Abstract
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
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