The Fresnel Rhomb retarder offers unmatched performance in broad band, achromatic retardation.
These optics exploit the relative phase shift between orthogonal polarization states which occurs at the total internal reflection of a beam of light within a dielectric optic. Due to the large internal incidence angle required for this effect, these optics are very long and bulky.
The simplest design employs a single element. However, this means that the transmitted beam is strongly laterally displaced which can be very inconvenient – especially when the optic must be rotated. As an alternative, we offer dual elements which eliminate the lateral displacement. However, these items are even longer than the single elements.