Porro Prisms (PRP)
180° beam folding prism
Porro prisms are sections of a right angle prism. They are specifically intended for 180° folding. These Porro prisms are circular in cross section and have a λ / 10 polished input face. An incoming beam is totally internally reflected at the roof faces and returned in the opposite direction within 10 arc sec.
Material: |
BK7A
UV Fused Silica |
Surface Flatness: |
< λ / 10 @ 633 nm |
Surface Quality: |
<10 / 5 |
Dimension Tolerance: |
< + 0.00 / – 0.20 mm |
Angular Deviation |
<10 arc sec |
Clear Aperture: |
>85% in central circular dimension |
Bevel: |
0.3 mm (typical) x 45°
No bevel on the apex of the prism (sharp knife edge) |
Porro Prisms (PRP)