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Right Angle Prism

  • Introduction

Right Angle Prism

Right angle prisms turn light through 90° by internal reflection from the hypotenuse, or 180° from two right angle surfaces. When the light incident angle is perpendicular to the right angle surfaces, the light will be reflected at the surface of glass/air interface.

When the input light is incident from hypotenuse surface, the light will be fully reflected in the glass / air interface at the right angle surfaces. The second total reflection occurs at next right angle surface.

Compared to regular reflective mirrors, right angle prisms are easily to be mounted; further its reliable mechanical stress has better stability and strength. Hence right angle prisms have been considered as suitable alternatives to reflective mirrors in various applications.

Hyperion Optics supplies a range of right angle prisms to meet UV-Visible-NIR applications, with high surface quality and tight tolerance angles.  Our materials selection ranges from BK7, Bak4, fused silica, ZnSe, CaF2 etc.

Material tips for your application:

  • For working wavelength down to 175nm or so, with low thermal expansion requirement, Fused silica is the right choice with tighter tolerance control due to its excellent mechanical stability.
  • For visible and NIR wavelength, N-BK7 or CDGM H-K9L is suitable and cost effective.
  • For infrared wavelength, ZnSe and germanium are the right material to pick up.
  • Calcium fluoride has relatively wide transmittance range from 0.18~8um, it is the best choice when your application covers such wide transmission range.

Hyperion Optics has full capability of processing right angle prisms based on the materials we proposed above with 3 precision levels fit your actual demand.

Right Angle Prism




Dimension Tolerance(mm)




Angle Tolerance








Flatness  @632.8 nm

2 Lambda

1/2 Lambda

1/10 Lambda

Coating (T% avg) VIS




Coating (R% avg) VIS





BK7, Bak4, fused silica, ZnSe,Ge,CaF2

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