A novel entirely passive electro-optic electric field sensor is reported. T
his sensor is based on the intensity change of the diffracted light from an
electro-optically induced Bragg grating in a periodically poled LiNbO3 dev
ice. This new type of electric field sensor is simple, inexpensive and capa
ble of achieving high sensitivity, Linear operation and very large bandwidt
h with stable intrinsic biasing.