Porro Prisms operate on the principle of total internal reflection (TIR). A beam entering perpendicular to the entrance / exit surface is reflected by the two roof surfaces and emerges parallel to itself.
For applications in which either the acceptance angle for TIR is exceeded, or the reflecting surfaces cannot be kept sufficiently clean for TIR, a metal or dielectric coating can be applied to the reflecting surfaces.
RMI Standard Specifications
BK7, UVFS, FS
BK7, UVFS, FS:
All polished surfaces: λ/20 at 633 nm
Surface Quality: BK7, UVFS, FS:
All polished surfaces: 10-5
+ 0.000", – 0.010"
0.010" – 0.030" at 45º on input edge; minimum safety bevel on roof edges
The cornerstone of the RMI service philosophy is a collaborative approach with our customers to solve even the most technically challenging requirements. Working with clients in the early stages of development, we transition prototype concepts to efficient and manufacturable solutions.