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

✍ Scribed by S.Y. El-Zaiat

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 151 KB
• Volume: 33
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(00)00124-9

✦ Synopsis

Fringes of equal chromatic order are produced in air, immersion liquid and mica sample interferometric gaps. The three gaps are of the same thickness and simultaneously enclosed in a wedge interferometer. A single-shot interferogram contains fringes in the three gaps is su cient to deduce the needed experimental data. A non-numerical procedure is used for determining the refractive indices of the immersion liquid and mica sample across the visible spectrum. There is no need for any numerical ÿtting stage nor for the application of any theoretical model concerning the dispersion behavior of the sample under test. A modiÿed two-term Sellmeier dispersion formula has been used for ÿtting the experimental data and deducing the needed dispersion parameters.