1 June 1999 Transmission variations in liquid crystal spatial light modulators caused by interference and diffraction effects
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Abstract
We report on the characteristics of a newly developed high- resolution (640x480 pixels) parallel-aligned liquid crystal spatial light modulator (LCSLM) as a function of wavelength. phase-only operation over a range of 2? rad is easily achieved by operating at shorter wavelengths. We also measure an unexpected effect?the transmitted light intensity changes with applied voltage. Our experiments show that thin- film interference and pixel diffraction effects are responsible for this observed behavior. The diffraction effect is caused by a nonuniform electric field across each pixel. This nonuniform electric field introduces a blazing effect that changes the intensity distribution in the various diffracted orders as a function of applied voltage. These same kinds of effects have been observed with several other twisted-nematic LCSLMs. Because of the complicated polarization effects caused by these twisted-nematic liquid crystal devices, however, the diffraction and interference effects are more easily studied using the parallel-aligned LCSLM.
Jeffrey A. Davis, Jeffrey A. Davis, Philbert S. Tsai, Philbert S. Tsai, Don M. Cottrell, Don M. Cottrell, Tomio Sonehara, Tomio Sonehara, Jun Amako, Jun Amako, } "Transmission variations in liquid crystal spatial light modulators caused by interference and diffraction effects," Optical Engineering 38(6), (1 June 1999). https://doi.org/10.1117/1.602149 . Submission:
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