We report a new interferometric technique for measuring the ordinary and extraordinary, refractive indices of uniaxial crystals. The technique is based on the measurement of the rotation-dependent phase changes of the optical path length in crystal plates. Accurate measurement of the phase shift as a function of the rotation of the sample is achieved by using a fast-Fourier-transform based fringe analysis method for phase retrieval. The principle of the method is discussed and measurements of the ordinary and extraordinary refractive indices of a lithium niobate crystal are reported.
Mach-Zehnder interferometric system for measuring the refractive indices of uniaxial crystals
De Nicola S;Ferraro P;Finizio A;De Natale P;Grilli S;Pierattini G
2003
Abstract
We report a new interferometric technique for measuring the ordinary and extraordinary, refractive indices of uniaxial crystals. The technique is based on the measurement of the rotation-dependent phase changes of the optical path length in crystal plates. Accurate measurement of the phase shift as a function of the rotation of the sample is achieved by using a fast-Fourier-transform based fringe analysis method for phase retrieval. The principle of the method is discussed and measurements of the ordinary and extraordinary refractive indices of a lithium niobate crystal are reported.File in questo prodotto:
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