Prisms & Beam Splitters

prisms and beam splitters

Prisms are used to manipulate a beam or image in an optical system. The number of polished surfaces and the angle displacement between them are system dependent. Used to reflect or refract light at precise angles, our prisms and beam splitters are made from any optical glass, filter glass or fused silica and can be coated to your exact specifications.

Optical Prism
beam splitter
Cube Beam Splitter


Optical Glass • Fused Silica • Filter Glass • Float Glass


4mm – 150mm


Dimensional Tolerances Commercial Precision Max Capability
Diameter (mm) +/- 0.10 +/- 0.025 +/- 0.015*
Center Thickness (mm) +/- 0.10 to 0.20 +/- 0.10 to 0.05 +/- 0.025
Surface Tolerances Commercial Precision Max Capability
Surface Quality (scratch-dig) 80 – 50 to 60 - 40 40 - 20 20 - 10 to 10 – 5
Surface Roughness (ARMS) > 50 20 < 10
Surface Irregularity (Fringes, P-V @ 633nm) >2 1/2 to 1 1/5
Surface Power (Fringes, P-V @ 633nm) 10 3 to 5 1
Centration (Ray deviation) 5+ min. 2 – 3 min. 10 sec.
* material and size dependent

After a quote is generated by one of the Manufacturing Engineers for the particular prism or beam splitter, near net shape optical glass blanks are ordered and sent to the production line. The blank will be blocked to a tool and sent to generation, where it will be ground into a closer shape. After generation comes fine grinding, which includes grinding the prisms more precisely to reach the order's specifications. Finally, the optical prism will be polished on all desired surfaces. The prisms will either be sent out to the customer or retained in the facilities for further treatment with processes such as custom coatings and truncations. For a beam splitter, two prisms follow the outline above, are coated, matched together, then cemented.


We have extensive in-house coating capabilities to meet your requirements. See our coating capabilities.

Uses for Prisms & Beam Splitters
Binoculars Microscopy Multi-spectral imaging
Telescopes LASIK devices Machine vision
Ophthalmology Threat detection Laser target designators