Tungsten–tellurite glass: a new candidate medium for Yb 3+-doping

Abstract

Yb 3+-doped tungsten–tellurite glasses with compositions of (50–70)TeO 2–(30–10)WO 3–20Li 2O, (80–90)TeO 2–(10–0)WO 3–10BaO, (65–75)TeO 2–(25–15)WO 3–10La 2O 3, (55–65)TeO 2–(35–25)WO 3–10Bi 2O 3 and (80–85)TeO 2–(10–5)WO 3–10Nb 2O 5 (mol%) have been prepared. Thermal stability and spectroscopic properties of Yb 3+-doped ternary tungsten–tellurite glasses have been measured. Yb 3+-doped La 2O 3- and Nb 2O 5-containing ternary tungsten–tellurite glasses possess the difference between the glass transition temperature ( T g) and the onset crystallization temperature (T x ), ΔT (=T x −T g )>160 °C, a flat absorption shoulder located between 940 and 960 nm region with absorption cross-sections >0.5×10 −20 cm 2, secondary emission cross-sections (at ∼1.02 μm)>0.7×10 −20 cm 2, and the ratios of secondary-to-primary peak emission cross-sections, σ s/ σ p>70%, respectively.