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

triple mirror

Also known as corner-cube reflector or retrodirective reflector. Three reflecting surfaces, perpendicular to each other, that are arranged like the inside corner of a cube. As the triple mirror has a constant deviation of 180° for all angles of incidence, a ray of light incident on it from any angle is reflected parallel to itself.
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