| http://www.w3.org/ns/prov#value | - A bias potential is applied from an electric source Vac between the transparent electrode Et and the electrode Er to generate an electric field within the photomodulation layer member PML and the reflecting mirror layer M. A material of the photomodulation layer member PML may be lithium niobate (LiNbO3), PLZT, twisted nematic liquid crystal or other materials having an electro-optic effect or bir
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