title: Enhanced broadband near-infrared emission and energy transfer in Bi-Tm-codoped germanate glasses for broadband optical amplification.
abstract: Bi-Tm-codoped, and Tm- and Bi- singly doped germanate glasses were prepared, and their luminescent properties were investigated. Intense broadband near-IR emission with FWHM of 300 nm was observed in the Bi-Tm codoped glass. The emission intensity of Tm(3+):(3)H(4)-(13)F(4) and (3)F(4)-(13)H(5) transitions in the Bi-Tm-codoped glass was highly increased and reduced, respectively. The fluorescence lifetime of Tm(3+) at 1470 nm increased from 204 micros to 301 micros after codoping. These should be due to the efficient energy transfer from Bi-related centers to Tm(3+) ions. The highest energy transfer efficiency is estimated to be approximately 50%.
authors.affiliation: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, ChineseAcademy of Sciences, Shanghai 201800, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Ruan
authors.forename: Guoping
authors.initials: G
authors.lastname: Dong
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Liu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.forename: Danping
authors.initials: D
authors.lastname: Chen
authors.forename: Jianrong
authors.initials: J
authors.lastname: Qiu