Abstract
The angular sensitivity of Brewster-angle reflection polarizers (BARP) is first studied approximately by determining the Taylor series expansion of the parallel reflectance Rp as a function of angle of incidence ϕ near the Brewster angle ϕB. Subsequently, exact and explicit equations are derived that determine the lower and upper limits, ϕl and ϕu, of the range of ϕ, that includes ϕB, over which Rp or the extinction ratio ER is below a stated limit L. Examples are given of Ge and Si IR BARP for which ϕl and ϕu are calculated for L from 10−6 to 10−1 in ascending multiplicative steps of 10.
© 1987 Optical Society of America
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