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Abstract: This work reports the observation of emissions at 2.9μm, 1.8μm and 1.47μm from Dy3+/Tm3+ codoped fluorophosphate glass upon excitation of a conventional 800nm laser diode. Judd–Ofelt intensity parameters and radiative properties of Dy3+ ions in present glasses were calculated using the Judd–Ofelt theory. The mechanism and microparameters of energy transfer processes were investigated based on photoluminescence performance and lifetime measurements. The Dy3+/Tm3+ codoped fluorophosphate glass possessing advantageous spectroscopic characteristics as well as excellent thermal stability is a promising candidate for an efficient 2.9μm laser. [Copyright &y& Elsevier]

Abstract: 2.84μm luminescence with a bandwidth of 213nm is obtained in Dy3+ doped (ZrF4–BaF2–LaF3–AlF3–YF3) ZBLAY glass. Three intensity parameters and radiative properties have been determined from the absorption spectrum based on the Judd–Ofelt theory. The 2.84μm emission characteristics and energy transfer mechanism upon excitation of a conventional 808nm laser diode are investigated. The prepared Dy3+ doped ZBLAY glass possessing high predicted spontaneous transition probability (45.92s−1) along with large calculated emission cross section (1.17×10−20 cm2) has potential applications in 2.8μm laser. [Copyright &y& Elsevier]