Dove prism

Dove Prisms


MaterialBK7, UVFS
Dimension Tolerance+0.0, -0.2 mm
Angle Tolerance<3 arcmin
Surface Flatness<λ/2 @ 632.8 nm
Surface Quality60-40 scratch & dig
Clear Aperture>80%
Uncoated Dove prisms are mainly used for image rotation in optical systems, which can rotate the image 180 degrees; coated Dove prisms are mainly coated with aluminum reflective film on the reflective side and transmission-enhancing film on the incident side, and are used in imaging systems.

Dove prism is a type of reflective prism which is used to invert an image. Dove prisms are shaped from a truncated right-angle prism. A beam of light entering one of the sloped faces of the prism undergoes total internal reflection from the inside of the longest (bottom) face and emerges from the opposite sloped face. Images passing through the prism are flipped, and because only one reflection takes place, the image's handedness is changed to the opposite sense. Dove prisms have an interesting property that when they are rotated along their longitudinal axis, the transmitted image rotates at twice the rate of the prism. It is very important that the application must be used with parallel or collimated beam and the large square reflective surface should be kept very clean. Another application is used as a retroreflector. For this application it performs as a right-angle prism.

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