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The Rochon polarizers consist of two identically shaped prisms made from birefringent magnesium fluoride (MgF2). The crystal axis is parallel to the propagation direction in one prism and orthogonal to it in the other one. Therefore, the extraordinary beam gets refracted on the passage while the ordinary beam passes without deviation at all wavelengths. For this reason Rochon polarizers are particularly suited in application requiring a rotating polarizer. The polarization of the ordinary beam is parallel to the plane of splitting.
We provide the prisms by default with a cylindrical holder and without antireflection coating. The holders are entirely free of cement which makes them suited for vacuum conditions.p>
We offer Rochon polarizers with three different splitting angles. The version with a splitting angle of 0,5° is assembled with air gap between the prisms. This version suited for high laser powers in the UV as well as for application involving increased thermal loads. The inner surfaces are cut at Brewster angle which minimizes reflective losses of the ordinary beam on these surfaces.
For the versions with splitting angles of 2,5° and 4° the required cut angles are larger and would imply total internal reflection on an air gap. Therefore, the prisms are joined by cementless optical contact.
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