Yttrium Vanadate (yvo <sub> 4 </ Sub>) Polarizing Prism Features

At present the material to manufact polarized prism is almost natural calcite, it intensified the consumption of calcite , moreover, because the characteristic of calcite is unable to satisfy the demandents of high efficiency in the laser application and the project environment application. But the YVO₄ crystal may mask up this disappointment.There dose not have the YVO₄ crystal polarized prisms, only materials properties research has been reported in the available literature. The design of related device is only at the laboratory stage, and it has not evaluation standards of technical properties. There will be important significance to science and technology's development to realize commercialization of YVO₄ polarized prisms.Basing on the theory of calcite prism research, this paper designs a YVO₄ polarized prism. Gives some formulas which apart describe the relation between light transmittance of prisms and the two parameters is wavelength, incident angle. And some experiments are designed to validate the theoretical results. Generally, the main content is as follows:In the introduction, we summarized the fields of application, materials used and the primary forms of design of crystal polarizing prisms. The present research actuality to this field, the source of this research subject, and the sense of this research are also introduced.In the second chapter, firstly, we introduce part of the basic theory and the design principal of calcite prisms; then we have a summary to the design of Nichol prism, and introduce the design of glued Glan-type polarizing prisms and air-spaced Glan-type polarizing prisms in detail; finally we summarized several polarizing beam splitters. We have designed a Glan-Foucault prism with YVO₄ material.In the third chapter, according to Fresnel formula and geometrical ubiety, we get two formulas on light transmittance of polarizing prisms. Multiple-beam interference between two incision inclines of polarizing prism is considered in one formula and is not considered in the other formula. Then the theoretical relation between light transmittance of some polarizing prisms and each of the parameters as wavelength, and incident angle is given in this paper.In the fourth chapter, on the basis of the formulas which are given in the third chapter, corresponding experimental systems are devised to verify our theory and laboratorial curves are painted. In addition, the relevant theoretical curves can also be gotten depending on the foregoing formulas. Considering all erroneous factors, we find the results verify our theory by contrasting the laboratorial curves with the theoretical ones. The original points of this thesis lie in:(1) Analyzed the conditions of the refractive index of o ray of YVO₄ with the wavelength of visible and near infrared light is given in this paper. Furthermore, a relational expression about light transmittance and wavelength of visible light is given. The variant tendency of the transmission spectrum of Glan- Foucault prism we get by spectrometer accords with the theoretical curve.(2) This paper gets the relationship between light transmittance of Glan- Foucault prism and incident angle when abnormal incident beam is in the plane formed by incision incline normal and incident face normal.(3) Analyzed the transmission and extinction ratio changes pre-and post coating.