The primary excited state decay processes relating to the laser transition in singly -doped fluoride (ZBLAN) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the , energy levels at 1125 nm and , energy levels at 1358 nm established that the energy levels above the level, excluding the level, are entirely quenched by multiphonon emission in ZBLAN glass. The and energy levels emit luminescence with peaks at and , respectively, but at low quantum (luminescence) efficiencies. The quantum efficiency of the level and level is and , respectively, for based on calculations of the radiative lifetimes using the Judd–Ofelt theory. Excited state absorption (ESA) was detected by monitoring the rise time of the 1700 nm luminescence after tuning the probe wavelength across the spectral range from 1100 to 1400 nm. As a result of nonradiative decay of the higher excited states, ESA contributes to the heating of fiber lasers based on -doped fluoride glass. For up to 4 mol %, we found no evidence of energy transfer processes between ions that influence the decay characteristics of the and energy levels.
Energy level decay and excited state absorption processes in dysprosium-doped fluoride glass
Laércio Gomes, André Felipe Henriques Librantz, Stuart D. Jackson; Energy level decay and excited state absorption processes in dysprosium-doped fluoride glass. J. Appl. Phys. 1 March 2010; 107 (5): 053103. https://doi.org/10.1063/1.3311561
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