A penta prism is a five-sided glass block with four active surfaces, two of which are mirror coated used to define right angles in optical system.
A penta prism is a five-sided glass block with four active surfaces, two of which are mirror coated used to define right angles in optical system. It employs reflection off two surfaces to deviate a light beam by 90° while preserving image parity. In imaging applications the penta prism will neither invert nor reverse the image. This prism deviates a beam through the same angle regardless of its orientation to the beam. Aluminum, silver, and gold mirror coatings with protective epoxy paint overcoats are commonly applied to the two reflecting faces of the penta prism.
Penta Prisms are offered by Photon Optical mounted or unmounted, or in N-BK7 or UV Fused Silica Substrates. C-Mounted Penta Prisms are ideal for easy integration into C-Mount systems. These Prisms are mounted in black, anodized aluminum housings with two female C-Mount apertures.
Standard Specs
Substrate | N-BK7 or UV Fused Silica or other optical glass upon request |
Size | 4mm to 300mm |
Dimensional Tolerances | ±0.05
|
90°Deviation Tolerance | 10 arc seconds |
Clear Aperture | up to 90% |
Flatness | λ/2(Standard),λ/8(High Precision)@633nm over the clear aperture |
Surface Quality | 40-20 |
Chamfer | 0.25-0.5 mm face width x 45° ± 15° |
Coating | Upon request |
