title: Preparation of Ho3+/Tm3+Co-doped Lanthanum Tungsten Germanium Tellurite Glass Fiber and Its Laser Performance for 2.0 μm.
abstract: Ho3+/Tm3+co-doped 50TeO2-25GeO2-3WO3-5La2O3-3Nb2O5-5Li2O-9BaF2glass fiber is prepared with the rod-tube drawing method of 15 μm core diameter and 125 μm inner cladding diameter applied in the 2.0 μm-infrared laser. The 2.0 μm luminescence properties of the core glass are researched and the fluorescence intensity variation for different Tm3+doping concentration is systematically analyzed. The results show that the 2.0 μm luminescence of Ho3+is greatly influenced by the doping concentration ratio of Ho3+to Tm3+and that the maximum fluorescence intensity of the core glass can be obtained and its emission cross section can reach 0.933 × 10-21cm2when the sensitized proportion of holmium to thulium is 0.3 to 0.7 (mol%). Simultaneously, the maximum phonon energy of the core glass sample is 753 cm-1, which is significantly lower than that of silicate, gallate and germanate glass and the smaller matrix phonon energy can be conductive to the increase 2.0 μm-band emission intensity. The continuous laser with the maximum laser output power of 0.993 W and 2051 nm -wavelength of 31.9%-slope efficiency is output within the 0.5 m glass fiber and the experiment adopts 1560 nm erbium-doped fiber laser(EDFL) as the pump source and the self-built all-fiber laser. Therefore, the glass fiber has excellent laser characteristics and it is suitable for the 2.0 μm-band laser.
authors.affiliation: School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China.
authors.forename: Dechun
authors.initials: D
authors.lastname: Zhou
authors.affiliation: School of Electronic Information Engineering, Changchun University of Science and Technology, Changchun, 130022, China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Bai
authors.affiliation: School of Electric Power, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Hang
authors.initials: H
authors.lastname: Zhou