections
Care should be exercised to prevent the unintentional specular reflection of radiation from Class 3R, Class 3B
or Class 4 laser products. Mirrors, lenses and beam splitters should be rigidly mounted and should be subject to
only controlled movements while the laser is emitting.
Care should be exercised to prevent the unintentional specular reflection of radiation from Class 1M and Class
2M laser products from surfaces that may focus the beam.
Reflecting surfaces that appear to be diffuse may actually reflect a considerable part of the radiation beam
specularly, especially in the infra-red spectral range. This may be potentially hazardous for longer distances
than one would expect for purely (Lambertian) diffuse reflections.
Special care needs to be taken in the selection of optical components for Class 3B and Class 4 lasers and in
maintaining the cleanliness of their surfaces.
Potentially hazardous specular reflections occur at all surfaces of transmissive optical components such as
lenses, prisms, windows and beam splitters.
Potentially hazardous radiation can also be transmitted through some reflective optical components such as
mirrors (for example, infra-red radiation passing through a reflector of visible radiation).
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