Polarizing Beamsplitter Cubes

Two right angle prisms made of flint glass are cemented together to form a cube.
In the wavelength range of 440 to 650 nm the dielectric beamsplitter coating provides 97 - 98% transmission for the component polarized parallel to the plane of incidence. Less than 0.04% of radiation polarized vertically to the plane of incidence is contained in the transmitted light. Reflectivity is 99.9% for the 90° deviated component polarized perpendicular to the plane of incidence. The reflected light contains 2-3% radiation polarized parallel to the plane of incidence.
The surface accuracies of the right angle prisms are λ/10; the deformation of a transmitted wave is dependent of the homogeneity of the glass and often meets the quality of the surfaces. The deviation of a transmitted beam is less than 2'.
The outer faces of the cubes are multilayer antireflection coated; minimum residual reflectance approx. 0.3% per surface.

Holders

Cylindrical mounts are available for beamsplitters of sizes between 10 mm and 25 mm.

Available on special order

• Other wavelength ranges or single wavelengths → on request
• Cubes made from glass with refractive index matching that of the cement. Hereby reflections between glass and cement (which might introduce disturbing interferences) are avoided → on request
• Cubes assembled without cement (cube pairs in optical contact) → on request
• Other geometries - i.e., for two parallel emerging beams or multiple beamsplitting combinations. → on request
• According to your demands λ/4 or λ/2 retardation plates for influencing the polarization can be cemented on the exit face. → on request