Abstract
A series of Er/Yb:LiNbO3 crystals tridoped with x mol% In3+ ions (x=1, 2 and 3mol%) was grown by Czochralski technique. Under 980nm excitation, the strongest intensity of 1.54μm emission was observed for 2mol% In3+-tridoped Er/Yb:LiNbO3 crystal. The UV–vis–infrared absorption spectra of In/Er/Yb:LiNbO3 crystals were measured, and Judd–Ofelt (J–O) theory was carried out to predict the J–O intensity parameters (Ωt), radiative lifetime τrad and fluorescence branching ratio β. The emission cross-section of the 4I13/2→4I15/2 transition of Er3+ ion was calculated by Füchtbauer–Ladenburg (F-L) method. The gain cross-section, estimated as a function of the population inversion ratio, allowed us to evaluate a potential laser performance of In/Er/Yb:LiNbO3 crystal at 1.54μm emission. The fluorescence lifetimes of the 4I13/2→4I15/2 transition in In/Er/Yb:LiNbO3 crystals were measured.
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