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Corner Cube Prism

 Corner cube prism, aka Retro-reflectors, has three mutually perpendicular reflecting surfaces, like the corners of a cube. Light entering a retro-reflector is reflected back 180°, and parallel to the original beam, regardless of its orientation to the beam. This makes retro-reflectors valuable for applications requiring exactly 180° reflection without having to precisely orient the prism. The reflected images are both inverted and reversed. For its special characteristics, it is often used in the distance measurement, optical signal processing and laser applications.

Specifications:
Material: BK7 grade A optical glass
Dimension Tolerance: +0.0, -0.2mm
Clear Aperture: >85% of diametre
Deviation: 180deg 5 arc seconds
Flatness: λ/4 @632.8nm on big surface, λ/10 @632.8nm on other surface
Wavefront Distortion: λ/2 @632.8nm
Surface Quality: 60-40 scratch and dig
Bevel: 0.25mmx45deg