Characterization of the birefringence of materials offers the
opportunity to develop applications and elements to manipulate the
polarization of light. We propose a new method for characterizing the
effective phase retardation based on the linear birefringent law. The
proposed method is flexible and easy to implement; it also determines
the retardation introduced by a linear birefringent as from an input
polarization state and a specific output state generated by the
rotated material. The method is evaluated experimentally by
characterizing the birefringence of cellophane samples.
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