A voltage sensor is composed by arranging along the optic axis, successively from the side of incident light, a first polarizer, a Pockels cell for detection, a Pockels cell for modulation, and a second polarizer wherein an electric field proportional to a voltage to be measured is applied to the Pockels...http://www.google.de/patents/US5477134?utm_source=gb-gplus-sharePatent US5477134 - Voltage sensor for use in optical power transformer including a pair of Pockels cells
