Mid-infrared emission properties of Dy3+ -doped Ge-Ga-S-Csl glasses

A series of chalcogenide glasses based on Ge-Ga-S-CsI system doped with different Dy3+ ions were synthesized by melt-quenching technique. The refractive indices, Raman spectra, absorption spectra, near-and mid-infrared fluorescence of glass samples were measured. The intensity parameters (Omega(i), i = 2,4,6), transition probabilities (A), branching ratios (beta) and radiation lifetimes (tau(tad)) have been predicted for Dy3+ ions in the samples by using the Judd-Ofelt theory. The mid-infrared fluorescence properties were investigated for different Dy3* ion concentrations under 810 nm laser excitation. The multiphonon relaxation rates (W-mp) of Dy3+ : H-13/2 -> H-6(15/2) (2. 86 mu m) and (6)H11/2 -> H-6(13/2) (4.38 mu m), and the constant related to the e-p coupling strength (alpha) of Ge-Ga-S-CsI glasses were evaluated