Right angle prism

Right Angle Prisms

Right angle prisms (RAP) are widely used for rotating image and redirecting the input light. They serve as a mirror to deviate light through 90 degrees and also as a retro-reflector to deflect light through 180 degrees by total internal reflection. They are the main components for polarizing and non-polarizing cube beamsplitters.

The total internal reflection (TIR) in the right angle prisms with specific anti-reflection (AR) coatings on the two leg sides make themselves the perfect alternatives of 45 degree mirrors.


Photonchina Laser Grade Right-Angle Prisms are fabricated by special selection optical materials with low scatter and absorption. Standard size laser grade right angle prisms, with better surface finish, flatness as high as l/10 and high accuracy are available in Photonchina.



Attribute Standard Level Photonchina’s Ability
Material BK7, Fused Silica BK7, Fused Silica
Dimension Tolerance +0.0, -0.2mm +0.0, -0.2mm
Clear Aperture >85% >85%
Angle Tolerance ≥ ±30″ ±5″
Flatness Per 25.4mm λ/4@632.8nm Per 25.4mm λ/10@632.8nm
Surface Quality 60-40 scratch and dig 10-5 scratch and dig
Protective Bevel (0.2-0.5) X 45° mm (0.05-0.2) X 45° mm