Photorefraction and Optical Damage Resistance Enhancement in Uranium-Doped Lithium Niobate Crystals by Hafnium Co-Doping. - Xu, Jiayue; Xi, Ming; Zhang, Dong; Fang, Chenkai; Zheng, Dahuai; Liu, Hongde; Chu, Yaoqing; Shen, Hui; Tian, Tian (Crystals (2073-4352), 2026)