Abstract
The p-polarized light beam is incident on the boundary between a right-angle prism and a test material. When the total internal reflection occurs at the boundary, and the p-polarized light has phase variation. It depends on the refractive index of the tested material. Firstly, the two-dimensional distribution of phase variation of the p-polarized light at the boundary is measured by the four-step phase shifting interferometric technique. Then, substituting the data into the special equations derived from Fresnel equations, the two-dimensional distribution of refractive index of the tested material can be obtained.
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