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)
       
Output characteristics of preliminary mid-infrared Ho: BYF laser pumped by 889 nm Cr3+:LiSAF laser.