Abstract

The inverse transmittance (1/T) of a quarterwave all dielectric multilayer stack is expressed as a mixed series in sinϕ and cosϕ, where ϕ = (π/2)[(λ − λ₀)/λ] and λ₀ is the reference wavelength. This expression has been used to design achromatic beam splitters for the visible and near IR regions having different reflectance (R) to transmittance (T) ratios (e.g. R:T = 70:30, 30:70, 50:50, 60:40, 40:60, etc.). The theoretical design places emphasis on the selection of refractive indices which can be realized in practice.

© 1990 Optical Society of America

General expression for the reflectance of an all-dielectric multilayer stack

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