[摘要]：The effect of In3+ ion on the optical characteristics of Er3+ ion in Er/Yb:LiNbO3 crystal under 980 nm excitation has been investigated. The Er and Yb contents in the crystals were measured by an inductively coupled plasma atomic emission spectrometer (ICP-AES). A significant enhancement of 1.54 mu m emission was observed for Er/Yb:LiNbO3 crystal doped with 1 mol% In2O3. The studies on the UV-vis absorption and the OH- absorption spectra indicate that the threshold concentration of In3+ ion decreases with the Er/Yb doping in Er/Yb/In:LiNbO3 crystal. The 1 mol% In2O3 doping results in the reduction of absorption cross section in the UV-vis region, meaning the formation of Er3+ cluster sites. The enhancement of 1.54 mu m emission is attributed to the larger probabilities of the cross relaxation processes S-4(3/2) + I-4(15/2) -> I-4(9/2) + I-4(13/2) (Er), S-4(3/2) + I-4(15/2) -> I-4(13/2) + I-4(9/2) (Er) and I-4(9/2) + I-4(15/2) -> I-4(13/2) + I-4(13/2) (Er) induced by Er3+ cluster sites. (C) 2011 Elsevier B.V. All rights reserved.
