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The crystal which is covered by electrode may be considered to be a voltage-variable wave-plate. When a voltage is applied, the retardation of laser polarization of the light would be changed while a beam passes through an ADP crystal. This variation in polarization results in intensity modulation downstream from the output polarizer. The output polarizer converts the phase shift into an [[amplitude modulation]].
Micrometre-scale silicon electro-optic modulator<ref>Nature 435, 325-327 (19 May 2005)</ref>
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