Micro Light-guide Prism Micro light-guide prism are shaped from a truncated right-angle prism. A beam of light entering one of the sloped faces of the prism undergoes total internal reflection from the inside of the longest (bottom) face and emerges from the opposite sloped face. Images passing through the prism are flipped, and because only one reflection takes place, the image's handedness is changed to the opposite sense. Dove prisms have an interesting property - when they are rotated along their longitudinal axis, the transmitted image rotates at twice the rate of the prism. It is very important that the application must be used with parallel or collimated beam and the large square reflective surface should be kept very clean. Another application is used as a retroreflector. For this application it performs as a right-angle prism.   Used in Interferometry, Astronomy and Pattern Recognition. General Parameters ( mini prisms )    Standard High Pricision   Material N-BK7, Fused Silica, Custom   Size 0.5mm, 5mm to 380mm   Size tolerance ±0.1mm ±0.03mm   Angle Tolerance <3' <0.5''   Clear Aperture ≥90% 100%   Surface Quality 60/40, 40/20 20/10, 10/5   Surface Flatness 1/2 lambda, 1/4lambda 1/10Lambda, 1/20Lambda   Parallelism +/-3' , +/-30'' <0.5''   Bevel <0.2mm±45° No Bevel (The Angle is unbroken)   Coating Uncoated, AR, BBAR, Reflective