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Right Angle Prisms |
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Right Angle Prisms
Right Angle Prisms are well suited for beam
deviation and retro-reflection. They are often preferable to plane mirrors,
because they are easier to mount and align. High throughput is attained
when the hypotenuse is used in total internal reflection (TIR), and
the entrance and exit surfaces are anti-reflection coated. An incident
beam normal to the entrance surface is reflected at a 90° angle. Images
are inverted as illustrated in the drawing below.
The hypotenuse may also be used in external reflection, in which case
it is coated with a metal or dielectric, high reflectance coating. Right
angle prisms may also be used for retro-reflection. A beam entering
perpendicular to the hypotenuse is reflected by the legs and emerges
parallel to itself. If it is desirable to use either the hypotenuse
or the legs in internal reflection mode, but field angle requirements
exceed TIR acceptance limits, or if the environment in which the prism
is to be used does not allow the hypotenuse to be kept sufficiently
clean for TIR, a metal or dielectric coating can be applied to the hypotenuse.
RMI STANDARD
SPECIFICATIONS
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| Materials: |
BK7, UVFS |
Surface Figure:
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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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| Dimensions: |
A=B=C |
| Dimensional Tolerance: |
+ 0.000", – 0.010" |
Angular Deviation:
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≤ 3 arc minutes |
| Bevels: |
0.010" – 0.030" at 45º |
| Clear Aperture: |
Central 85% of diameter |
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Last Updated ( Wednesday, 02 May 2007 )
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Due to their potential strategic high value, export of RMI products and related technical data may be subject to U.S. or other export licensing requirements.
Please consult your export control administrator or contact RMI for more information.
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