Abstract
A technique for the measurement of the group refractive index wavelength dependence of
optical materials using a low-coherence tandem interferometer and a spectrometer is
proposed. Four channeled spectra resulting from interferences of light beams from
different pairs of optical paths are used for the calculation of optical path differences. The
group refractive index wavelength dependence is calculated from these optical path
differences generated from the sample under measurement. No a priori information of the
geometric thickness of a sample is required. The wavelength dependence of the group
refractive index of the samples BK7 parallel plate of 5.200 and
from
675 to
is experimentally measured with an accuracy of the order of
and a
repeatability of the order of
.
© 2006 Optical Society of America
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