Spectroscopic properties of heavily Ho<sup>3+</sup>-doped barium yttrium fluoride crystals

Spectroscopic properties of heavily Ho³⁺-doped barium yttrium fluoride crystals

Ji En-Cai^a), Liu Qiang†^a), Nie Ming-Ming^a), Luo Hui^b), Hu Yu-Xi^b), Guan Zhou-Guo^b), Gong Ma-Li^a)

Measured infrared luminescence spectra of 30 at.% Ho: BYF at room temperature. (a) Near-infrared spectrum around 2 μm, (b) mid-infrared spectrum around 3 μm, (c) mid-infrared spectrum around 4 μm.