Abstract

We demonstrated detection of birefringence singularity on the space-variant retarder with an inhomogeneous birefringence distribution by supercontinuum vector beam. The birefringence measurement by supercontinuum vector beam analysis provides kinematics of a singularity point on the space-variant retarder. We conducted numerical calculations and experiments for proof of principle. The calculated results were characterized by relative positions with $({{{x}_0},{{{y}}_0}})$ between the singularity point and the vector beam. In the experiments, we measured the retardance and the azimuthal angle from intensity profile on a single-shot image captured at wavelengths of $\lambda = 450$, 550, and 650 nm. The retardances at $\lambda = 450\;{\rm nm}$ and 550 nm were changed from $\Delta = 112^\circ$ to 131° and from $\Delta = 120^\circ$ to 152° when the ${x_0}$ displacement of the space-variant retarder moved from 0 to 350 µm. The measured retardance corresponded with the calculated results in the function of the position of birefringence singularity.

© 2020 Optical Society of America

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