Abstract
We report an experimental procedure for achieving spatial modulation
of the phase of an input wave field with an off-the-shelf twisted nematic
liquid crystal display. This method involves illumination of an addressed
liquid crystal display (LCD) with circularly polarized light and measurement
of the Stokes parameters of the outgoing beam as the applied voltage is changed.
The analysis of the distribution of the polarization states in the <i>S</i><sub>1</sub>-<i>S</i><sub>2</sub> plane suggests a simple
way to optimize the liquid crystal phase response by means of a properly oriented
quarter wave-plate followed by an analyzer. Laboratory results for a commercial
display are presented. A phase modulation depth of 240° is obtained at 514 nm with a residual intensity
variation which is lower than 4%.
© 2007 IEEE
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