Abstract
We show interferometric measurements of the phase delays for both eigenvectors in a twisted nematic liquid crystal spatial light modulator (LCSLM). These polarization eigenvectors are of interest for newer LCSLMs that are thinner and consequently have a lower birefringence compared with earlier devices. We use a new technique in which an electro-optic light modulator provides a time varying phase shift between the electric field components in the two arms of a Mach–Zehnder interferometer. The appropriate eigenvectors are generated and detected for a LCSLM located in one arm of the interferometer. We then use a lock-in amplifier to accurately measure the phase delay for the LCSLM as a function of applied voltage. Our experimental results show agreement with the theory.
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