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14 September 1994 Phase-shift control in electro-optical analyzers
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Adjustment and stabilization of an optimal value of control voltage is a common problem in spectrum polarimetry when using electrooptical polarization analyzers. In this paper we give a description of a method to determine the quarter-wave phase shift when handling control signals of square form (of the type of a `meander'). The method is based on the symmetry property of the light characteristic of the optical shutter for modulators featuring a linear electrooptical effect. The version under consideration uses a standard quarter-wave plate. The plate of choice for this application is an achromatic quarter-wave plate. A high sensitivity of measurements is attained because the steepest parts of the light characteristic (near quarter- and 3/4-wave) participate in the signal shaping. The method may be used successfully to certify new specimens of quarter- and half-wave plates. Optical crystals that have longitudinal electrooptical effect, are often used in polarized light analyzers. The serve to create a controlled phase shift between the ordinary and the extraordinary rays. Voltages that give rise to a phase shift between the rays in (lambda) /2 and (lambda) /4, respectively, are called the half-wave and quarter-wave voltages (U(lambda /2),U(lambda /4)). It is these quantities that are most often featured in electrooptics.
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Victor M. Grigoryev and Nikolai I. Kobanov "Phase-shift control in electro-optical analyzers", Proc. SPIE 2265, Polarization Analysis and Measurement II, (14 September 1994);

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