Penta Prism / PPB
Penta prisms deviate an input beam by 270 degrees (-90 degrees) independently of the angle of incidence on the first surface. They are therefore useful as precise right angle mirror
These penta prisms are Anti-Reflection coated on the entrance and exit faces as well as being coated with an aluminum coating and black paint on the internal reflection faces.
Common Specifications
| Material | BK7 |  |
|---|---|---|
| Surface Flatness of Substrate | λ/4 | |
| Angle Tolerance | ±3′ | |
| Surface Quality (Scratch-Dig) | 40 − 20 | |
| Coating | Aluminum coating + Black Paint MgF2Single-layer anti-reflection coating |
|
| Clear Aperture | Circle inscribed in a square of 90% of the dimensions A |
| Schematic | Outline Drawing |
|---|---|
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| Part Number | A | C |
|---|---|---|
| PPB-10-4 | 10mm | 10.8mm |
| PPB-15-4 | 15mm | 16.0mm |
| PPB-20-4 | 20mm | 23.0mm |
| PPB-25-4 | 25mm | 27.1mm |
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