Investigation on 1.07 μm laser emission in Nd3+-doped sodium fluoroborate glasses

Abstract Spectroscopic and fluorescence properties of Nd 3+ ions in sodium fluoroborate (SFB) glasses were prepared and characterized through optical absorption, emission and decay measurements. The energy level analysis was carried out using free-ion Hamiltonian model. Experimental oscillator strengths were determined by measuring the area encompassed by the absorption peaks recorded for 1.0 mol.% Nd 3+ - doped glasses. The Judd-Ofelt parameters (Ω 2,4,6 ) were used to evaluate the laser characteristic parameters such as radiative transition probability ( A R ), radiative decay time (τ R ), fluorescence branching ratio ( β R ) and stimulated emission cross-section (σ e) for the 4 F 3/2 metastable state. The fluorescence spectra for different concentrations of Nd 3+ ions were recorded by exciting the samples at 514.5 nm Ar + ion laser.