title: Enhanced efficiency of Er:Yb:Ce:NaGd(WO4)2 laser at 1.5-1.6 microm by the introduction of high-doping Ce3+ ions.
abstract: By the introduction of high-doping Ce3+ ions, the upconversion fluorescence of Er3+ ions was reduced, and the energy-transfer efficiency from Yb3+ to Er3+ ions was enhanced significantly in Er:Yb:Ce:NaGd(WO4)2 crystals. End pumped by a diode laser at 970 nm in a hemispherical cavity, a 2.0 W quasi-cw laser at 1.5-1.6 microm with slope efficiency of 19% and absorbed pump threshold of 2.0 W was achieved in a 1.7-mm-thick c-cut Er:Yb:Ce:NaGd(WO4)2 crystal. The results show that the Er.:Yb:Ce:NaGd(WO4)2 crystal with high-doping Ce3+ ions is a potential gain medium for a low-threshold 1.5-1.6 microm laser.
authors.forename: Jianhua
authors.initials: J
authors.lastname: Huang
authors.forename: Yujin
authors.initials: Y
authors.lastname: Chen
authors.forename: Yanfu
authors.initials: Y
authors.lastname: Lin
authors.forename: Xinghong
authors.initials: X
authors.lastname: Gong
authors.forename: Zundu
authors.initials: Z
authors.lastname: Luo
authors.forename: Yidong
authors.initials: Y
authors.lastname: Huang