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Interferometric determination of refraction and dispersion of a birefringent material: numerical procedure

✍ Scribed by S.Y. El-Zaiat

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
133 KB
Volume
34
Category
Article
ISSN
0030-3992

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✦ Synopsis

Air, liquid and solid sample interferometric gaps of the same thickness and simultaneously enclosed in a wedge interferometer are used to produce fringes of equal chromatic order. A mica sample of dimensions 2 Γ— 5 mm 2 and an immersion liquid of the same refractive index are used. A single shot interferogram containing fringes in the three gaps is su cient to deduce the needed experimental data. Locations of fringe maxima are introduced in a numerical procedure to retrieve the sample and liquid refractive indices across the visible spectrum. The numerical procedure is based on a simple dispersion function of wavelength and wavenumber. A modiΓΏed two-term Sellmeier dispersion formula has been used for ΓΏtting the experimental data and deducing the needed dispersion parameters.

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