Spectroscopic properties of heavily Ho3+-doped barium yttrium fluoride crystals
Ji En-Caia), Liu Qiang†a), Nie Ming-Minga), Luo Huib), Hu Yu-Xib), Guan Zhou-Guob), Gong Ma-Lia)
       
Schematic diagram of Ho: BYF crystal sructure. (a) crystallographic axes ( a , b , c ), principal axes ( x , y , z ) and optic axes ( OA 1, OA 2) in BaY2F8; (b) crystallographic axes ( b , c ) in our processed Ho: BYF crystal.