Abstract
Emission properties of Ho 3+ at 2.0 μm and the energy transfer mechanism between Yb 3+, Er 3+ and Ho 3+ ions in fluorophosphate glasses are investigated. The measured emission spectra show that the 5 I 7 → 5 I 8 transition of Ho 3+ upon 980 nm laser diode excitation is strong. Judd–Ofelt intensity parameters ( Ω λ , λ = 2, 4, 6), spontaneous transition probability ( A rad), radiative lifetime ( τ r), absorption cross section ( σ a), stimulated emission cross section ( σ e) and FWHM × σ e peak for the transition of Ho 3+: 5 I 7 → 5 I 8 are calculated and discussed. The obtained results show that the present Yb 3+/Er 3+/Ho 3+ triply-doped fluorophosphate glass can be identified to be a promising material at 2.0 μm emission.
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