Abstract

Er3+ green upconversion (UC) emission corresponding to the transition of S324(H1122)I1524 is enhanced in a ErDy-codoped LiNbO3 crystal compared with Er-doped LiNbO3 under 800nm femtosecond-laser excitation at room temperature. The upconversion mechanisms are proposed based on spectral, kinetic, and pump-power dependence analyses. The energy-transfer efficiency from Dy3+(F924) to Er3+(F724) is 33%, which results in the enhancement of green UC emission. This energy transfer is advantageous for the Er3+ UC emission sensitized by Dy3+, especially in a low-phonon-energy host matrix.

© 2008 Optical Society of America

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