Optical radiative parameters and 1.3μm emission anticipation of Pr3+Pr3+ in two kinds of bismuth-containing oxide glasses with lower phonon energies

Trivalent praseodymium ions were added in bismuth-containing tellurite (LKBBT) and gallate (LKBBG) glasses to develop potential oxide glass amplifier medium operating at 1.3μm. Based on optical absorptions, three phenomenological Judd–Ofelt parameters Ω2Ω2, Ω4Ω4 and Ω6Ω6 of Pr3+Pr3+ have been derived to be 4.14×10-204.14×10-20, 6.88×10-206.88×10-20 and 4.71×10-20cm2 in LKBBT system, and 3.85×10-203.85×10-20, 7.20×10-207.20×10-20 and 3.10×10-20cm2 in LKBBG system, respectively. Large Ω2Ω2 values indicate higher asymmetry and stronger covalent environment in them. The branching ratios for G41→H53 transition of Pr3+Pr3+ in the two glass systems arrive at 60.5% and 56.9%, respectively, and the predicted spontaneous-radiative transition rates are as high as 1188 and 1112s-1, which are beneficial in achieving efficient 1.3μm emission under the pumping of 1.03μm laser sources.