Past research on all-dielectric nonpolarizing beam splitters is reviewed. I
t is shown that, for a 50-nm spectral region, it is possible to design and
manufacture a two-material nonpolarizing plate beam splitter for use at an
angle of 45 degrees (with a measured rms reflectance of 0.50 +/- 0.01 for b
oth s- and p-polarized incident light). (C) 1999 Optical Society of America
. OCIS codes: 120.2440, 230.1360, 260.5430, 310.0310, 310.1620.