Composition Dependent Spectroscopic Properties of Nd~(3+) Doped Sodium Lead Borate Glasses

摘要

Nd~(3+) doped oxide glasses of the type xNa_2O-30 PbO-(69.5-x) B_2O_3-0.5Nd_2O_3 were prepared and investigated for physical and spectroscopic properties. Optical absorption spectra and Judd-Ofelt theory has been used to determine the oscillator strengths and the intensity parameters Ω_λ (λ=2, 4, 6). The radiative transition probability (A), radiative lifetime (τ_R) and branching ratio (β_R) for the fluorescent levels of Nd~(3+) in the prepared glasses have been determined. The lasing efficiency of the prepared glasses has been characterized by the spectroscopic quality factor (Ω_4/Ω_6), the value of which is in the range 0.2-1.5, typical for Nd~(3+) in different laser hosts. The radiative transition probability of the potential lasing transition ~4F_(3/2) → ~4I_(11/2) of Nd~(3+) ions is found to increase with increase in content of Na_2O.