Judd–Ofelt analysis of spectroscopic properties of Nd 3+-doped novel fluorophosphate glass

Abstract

Judd–Ofelt analysis is performed for the new MgF 2–BaF 2–Al(PO 3) 3–Ba(PO 3) 2-based glass system to evaluate the spontaneous emission probability as well as quality factor and branching ratio. The variation of intensity parameters Ω 2 , Ω 4 , and Ω 6 are analyzed as a function of Nd 2O 3 concentration. It is found that the efficiency for the 4F 3/2→ 4I 9/2 transition enhances and the efficiency for the 4F 3/2→ 4I 11/2 transition diminishes as the difference between Ω 4 and Ω 6 increases with an increase in Nd 2O 3 concentration. The emission cross section for the 4F 3/2→ 4I 13/2 transition varies from 1.1×10 −20 to 1.15×10 −20 cm 2, and for the 4F 3/2→ 4I 11/2 transition it varies from 2.97×10 −20 to 2.69×10 −20 cm 2 with an increase in Nd 2O 3 concentration from 1 to 5 wt%. Analysis on non-radiative decay is performed based on multiphonon relaxation mechanisms. The above results are also compared with those of other host glass materials with the similar Nd 3+ dopant concentration, which suggests that present new glass is promising for fiber laser applications.