Relationship between the luminescence energies of different transitions from a metastable level of neodymium ions in glasses

A determination was made of the relationship between the luminescence energies of the transitions from the $sup 4$F$sub 3$/$sub 2$ metastable state to the $sup 4$I$sub 9$/$sub 2$, $sup 4$I$sub 11$/$sub 2$, and $sup 4$I$sub 13$/$sub 2$ levels of Nd$sup 3+$ in silicate and phosphate glasses, characterized by a high directionality of laser radiation. The results of these measurements were compared with the data obtained for some mass-produced glasses. It was found that the variation of the composition within one base could alter the ratio of the luminescence energies of the two main bands (corresponding to the transitions from $sup 4$F$sub 3$/$sub 2$ to $sup 4$I$sub 9$/$sub 2$ and $sup 4$I$sub 11$/$sub 2$) by 10--15% and when the base of the glass was altered, this ratio could change by 30--35%.