VUV AND UV FLUORESCENCE AND ABSORPTION STUDIES OF ND3-CRYSTALS( AND HO3+ IONS IN LIYF4 SINGLE)

The laser induced fluorescence spectra of LiYF4:ND3+ (YLF:Nd) and LiYF 4:Ho3+ (YLF:Ho) single crystals, pumped by an F2 pulsed discharge mole cular laser at 157 nm were obtained in the vacuum ultraviolet (VUV) an d ultraviolet (UV) regions of the spectrum. With this pumping arrangem ent a number of new fluorescence peaks were observed for the first tim e. They are assigned to the dipole allowed transitions 4f(2)5d --> 4f3 and 4f(9)5d --> 4f10 of the Nd3+ and Ho3+ ions, respectively. The abs orption spectra of the same crystal samples in the VUV and UV spectral regions were taken as well.