90 Degree Prism Right Angle Prism For Periscopes And Viewfinders

A 90 degree prism, also known as a right-angle prism, is a triangular optical prism with two 90-degree internal angles. It is a versatile optical component for manipulating light beams and visual images. Its ability to internally reflect light at a 90° angle and flip images makes it a valuable building block in many optical instruments and systems.

 

Our premium 90-degree prism, a pinnacle of optical precision and performance, machined from a solid block of the highest refractive index glass, is individually inspected to ensure flawless quality and the utmost dimensional accuracy at a tolerance of 1 arc second. It is an engineering masterpiece that reflects and redirects light at a perfect right angle with nearly 100% efficiency. Each prism is manually polished with unsurpassed care using state-of-the-art techniques to achieve parallel and transparent faces. This results in superior clarity as light propagates with minimal loss or distortion. Please send us an inquiry if you want to get more detailed information.

 

Features

- High angular accuracy

- Sophiscated craftsmanship

- High surface quality

- High stability

- High-quality prism material

 

Parameters

Product name	90-degree prism/right-angle prism
Material	H-K9L or custom
Surface quality	40/20 scratch-dig
Size	100mm or custom
Dimension tolerance	+/- 0.05 to 0.1mm
Flatness tolerance	1/4 λ or custom
Coating	AR or custom
Clear aperture	>90%

 

Spectrum transmission curve

 

Applications

90-degree prisms have essential applications in reflective optics, beam manipulation, image rotation, calibration standards, and other areas that utilize precise 90-degree and total internal reflection. They provide a cost-effective solution for accurately turning the direction of a light path through a 90-degree angle.

- Periscopes and viewfinders

- Reflective prism assemblies

- Beam steering

- Corner reflectors

- Optical rotation

- Light traps

- Beam splitters

- Optical calibration

 

What is an optical prism?

An optical prism is a transparent optical element with flat, polished surfaces that refract or reflect light. Prisms are used to deviate, displace, invert, split, or attenuate light beams. They utilize the refractive properties of the glass or other substrate material to control the path of light precisely.

 

The main types of optical prisms include:

• Refracting prisms: Deviate or displace the light path using refraction at multiple surfaces. Examples are wedge prisms, penta prisms, 90 degree prisms/right angle prisms and dove prisms.

• Reflecting prisms: Use total internal reflection to reflect the light path. Examples are right-angle prisms and corner reflector prisms.

• Roof prisms: Invert and deviate the light path using a combination of refraction and reflection. Used in periscopes and optical instruments.

• Beam splitting prisms: Use partially reflecting surfaces to split a single light beam into two separate beams. Used for applications like interferometry.

• Dispersing prisms: Separate white light into the color spectrum using the wavelength dependence of refraction. Used in monochromators and spectrographs.

 

The main properties of an optical prism include:

• Apex angle: The internal angle between the two refracting or reflecting surfaces. Determines how much the prism deviates light.

• Refractive index: The ratio of the speed of light in a vacuum to the speed of light in the prism material. It affects the amount of deviation.

• Dispersion: The variation in refractive index with wavelength. It causes white light to disperse into the color spectrum.

• Surface quality: Smoothness of the polished surfaces. It affects loss, scattering, and wavefront distortion.

• Parallelism: How parallel the refracting or reflecting surfaces are. Important for image quality and collimation.

• Transmittance: The total amount of light transmitted through the prism. The loss depends on surface quality, coatings, and reflections.

• Other factors: Size, shape, coatings, durability, precision, mounting, etc. Depend on the intended application.

 

Prisms are essential in various optical instruments and applications, including spectroscopy, microscopy, surveying, imaging, laser processing, metrology, and astronomy. Their ability to precisely control the path and properties of light beams without significantly disturbing wavefront quality gives them a unique purpose in optics.

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