K prisms rhombs generate a phase shift of a quarter wavelength based the phase difference between the s-polarized and the p-polarized component in total internal reflection. Similar to Fresnel rhombs Fresnel-Rhomben the path difference shows only a small variation with the wavelength and the prisms are useable over very broad spectral ranges.

K prisms do not introduce a beam displacement for light on the optical axis. Consequently, the beam position strays constant even if the application requires a rotation of the prism.

A K prism is assembled from two halves which are connected by optical contact. The contact line between the prisms is located at the center of the clear aperture. The edges of the prisms are not chamfered yielding a hardly visible contact line.

We manufacture K prisms from fused silica and from N-BK7. The prisms are delivered in a cylindrical holder and without antireflection coating.

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