Abstract
green upconversion (UC) emission corresponding to the transition of is enhanced in a -codoped crystal compared with Er-doped under 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 to is 33%, which results in the enhancement of green UC emission. This energy transfer is advantageous for the UC emission sensitized by , especially in a low-phonon-energy host matrix.
© 2008 Optical Society of America
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