摘要
The Zn/Er/Yb:LiNbO3 and Er/Yb:LiNbO3 crystals were grown by the Czochralski technique. The laser characteristics of 1.54 渭m emission were predicted based on the Judd-Ofelt theory, and the intensity parameters 惟t (惟2=7.23脳10鈭?0 cm2, 惟4=3.15脳10鈭?0 cm2 and 惟6=1.43脳10鈭?0 cm2) were obtained. The stimulated emission cross sections (蟽em) at 1.54 渭m emission in Zn/Er/Yb:LiNbO3 were calculated based on the McCumber theory and the F眉chtbauer-Ladenburg theory. The gain cross section spectrum of Zn/Er/Yb:LiNbO3 crystal was also investigated. Under 980 nm excitation, a lenghthening lifetime of 1.54 渭m emission and an enhancement of green upconversion emission were observed for Zn/Er/Yb:LiNbO3 crystal. The studies on the power pump dependence and the upconversion mechanism suggested that both green and red upconversion emissions were populated via the three-photon process, and Zn2+ ion tridoping increases the probability of cross relaxation process between the two neighboring Er3+ ions.