Abstract
We show both experimentally and by numerical simulation that in the
polarization interferometry of inhomogeneous birefringent objects, besides the
usual interference fringes, interference blots may appear. In a light-field
circular polariscope, interference blots are dark areas that may expand
through a number of interference fringes. In a dark-field circular
polariscope, interference blots are bright. In the vicinity of the
interference blots interference fringes are deformed and their bifurcation may
occur. It is shown that the cause of the interference blots is rotation of the
principal birefringence axes.
© 1997 Optical Society of America
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