Tm3+-Yb3+ Codoped Lithium-Titanate Tellurite Glasses

The optical behaviour of Tm3+-Yb3+ codoped tellurite glass in presence of Li2CO3 and TiO2 modifiers, prepared by conventional melt and quench technique has been investigated with the help of NIR-Visible UC study. The generation of the visible UC bands around ∼ 476 nm, ∼702 nm, ∼795 nm and a weak peak around ∼ 653 nm, due to the 1G4→ 3H6, 3F2→ 3H6, 3H4→ 3H6 and 1G4→ 3F4, transitions respectively under 980 nm excitation have been discussed in detail with the help of energy level diagram.