A broad look into the spectroscopy of GaLaS chalcogenide glass doped with Nd³⁺

De Camargo, A.S.S., Nunes, L.A.de Oliveira, Lima, S.M., Catunda, T. and Hewak, D. (2002) A broad look into the spectroscopy of GaLaS chalcogenide glass doped with Nd³⁺. XXV Encontro Nacional de Fisica da Materia Condensa, Brazil. 06 - 09 May 2002.

Abstract

Interesting characteristics such as low phonon energy, large refractive index, transparency in the near and mid infrared and high covalence in bonding make chalcogenide glasses very attractive materials for rare earth (RE) doped lasers and optical amplifiers. Moreover, these glasses present a photodarkening effect that allows their application as planar waveguides and gratings. Laser action has already been observed in GaLaS: Nd³⁺ glass in the bulk and fiber forms and the presence of structural defects and their possible influence on the quantum efficiency of Nd³⁺ at the laser transition in 1.08 µm (⁴F_3/2 to ⁴I_11/2) has been investigated by a combination of thermal and optical spectroscopic measurements.

Aiming to extend the studies on the host-ion interactions and to characterize ion-ion energy transfer processes that could result in losses for the laser emission, this work presents novel spectroscopic results and the calculations of energy transfer probabilities from Nd³⁺ level ⁴F_3/2 using Dexter and Kushida model of multipolar interactions. Absorption, excitation and fluorescence measurements in the visible and infrared regions reveal interesting characteristics of energy transfer from the host to the ion and also ion-host back transfer. In the near infrared region site selective spectroscopic results point out the presence of different Nd³⁺ sites and lifetime measurements of level ⁴F_3/2 were done as a function of doping concentration. The values of the microscopic energy transfer parameters Cda associated to the cross relaxation ⁴F_3/2, ⁴I_9/2 to ⁴I_15/2, ⁴I_15/2 and Cdd associated to the energy migration ⁴F_3/2, ⁴I_9/2 to ⁴F_3/2, ⁴I_9/2 obtained by Dexter and Kushida models are in very good agreement.

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Contributors

Author: D. Hewak

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