Penta Prism / Half Penta Prism
Description
The penta prism employs reflection off two surfaces to deviate a light beam by 90° while preserving image parity. The beam deviation is invariant to slight rotation of the prism, making it useful for applications where critical alignment is necessary. Alternate prism configurations include the roof penta, which reverses the parity of the image, and the half-penta, which deviates light by 45°. Penta prisms are commonly used in image erecting assemblies and as laser insertion prisms for advanced surveillance and range-finding applications. Aluminum, silver, and gold mirror coatings with protective epoxy paint overcoats are commonly applied to the two reflecting faces of the penta prism. Alternatively, the 22.5° incident angle upon the reflecting faces is ideal for dielectric high reflective mirrors and dichroic beamsplitter coatings that operate over wide cone angles.
Penta Prism / Half Penta Prism
Specifications |
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|---|---|
| Material: | BK7, FS |
| Dimension (A): | 3 mm |
| Dimension (B): | 200 mm |
| Mounting: | Unmounted |
Applications
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Frequently Asked Questions
A penta prism is an optical prism that deviates a light beam by 90° while preserving image parity.
The alternate prism configurations of a penta prism include the roof penta, which reverses the parity of the image, and the half-penta, which deviates light by 45°.
Penta prisms are commonly used in image erecting assemblies and as laser insertion prisms for advanced surveillance and range-finding applications.
The typical specifications of a penta prism include material, sizes, dimensional tolerances, clear aperture types and sizes, surface quality, roof-edge chips, bevels, surface flatness, transmitted wavefront, beam deviation, and coatings.
Aluminum, silver, and gold mirror coatings with protective epoxy paint overcoats are commonly applied to the two reflecting faces of the penta prism. Alternatively, the 22.5° incident angle upon the reflecting faces is ideal for dielectric high reflective mirrors and dichroic beamsplitter coatings that operate over wide cone angles.