Fig. 1.

Schematic of the ODT sample arm geometry. (a) The orientation of the uniaxial sample is defined by the inclination angle $\alpha$ and the direction angle $\phi$. The sample is rotated around the $x$-axis for tomographic measurement. The input polarization state is along the $x$-axis, after which the parallel polarized $x$-component (a) or the cross-polarized $y$-component (b) of the complex wave is measured for each projection angle. The tomographic angle $\beta$ is defined with respect to the fiber orientation in the $y$-$z$ plane. The angle of the polarizers $\rho$ is defined with respect to the $x$ axis.