UV-visible-NIR light generation through frequency upconversion in Tm3+-doped low silica calcium aluminosilicate glasses using multiple excitation around 1.2 µm

Publication date: Available online 2 February 2018 Source:Journal of Solid State Chemistry Author(s): C.M. Trindade, F.G. Rego-Filho, N.G.C. Astrath, C. Jacinto, A.S. Gouveia-Neto Intense ultraviolet upconversion emission was produced in single Tm3+-doped OH--free low silica calcium aluminosilicate glasses. A new excitation route based upon multi-Stokes Raman emissions generated in an optical fiber pumped at 1.064µm, and exploiting the absorption band around 1.2µm by means of the 3H5 thulium excited state, was used. Furthermore, the other bands of the stimulated Raman scattering spectrum resonantly enhances all the upconversion processes, resulting in efficient ultraviolet (295nm, 360nm), blue (456nm, 480nm), red (650nm, 667nm), and near-infrared (800nm) emissions. The population of the 1P0, 1D2, 1G4, 3F2 and 3H4 excited-state emitting levels was accomplished through stepwise multi-photon absorption. Results indicate competing cross-relaxation processes involving Tm3+ ion-pairs producing UV emission population quenching Graphical abstract

Source: Journal of Solid State Chemistry - February 3, 2018 Category: Chemistry Source Type: research