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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

lambertian surface

A perfectly diffusing surface; the intensity of the light emanating in a given direction from any small surface component is proportional to the cosine of the angle of the normal to the surface. The brightness (luminance, radiance) of a lambertian surface is constant regardless of the angle from which it is viewed.
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