Polarization-Insensitive Beamsplitter Components
Raw Material Properties
Laser grade ZnSe is used in the fabrication of polarization- insensitive beamsplitters.
Standard 50:50 beamsplitters effect the polarization of both the reflected and transmitted beams.
ULO Optics have developed a special coating ‘recipe’ which eliminates this problem, allowing
components to be used to provide a 50:50 power split at 45° incidence angle, reflecting 50% of both ‘S’
and ‘P’ polarization. As a result, incident circularly – polarized radiation is split equally into two circularly
Diameter : +0/-0.1mm
Thickness : ± 0.1mm
Parallelism : within 2 arc minutes
Flatness : Within λ/40 over any 25mm dia list area (@10.6μm)
Reflectivity : 50% ± 1%
Laser Damage threshold : > 200W/mm cw
1) The coating are visually opaque, (germanium is used as one of the coating layers), so this type
of beamsplitter cannot be used to split visible pointing-beams.
2) Due to the relatively high level of absorption in the coating, incident intensity levels should not
exceed 500W/cm2 in order to avoid thermal-lensing effects.
The products listed below are generally available from stock.