Partial reflective coating is always used in beamsplitters application. There are some kinds of partial reflective coating.
Single Wavelength Partial Reflective Coatings (SPR)
When a narrow wavelength radiation is incident on SPR coating, part of the radiation is reflected and the other part is transmitted. This coating always show a high reflectivity for S-polarization radiation and high transmission for P-polarization radiation. The main application of this coating is for a beamsplitter with 45¡ã angle of incidence. It is the most commonly used, low-cost anti-reflection coating, and widely used in Lens & Prism, Input & output surface.
Broadband Wavelength Partial Reflective Coatings (BPR)
BPR coating has similar performance to that of SPR coatings. However, BPR coating can split the incident radiation over a wide spectrum, not SPR. It can be widely used to split the incident radiation over a wide spectrum.