A parallel-sided PLZT plate is positioned between two crossed Polaroid plates and the major faces of all three elements are normal to a parallel beam of monochromatic light (λ = 750 nm). The thickness of the PLZT plate is 1 mm and the electrodes, spaced 1 mm apart, are arranged such that a uniform electric field can be applied through the volume of the PLZT plate parallel to its major faces and at 458 to the transmission axis of each Polaroid plate. Calculate the voltage that must be applied between the electrodes to achieve maximum light transmittance through the system. Estimate the transmittance assuming 5% loss at each Polaroid surface and assuming that the PLZT element carries antireflection coatings and the material has an absorption coefficient of 65 m71. The PLZT is quadratic with
