Abstract
The refractive indices along arbitrary wave vector are analyzed in a uniaxial crystal with buried optical axis. According to the Brewster angle law, the relations between the Brewster angles of the incident p-polarized light and the two principal refractive indices are obtained for the case that the optical axis is in the incident plane. Further, for the case of unknown optical axis, the two principal refractive indices and the direction of optical axis can be calculated by inserting the experimental Brewster angles into the specially derived equations. On the other hand, the functions for the reflectivity fitting corresponding to two cases, i.e. , s-polarized light and p-polarized light, are presented. Finally, the CaCO<sub>3</sub> crystal has been measured both in s-polarized light and p-polarized light with a view to carefully study the effect of incident angle on reflectivity. The accuracy of our measurement is able to reach 0.0001 without the need of any machining process on the sample.
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