Xiang-Cao Li, Bao-An Liu, Meng Li, Chun-Yan Yan, Jie Ren, Chang Liu, Xin Ju. Photoluminescence spectrum study of defects of potassium dihydrogen phosphate crystals irradiated by different laser fluences [J]. Acta Physica Sinica, 2020, 69(17): 174208-1