title: Enhancement of 1.53  μm emission in erbium/cerium-doped germanosilicate glass pumped by common 808  nm laser diode.
abstract: Erbium-doped germanosilicate glasses with various cerium ions contents have been prepared. Optical absorption and 1.53 μm emission spectra were measured to characterize the spectroscopic performances of prepared samples. A detailed study of 1.53 μm spectroscopic properties was carried out when pumped by an 808 nm laser diode. Moreover, an energy level diagram and an energy transfer mechanism between Er3+ and Ce3+ were proposed to elucidate the enhanced 1.53 μm fluorescence. It is found that the prepared samples have optimal spectroscopic properties when the Ce3+ concentration is fixed to 0.5 mol. %. High spontaneous radiative transition probability (172.66  s(-1)), large effective emission bandwidth (74 nm), and emission cross section (9.49×10(-21)  cm(2) indicate that 808 nm pumped Er3+/Ce3+ codoped germanosilicate glass might be a suitable material for a broadband optical amplifier.
authors.forename: Ying
authors.initials: Y
authors.lastname: Tian
authors.forename: Tao
authors.initials: T
authors.lastname: Wei
authors.forename: Muzhi
authors.initials: M
authors.lastname: Cai
authors.forename: Fangze
authors.initials: F
authors.lastname: Chen
authors.forename: Fengchao
authors.initials: F
authors.lastname: Wang
authors.forename: Xufeng
authors.initials: X
authors.lastname: Jing
authors.forename: Junjie
authors.initials: J
authors.lastname: Zhang
authors.forename: Qinyuan
authors.initials: Q
authors.lastname: Zhang
authors.forename: Shiqing
authors.initials: S
authors.lastname: Xu