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Applied Optics

Applied Optics


  • Vol. 39, Iss. 32 — Nov. 10, 2000
  • pp: 5991–5997

Accurate measurement of the refractive indices of solids and liquids by the double-layer interferometer

M. A. Khashan and A. Y. Nassif  »View Author Affiliations

Applied Optics, Vol. 39, Issue 32, pp. 5991-5997 (2000)

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The rings of equal inclination of the double-layer interferometer disappear in their common center if a plane-parallel glass plate is rotated inside one of the interferometer gaps that is filled with a liquid. Knowledge of the ring count and the rotated angle allows the refractive indices of both the rotated plate and the liquid to be found from a new analytical formula accurate to ±0.0004. The experimental results for glass, distilled water, and methanol are fitted to the Sellmeier dispersion function to determine their quantum parameters such as the absorption wavelengths in the ultraviolet side of the spectrum and the atomic number densities contributing to these absorption bands.

© 2000 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5710) Instrumentation, measurement, and metrology : Refraction
(260.2030) Physical optics : Dispersion

Original Manuscript: December 21, 1999
Published: November 10, 2000

M. A. Khashan and A. Y. Nassif, "Accurate measurement of the refractive indices of solids and liquids by the double-layer interferometer," Appl. Opt. 39, 5991-5997 (2000)

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