Penta Prisms
Penta prisms deviate an input beam by 270 degree (-90 degree) independently of the angle of incidence on the first surface. They are therefore useful as precise right angle mirrors which are insensitive to alignment.
These penta prisms find many metrological applications. These penta prisms are Anti-Reflection coated on the entrance and exit faces as well as being coated with protected aluminum and black paint on the internal reflection faces.
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| Sides a = b (mm) | Material | Surface Flatness | Surface Quality | Coating | Dimension tolerance | Angle deviation | Clear Aperture | Bevel |
|---|---|---|---|---|---|---|---|---|
| 10.0 | BK7 | λ/4 | 40 - 20 | BMAR 425-675, Protected Alum Black Paint | ±0.2mm | ±3arcmin | 90% | 0.2mm to 0.3mm x 45° typical |
| 10.0 | BK7 | λ/4 | 40 - 20 | None | ±0.2mm | ±3arcmin | 90% | 0.2mm to 0.3mm x 45° typical |
| 15.0 | BK7 | λ/4 | 40 - 20 | BMAR 425-675, Protected Alum Black Paint | ±0.2mm | ±3arcmin | 90% | 0.2mm to 0.3mm x 45° typical |
| 15.0 | BK7 | λ/4 | 40 - 20 | None | ±0.2mm | ±3arcmin | 90% | 0.2mm to 0.3mm x 45° typical |
| 20.0 | BK7 | λ/4 | 40 - 20 | BMAR 425-675, Protected Alum Black Paint | ±0.2mm | ±3arcmin | 90% | 0.2mm to 0.3mm x 45° typical |
| 20.0 | BK7 | λ/4 | 40 - 20 | None | ±0.2mm | ±3arcmin | 90% | 0.2mm to 0.3mm x 45° typical |
| 25.0 | BK7 | λ/4 | 40 - 20 | BMAR 425-675, Protected Alum Black Paint | ±0.2mm | ±3arcmin | 90% | 0.2mm to 0.3mm x 45° typical |
| 25.0 | BK7 | λ/4 | 40 - 20 | None | ±0.2mm | ±3arcmin | 90% | 0.2mm to 0.3mm x 45° typical |