Dy3+-doped Ge-In-S-CsI chalcohalide glasses for 1.3 mu m optical fiber amplifier

Dy3+-doped Ge-In-S-CsI chalcohalide glasses were prepared by the well-established melt-quenching technique, and the thermal stabilities, absorption spectra, densities, refractive indics, fluorescence spectra and lifetimes were investigated. The intensity parameters Omega(t) (t=2, 4, 6), transition probabilities, exited state lifetimes and the branching ratios were calculated by using the Judd-Ofelt theory. The radiative quantum efficiencies and emission cross sections of 1.3 mu m emission were then confirmed. The 64GeS(2)center dot 16In(2)S(3)center dot 20CsI glass with good thermal stability (the glass transition temperatures T-g is 360 degrees C and the difference between the onset crystallization temperature T-x and T-g is 149 degrees C), long fluorescence lifetime (T-mea = 154 mu s) and high radiative quantum efficiency (eta=20.9%) is considered to be an attractive host material for 1.3 mu m optical fiber amplifiers