Design of coating for broadband polarization — independent beam splitters and analysis of its optical performance

A design of coating on the entrance surface of the beam splitters with a transparent thin film of certain refractive index and thickness was presented. For this kind of beam splitters, it was possible to realize polarization-independent beam-splitting for chosen wavelength λ with incident angle ϕ. In addition, the simulation results using the coating designable software ( Auto film ) were consistent with the theoretical results, and the beam splitters are not sensitive to the small errors of film-thickness and film refractive-index over a broad spectra.