Author/Authors :
Zhang، نويسنده , , Xiao and Yuan، نويسنده , , Jianhui and Liu، نويسنده , , Xingren and Jouart، نويسنده , , Jean Pierre and Mary، نويسنده , , Gérard، نويسنده ,
Abstract :
Efficient upconversion fluorescence from an Er3+ center in Ca3Al2Ge3O12 has been observed, upon pumping with a single red dye laser. The mechanism for the blue upconversion is either a sequential three-photon absorption or an energy transfer process depending on the laser energy being tuned on either the excited state absorption or the ground state absorption transitions. Owing to a double resonant excited state absorption transition character, the three-photon blue upconversion efficiency is relatively high.
