Beam Splitter Calculator
Calculate R/T power splitting, Fresnel reflectance, and plate beam displacement.
Beam splitters appear in three distinct engineering contexts addressed by this tool's three modes. R/T Power Splitter distributes an input power into reflected and transmitted fractions for standard coating ratios (50/50, 70/30, 90/10, 95/5, 99/1, or custom), accounting for surface absorption loss. Fresnel Reflectance computes s- and p-polarization reflectance and transmittance at an interface between two refractive indices via the Fresnel equations, reporting the refraction angle and Brewster's angle — useful for uncoated glass substrates and optical windows. Plate Displacement calculates the lateral beam offset introduced when a flat optical plate is placed in a beam at angle, along with front-surface and back-surface contributions — relevant for any diagnostic or sampling plate inserted at oblique incidence.