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Thermally induced threefold upconversion emission enhancement in nonresonant excited Er3+/Yb3+-codoped chalcogenide glass

1999; American Institute of Physics; Volume: 74; Issue: 24 Linguagem: Inglês

10.1063/1.123196

1520-8842

P. V. dos Santos, E. A. Gouveia, M. T. de Araújo, A.S. Gouveia-Neto, A. S. B. Sombra, J. A. Medeiros Neto,

Solid State Laser Technologies

Thermally induced threefold infrared-to-visible upconversion emission enhancement in Er3+/Yb3+-codoped Ga2S3:La2O3 chalcogenide glasses excited at 1.064 μm is reported. The times three upconversion efficiency enhancement was achieved by heating the sample in the temperature range of 23–155 °C, and is assigned to the temperature-dependent multiphonon-assisted anti-Stokes sideband excitation process of the ytterbium sensitizer. A theoretical analysis based upon rate equations considering the sensitizer absorption cross section as a function of the phonon occupation number in the host material exhibited very good agreement with experimental data.