Ternary bireflective parallel beamsplitting polarization prism

In order to save iceland and output two parallel polarized beams, a new type of bireflective parallel beam splitter combined of iceland and glass is designed. The prism is made of ZBaF3 glass, between which is iceland, using bromonaphthalene as the glue. Selecting the suitable structure angles, two polarized beam whose directions of electric vector are orthogonal can escape vertically to the same exit widow after their total reflection on the front cemented surface and the back surface respectively. The experiments indicate that the transmittance of the prism is more than 80%, and the extinction ratio is better than 10-3. Therefore, the prism still has good performance on the premise of saving iceland greatly.