Improvement of the photorefractive response in bismuth and magnesium co-doped lithium niobate crystals via oxygen-vacancy modulation through controlled redox annealing. - Wang, Shuolin; Wang, Weiwei; Zhang, Yuqi; Hu, Youyou; Zheng, Dahuai; Liu, Hongde; Kong, Yongfa (Frontiers in Physics, 2025)