Abstract: The present disclosure is directed to methods of making polarizing beam splitters. An exemplary method includes supporting a polarizing film within a mold, where the polarizing film has a first surface and a second surface, injecting a polymeric material into the mold adjacent the first surface of the polarizing film, solidifying the first polymeric material to form a first prism, and securing a second prism to the second surface of the polarizing film. Another exemplary method includes injection molding a component of the polarizing beam splitter including a first polymeric material and heat treating the first component up to a temperature that does not exceed about 20° C. below a glass transition temperature of the first polymeric material.