Unit Reflective Polarizing Beam Splitter Design

Refractive prisms which are designed basing on birefringent character on surface of calcite crystal are new patterns of prisms. Not only can they split o and e light which are both linearly polarized light, but also can change the propagating directions of o and e light. At present, there are several patterns of refractive prisms, most of which are composed of two parts. For the existence of cementing layer, the transmission of light is not very high. In order to improve the transmission of light, two new patterns which have only one part are designed in my paper. Some of the design ideology is drawn lessons from the old patterns. Basing on theory analysis and experimental measurement, we analyse the two patterns' optical performances. The full text includes the following contest briefly.In the first chapter, some basic knowledge, such as species and performances of polarizing prism, fields of application and so on, are explained and then is the introduction of the main content of this paper.Some basic theories of polarizing devices are recommended at the beginning of the second chapter. After that detailed explanation of polarizing prisms and beam splitting prisms, including species, design ideologies and performance parameters, is done. Finally, we illustrate some other knowledge related to prism, such as phase delay devices, depolarizing devices and main points of prism designation which is especially important for prism made of calcite crystal.The last three chapters are the focal points in my paper and also my work. Some important parameters of the prisms we designed are analysed in full, such as structures, optical performances and so on. Of cause, detailed experimental measurements are very necessary. First of all, two new prisms including five different structures, which are all modular construction and can split light by double reflective property of calcite crystal, are tendered. Theory analysis turns out that, each prism can make sure that the two light's emergence angles are equal. After prisms' structures are fixed, some important parameters of each prism are analysed, such as how splitting angle's asymmetry and transmission of light varied when incidence angle and incidence wave length are changed. Comparing the performances of these prisms, two prisms which have better performances and can represent the two patterns considered above are processed. Though comparison of experimental results and theory results, we can conclude that, although deviation is exist, the basic tendency is still coincident, especially from the comparison of experimental data and theory data which can render the variation of splitting angle's asymmetry when incidence angles are changed. From testing of extinction ratio we can find that, the extinction ratio of o light is prior than the extinction ratio of e light, but both of them are higher than 10^-5.Both of the results of theory analysis and experimental testing are all illustrated that, the performances of these two prisms basing on double reflection are quite well and they can be used in several field.The main innovations of this article are that: we put forward a new design idea of prism. This new prism is basing on double refraction and has only one part. After theory analysis in full, the performances of the prism are certified by experiment.