Roof Prism

Roof prisms are precision optical components engineered to rotate, invert images, and deflect light paths by 90°. Ideal for telescope eyepieces and a wide range of optical instruments, these prisms excel at flipping the inverted image from the objective lens, correcting it to an upright orientation, and bending the light path by 90°—all while maintaining accurate visual direction for the observer.

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Material	Optical Glass, Fused Silica, Sapphire, Infrared Material, etc.
Dimensional tolerances	+/-0.01, or +/-0.1mm
Surface Flatness	λ/10~1λ
Parallelism	< 30 arc seconds, <2 arc min
Surface Quality	10/5,20/10,40/20
Edge Chip	<0.1mm
Bevel	Protective bevel, or based on clients’ requests
Clear Aperture	>90%
Coating	According to customer's request

Roof prisms owe their unique functionality to the presence of a roof surface—a core feature that defines their optical performance. This so-called roof surface is a roof-shaped reflective structure formed by two intersecting reflective surfaces within the light path. The edge where these two surfaces meet is positioned at the center of the light path, which is why some roof prisms exhibit a visible dividing line in the middle. This phenomenon arises from the prism splitting the light beam into two halves, then precisely splicing them back together to achieve image adjustment.

The reflective surfaces of roof prisms typically leverage total internal reflection for light redirection. However, optional optical coatings can be applied to expand the prism’s operating angle range, enhancing adaptability in diverse optical systems. For roof prisms, the 90° angle between the two roof surfaces must be precisely calibrated to strict tolerances; any deviation from the exact 90° angle will directly degrade image clarity and overall optical quality.

Custom Roof Prism Solutions by AOS Optics

AOS Optics specializes in custom roof prisms, offering a range of high-quality optical materials to match diverse application needs. A key material option is UV Fused Silica, specifically tailored for ultraviolet (UV) optical scenarios—ideal for precision UV-based systems.

Our custom roof prisms are engineered to meet strict dimensional and performance tolerances. We also provide optional coating solutions (aligned with the prism’s reflective surface requirements) to further optimize functionality, perfectly adapting to your unique optical setup.

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