Investigation on 1.07 mu m laser emission in Nd(3+)-doped sodium fluoroborate glasses

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 ( Omega (2.4.6)) were used to evaluate the laser characteristic parameters such as radiative transition probability (A(R)), radiative decay time ( tau (R)), fluorescence branching ratio ( beta (R)) and stimulated emission cross-section ( sigma (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.