title: Spectroscopic properties and energy transfer analysis of Tm3+-doped BaF2-Ga2O3-GeO2-La2O3 glass.
abstract: This paper reports on the spectroscopic properties and energy transfer analysis of Tm(3+)-doped BaF(2)-Ga(2)O(3)-GeO(2)-La(2)O(3) glasses with different Tm(2)O(3) doping concentrations (0.2, 0.5, 2.0, 2.5, 3.0, 3.5, 3.5, 4.0 wt%). Mid-IR fluorescence intensities in the range of 1,300 nm-2,200 nm have been measured when excited under an 808 nm LD for all the samples with the same pump power. Energy level structure and Judd-Ofelt parameters have been calculated based on the absorption spectra of Tm(3+), cross-relaxation rates and multi-phonon relaxation rates have been estimated with different Tm(2)O(3) doping concentrations. The maximum fluorescence intensity at around 1.8 mum has been obtained in Tm(2)O(3)-3 wt% sample and the maximum value of calculated stimulated emission cross-section of Tm(3+) in this sample is about 0.48 x 10(-20) cm(2) at 1,793 nm, and there is not any crystallization peak in the DSC curve of this sample, which indicate the potential utility of Tm(3+)-doped BaF(2)-Ga(2)O(3)-GeO(2)- La(2)O(3) glass for 2.0-microm optical fiber laser.
authors.affiliation: Institute of Optical Communication Materials, Key Laboratory of Special Functional Materials of Ministry of Education, South China University of Technology, Guangzhou 510641, People's Republic of China.
authors.forename: Shenglei
authors.initials: S
authors.lastname: Yu
authors.forename: Zhongmin
authors.initials: Z
authors.lastname: Yang
authors.forename: Shanhui
authors.initials: S
authors.lastname: Xu
mesh_terms: D003460:Crystallization; D004735:Energy Transfer; D005453:Fluorescence; D005857:Germanium; D005898:Glass / Q000737:chemistry*; D007834:Lasers; D013057:Spectrum Analysis
chemical_list: D005857:Germanium; C040516:germanium oxide