Effects of WO3 on optical properties of Er3+-doped tungsten-tellurite glasses

Tungsten-tellurite glasses with the molar compositions of (60 + x)TeO2-(30 - x)WO3-8BaO-2Na(29)O-0.5Er(2)O(3) (x = 0,5, 10, 15, 20) have been prepared. Effects of WO3 on optical properties of Er3+ -doped tungsten-tellurite glasses have been discussed. Along with the WO3 content increasing, Omega(2) and Omega(6) first increase and then decrease, and the stimulated emission cross-section also behaves in like manner, while Omega(4) changes contrarily. According to the McCumber theory, the maximum peak of sigma(e) is calculate to be 1.00 X 10(-21) cm(2) at 1.55 mu m. The maximum FWHM of Er3+4 I-13/2 -> I-4(15/2) emission spectrum is 82 nm. In addition, the intensity of upconversion luminescence of the EP3+ -doped tungsten-tellurite glasses decreases rapidly with the increasing Of WO3 content.