Abstract
A comprehensive investigation on Cr3+ → Ho3+ energy transfer has been comparatively carried out in Ho3+-doped, Cr3+-doped and Cr3+/Ho3+ co-doped fluorogermanate glasses. Steady and dynamic luminescence spectra of the glass samples are detected under excitation of static/microsecond-pulsed xenon lamps and an 808 nm laser diode, respectively. Through strong sensitization of Cr3+, the 2.0 μm emission of Ho3+: 5I7 → 5I8 can be efficiently achieved in an extremely extended excitation band of 325-830 nm. The energy transfer mechanisms involved are rationally discussed in detail for Cr3+/Ho3+ co-doping. On the basis of theoretical and experimental data, the energy transfer efficiency of Cr3+ → Ho3+ is appropriately calculated to be 26.2%. This novel Cr3+/Ho3+ codoping system could provide the experimental basis for obtaining 2.0 μm laser flexibly pumped by the xenon lamp or the 808 nm laser diode.
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