Porro Prisms
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
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| Materials: |
BK7, UVFS
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Surface Figure:
|
λ/10 at 633
nm, all polished surfaces
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Surface Quality:
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10-5, all polished surfaces
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| Dimensional Tolerance: |
+ 0.000", – 0.010" |
Angular Deviation:
|
180º |
| Bevels: |
0.010" – 0.030" at 45º
on input edge; minimum safety bevel on roof edges |
| Clear Aperture: |
Central 85% of diameter |
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Last Updated ( Wednesday, 02 May 2007 )
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