A method is described for the calibration of a nonexact quarter-wave plate. This method makes use of the sensitive dependence on the retardation angle, for retardation angles near 90 degrees , of the functional relation between the orientation of the quarter-wave plate optical axis and the orientation of the polarization ellipse major axis, both with respect to the axis of the initial linear polarizer.
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Grunstra et al. (1966) studied this question.
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