title: 2 μm emission properties and nonresonant energy transfer of Er3+and Ho3+codoped silicate glasses.
abstract: 2.0 μm emission properties of Er3+/Ho3+codoped silicate glasses were investigated pumped by 980 nm LD. Absorption spectra were determined. Intense mid-infrared emissions near 2 μm are observed. The spectral components of the 2 μm fluorescence band were analyzed and an equivalent model of four-level system was proposed to describe broadband 2 μm emission. Low OH-absorption coefficient (0.23 cm-1), high fluorescence lifetime (2.95 ms) and large emission cross section (5.61 × 10-21cm2) corresponding to Ho3+:5I7→5I8transition were obtained from the prepared glass. Additionally, energy transfer efficiency from the Er3+:4I13/2to the Ho3+:5I7level can reach as high as 85.9% at 0.75 mol% Ho2O3doping concentration. Energy transfer microscopic parameters (CDA) via the host-assisted spectral overlap function were also calculated to elucidate the observed 2 μm emissions in detail. Moreover, the rate equation model between Er3+and Ho3+ions was developed to elucidate 2 μm fluorescence behaviors with the change of Ho3+concentration. All results reveal that Er3+/Ho3+codoped silicate glass is a promising material for improving the Ho3+2.0 μm fiber laser performance.
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, P.R. China.
authors.forename: Ruijie
authors.initials: R
authors.lastname: Cao
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, P.R. China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Lu
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, P.R. China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Tian
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, P.R. China.
authors.forename: Feifei
authors.initials: F
authors.lastname: Huang
authors.affiliation: Collage of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, P.R. China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Guo
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, P.R. China.
authors.forename: Shiqing
authors.initials: S
authors.lastname: Xu
authors.affiliation: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, P.R. China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Zhang