We numerically investigated the performance of an achromatic polarization-preserving beam displacer that was proposed by Galvez [Opt. Lett. 26, 971 (2001)]. First, the four-prism configuration of the Galvez scheme is verified by simulation. We examined the extension of wavelength beyond visible light by considering the corresponding power loss. The degree of polarization is also considered. The tolerance of tilts of reflecting surfaces is comprehensively discussed. It is shown that the second reflector of a four-prism system is the most critical component. Performance of various materials, including plastics, is evaluated. We explain a simplified implementation based on two prisms (the classic Porro configuration), which also improves material performance.
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