Corner Cube Prism

Corner Cube Reflector (rangefinder)( CCR or trihedral prism)
 

A corner cube retroreflector, also known as a CCR or trihedral prism, is an optical structure that consists of three adjacent, mutually-orthogonal plane-reflecting surfaces which form the corner of a cube. The corner cube reflects an incident ray at a specific angle, independent of the prism and beam orientations.

Typical corner cube designs reflect the incident light at 180 degrees. Some applications require the reflected ray to return at a different angle.

A number of coating options are available for corner cube retroreflectors. The front face may have an antireflective (AR) coating applied, and the three reflecting faces may have a metallic or dielectric coating, or may remain uncoated.

Corner cubes are used in a wide variety of applications such as spectroscopy, battlefield technology laser resonator cavities, land surveying, ground based range-finding, satellite communications and space vehicle docking