Multiple half-wave filters can be detuned to provide a nonpolarizing edge at a specific angle of incidence. For the case of quarter-wave layers, an analytic expression for the necessary amount of detuning can be derived. For nonquarter-wave layers, a more empirical design approach is used. The resulting two-material producible designs improve current limitations in wavelength-division multiplex transmission over multimode optical fibers.
© 1981 Optical Society of America
Alfred Thelen, "Nonpolarizing edge filters," J. Opt. Soc. Am. 71, 309-314 (1981)