Optimal optical parameters of the beam splitter that is used in the division-of-amplitude photopolarimeter are determined. These are (1) 50%–50% split ratio of the all-dielectric beam splitter, (2) differential phase shifts in reflection and transmission Δ<sub>r</sub> and Δ<sub>t</sub> that differ by ±π/2, and (3) ellipsometric parameters (ψ<sub>r</sub>, ψ<sub>t</sub>)= (27.368°, 62.632°) or (62.632°, 27.368°). It is also shown that for any nonabsorbing beam splitter that splits incident unpolarized light equally, the relationship ψ<sub>r</sub>+ψ<sub>t</sub>=π/2 is always satisfied.
© 2003 Optical Society of America
(120.2130) Instrumentation, measurement, and metrology : Ellipsometry and polarimetry
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(230.1360) Optical devices : Beam splitters
(260.5430) Physical optics : Polarization
R. M. A. Azzam and A. De, "Optimal beam splitters for the division-of-amplitude photopolarimeter," J. Opt. Soc. Am. A 20, 955-958 (2003)