Upconversion Luminescence in Yb3+//Tm3+Yb^{3+}//Tm^{3+} Doped Double Clad Optical Fibre

The paper presents luminescence properties of telluride glass doped with $Yb^{3+}//Tm^{3+}$ ions. Strong blue emission at 477 nm corresponding to the transition $\text{}^1 G_4 \rightarrow \text{}^3 H_6$ in thulium ions was measured under the excitation of a 976 nm diode laser. The dependence of the upconversion emission upon the thulium ions concentration was studied in order to determine the optimal ion content. The results showed that intensity of upconversion emission enhances, with the increase of $Tm^{3+}$ content up to 0.1 mol.%. The most effective energy transfer $Yb^{3+} \rightarrow Tm^{3+}$ occurs in the glassy matrix with molar ratio of dopant 1 $Yb^{3+}$ : 0.1 $Tm^{3+}$. Double-clad optical fibre was made of glass with the highest upconversion intensity at the wavelength of λ = 477 nm (TGPF101). As a result of optical excitation (λ = 976 nm) of the produced optical fibre, an additional emission line, which was not noticed in the glass, was observed at the wavelength of 351 nm corresponding to the $\text{}^1 D_2 \rightarrow \text{}^3 H_6$ transition

Color-Tunable Upconversion Luminescence in Er3+-Yb3+ -codoped Sodium Lutetium Fluoride Glass-ceramics

Trabajo presentado en el 21st International Conference on Transparent Optical Networks (ICTON), celebrado en Angers (Francia), del 9 al 13 de julio de 2019In this work, the study of the near infrared to visible upconversion (UC) emission in transparent sodium lutetium fluoride glass-ceramics doped with ErF 3 and co-doped with YbF 3 is reported. Intense UC green and red emissions due to ( 2 H 11/2 , 4 S 3/2 ) →4 I 15/2 and 4 F 9/2 →4 I 15/2 transitions respectively together with a more weak blue emission due to the 2 H 9/2 →4 I 15/2 transition have been observed under excitation at 980 nm. The influence of Yb 3+ co-doping and excitation power density on the upconversion emissions is investigated. The addition of Yb 3+ ions greatly enhances the overall UC emission intensity and can be used to tune the UC emission from green to yellow due to an increase of the red-to-green ratio

Oxyfluoride transparent glass-ceramics: a promising family of materials for photonic applications

Resumen del trabajo presentado al Laser Congress 2017, celebrado en Nagoya, Aichi (Japón) del 1 al 5 de octubre de 2017.Transparent oxyfluoride glass-ceramic fibers containing Nd3+doped- LaF3 nano-crystals were drawn using single crucible method and crystallized before cladding deposition. Optical fibers with Nd-NaGdF4 were also prepared by double crucible method with AR glass cladding. The fibers were characterized from a structural and optical point of view.Peer reviewe