Measurement of the Quadratic Electro-Optic Coefficient of KTN Crystal with an Electro-Optic Modulation System in the Presence of Polar Nano-Regions oleh Lie-Kun Yang, Bing Liu, Pan-Yu Qiao, Hua-Jian Yu, Xu-Ping Wang, Jing Li, Yu-Guo Yang, Yuan-Yuan Zhang, Cheng-Cheng Qiu, Hua-Di Zhang