Right Angle Prism
An optical right angle prism has a 45°-45°-90° triangular cross section and operates by total internal reflection. Typically made from optical glass such as N-BK7 or UV fused silica (UVFS), it can deflect an incident beam through 90° or 180° while changing image orientation or producing a mirror image. It is widely used to fold optical paths in laser, imaging and spectroscopy systems. Its three optical surfaces comprise two perpendicular faces for light entry and exit and a hypotenuse reflecting face. An uncoated hypotenuse relies on total internal reflection (TIR), with approximately 100% reflectance, no chromatic aberration and no absorption. Aluminum, silver, gold or dielectric high reflection coatings on the hypotenuse provide external reflection and can also produce an external 90° deflection. The perpendicular faces commonly have visible or broadband antireflection coatings to reduce surface losses. In the usual 90° configuration, light enters normally through one perpendicular face, strikes the hypotenuse at 45°, above the critical angle, and undergoes total internal reflection before leaving normally through the other face. In the 180° retroreflection configuration, light enters normally through the hypotenuse, reflects once from each perpendicular face and returns in the opposite direction, providing a low cost alternative to a corner cube prism. In the 90° mode, the left/right orientation is retained while the image is inverted vertically; in the 180° mode, the vertical orientation is retained while left and right are reversed. The TIR version requires no reflective coating, provides nearly 100% reflectance and covers a very broad UV to IR band. Compared with a flat mirror, it has less demanding angular tolerances and a larger mechanical contact area for simple, vibration resistant mounting. A single reflection produces a 90° turn and substantially reduces system volume, making it widely used for folded optical paths.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | H-K9L |
| Size | Diameter 40*16*16mm（ Customizable ） |
| angle tolerance | ＜1′ |
| Surface Figure Accuracy | λ/4 |
| Clear Aperture | ＞95% |
| S1 | 790-890nm@T＞99%,AOI＝0±5° |
| Surface Treatment Requirements | S2/S3 Surface Is a Total Internal Reflection Surface ， Uncoated ，S1/S5 Surface Is Frosted |
Applications
Datasheet
Supplier Information
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