Pockels response in calcium barium niobate thin films

The electro-optical response of calcium barium niobate ferroelectric thin films is characterized using a single beam setup in reflection geometry. Clear evidence of a Pockels response together with an r33 coefficient as high as 130 pmV is found. This large value and the high Curie temperature of the material under study (>250 °C) can be considered as a promising feature for the fabrication of hybrid, integrated electro-optical modulators working at a high repetition rate. © 2007 American Institute of Physics.