Two commercial beamsplitter coatings, a 22-layer Ta2O5/SiO2 stack and a 5-layer SiOx/SiO2 stack, come close to equal reflectivity and phase for both polarisations but not both at 45 degrees.
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All-polarisation beamsplitters for interferometer applications
Two commercial beamsplitter coatings, a 22-layer Ta2O5/SiO2 stack and a 5-layer SiOx/SiO2 stack, come close to equal reflectivity and phase for both polarisations but not both at 45 degrees.