Beamsplitters

Beamsplitters separate incident light into two components consisting of a reflected and a transmitted band. Beamsplitters is designed so to achieve a specified reflectance and transmittance over a spectral range of interest. Beamsplitters are used also to separate two polarizations. Typically the splitter is situated in a 45°-angle to the incident beam

Reflectance and transmittance of neutral beamsplitters are to be close to a constant in a specified spectral range. Values of reflectance and transmittance can be expressed in percentage, for example, 50% and 50%, 30% and 70% and so on.

	This beamsplitter operates in the spectral range from 400 to 800 nm. Target specifications: T=R=50% (unpolarized light) Materials: TiO2/SiO2, Glass substrate     The details of the design process are shown in Beamsplitter at normal incidence
OptiLayer allows designing beamsplitters exhibiting any specified ratio T:R, for example, T=30% and R=70% (left pane) or T=70% and R=30% (right pane). Spectral range of interest can be, for example, from 450 to 650 nm and AOI equal to 45 degrees.
See the details of our design process in our video exercise at YouTube