Kinetics of Tb3+ and Dy3+ levels populations in chalcogenide glasses pumped near the fundamental absorption band edge
Yulia S.Kuzyutkina,1, Nina D.Parshina, 1, Elena A.Romanova,1, Vyacheslav I. Kochubey,1, Maksim V.Sukhanov,2, Vladimir S.Shiryaev, 2 1 Saratov State University, Saratov, Russia 2 Institute of Chemistry of High Purity Substances of RAS, Nizhny Novgorod, Russia
Abstract
Chalcogenide glasses doped with rare earth (RE) elements are of interest for creation of lasers and broadband sources for mid-IR spectral range. The fundamental absorption band edge of a chalcogenide host glass consists of the Urbach tail and of the weak absorption tail and can overlap with some transitions of RE ions in the visible or near-IR. Interaction between a host glass and dopants can influence excitation and emission processes in the ions. In this work, we present results of spectroscopic studies of chalcogenide glasses of the system Ge-Sb-Ge-Se doped with Tb3+ and Dy3+ in the range of wavelengths of 0.5 – 1.5 microns. It was revealed that absorption bands of Dy3+ could overlap with the weak absorption tail of the host glass. In this case, energy transfer between the RE ions and gap states is possible. Moreover the gap states density depends on the RE ions concentration. We refer this problem by solution of the system of kinetic equations for Tb3+ and Dy3+ levels populations with account of the energy transfer process for the Dy3+ doped glass. The kinetics are analysed comparatively for various pumping power and RE ions concentration.
Speaker
Yu.S.Kuzyutkina
Saratov State University
Russia
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