A little displacement polychromatic parallel non-polarization beamsplitter, which is composed of two elements, has been introduced in this article. It has been studied by theoretical analysis and experiment, and has been given the optimal structure. The displacement of the beamsplitter can be designed in need, which is about 1.0 - 3.0 mm. The polarization degree of the emergent light is below 1.2%, transmission is above 90%, transmission range is from 300 nm to 2500 nm. Its structure is simple, making convenient and loss low.
Fuyun Xu, Fuyun Xu,
"Nonpolarization parallel beamsplitter", Proc. SPIE 1752, Current Developments in Optical Design and Optical Engineering II, (10 December 1992); doi: 10.1117/12.130744; https://doi.org/10.1117/12.130744