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 ⁴F_3/2 metastable state to the ⁴I_9/2, ⁴I_11/2, and ⁴I_13/2 levels of Nd³⁺ 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 ⁴F_3/2 to ⁴I_9/2 and ⁴I_11/2) by 10–15% and when the base of the glass was altered, this ratio could change by 30–35% .