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)
       
Variations of the emission cross section with wavelength, calculated based on experimental absorption spectrum at room temperature.