Spectroscopic properties and Judd–Ofelt analysis of Dy3+-doped and Dy3+, Tm3+-codped Ge–In–S chalcogenide glasses

0.2 wt.% dy3+-doped and 0.2 wt.% dy3+, 0.5 wt.% tm3+-codoped (100-x)ges2 center dot xin(2)s(3) (x = 5,10,15,20,25) chalcogenide glasses were prepared. their spectroscopic properties were analyzed based on absorption (ranges from 500 to 3000 nm) and emission (ranges from 1000 to 4700 nm) measurements. the judd-ofelt strength parameters omega(t) (t = 2, 4, 6) and the spectroscopy parameters a(rad), beta and t-rad were calculated, and the sigma(emi) of the 1330, 2930 and 4320 nm fluorescences were estimated. these dy3+-doped and dy3+, tm3+-codoped ge-in-s chalcogenide glasses are valuable materials for using in 1.3 mu m fiber-amplifiers and 2-5 mu m mid-infrared laser devices. (c) 2013 elsevier b.v. all rights reserved.