Quantum efficiencies and thermo-optical properties of Er3+ -Nd3+-, and Pr3+- single doped lead-indium-phosphate glasses...

The experimental determination of thermal and optical properties, such as the fluorescence
quantum efficiency (η) and temperature coefficient of the optical path length change, (ds/dT),
has been a challenging task. In this work, mode-mismatched thermal lens and spectroscopic
measurements were performed using Er3+-, Nd3+-, and Pr3+-doped lead-indium-phosphate
glasses to obtain the thermal diffusivity and conductivity, ds/dT, the thermal loading (nonradiative
quantum efficiency), and η. The experimental difficulties associated with obtaining
η for systems with several emitting levels, such as Er3+-doped materials, were overcome. A
discussion of the implications of the small η values obtained for Er3+- and Pr3+-doped glass,
is presented.