Penta Prism

Penta prisms allow precise deviation of the line of sight or input beam by 90° (±30 arcsecond accuracy). In imaging applications, penta prisms do not invert or reverse the image. These prisms deflect the beam by the same angle, regardless of its orientation relative to the beam. Penta prisms are especially valuable for applications that require precise 90° offsets without the need for precise orientation of the prisms. Due to their monolithic design, penta prisms are more stable than systems consisting of two mirrors.

Penta prisms cannot achieve total internal reflection based on the critical angle principle. Therefore, the two reflective surfaces of this prism are generally coated with aluminum film and black paint, and the incident surface and the outgoing surface are coated with MgF2 single anti-reflection coating.

Custom Penta Prism

Oplens supply high quality custom Penta prism made to our design or to your custom specification. Every component is individually tested by our highly skilled technicians using our Prism Master capable of 3 arc seconds accuracy to ensure all components meet our high quality standards. Penta prisms may also be bonded to wedges prisms or other components to create optical subassemblies. Please visit our custom capabilities pages for more information.