Mid-infrared fluorescence of Y2O3 and Nb2O5 modified germanate glasses doped with Er3+ pumped by 808 nm LD

• Er3+ doped Y2O3 and Nb2O5 modified germanate glasses were prepared.
• Spectroscopic properties and energy transfer mechanism were studied.
• Non-radiative relaxation rates and energy transfer microparameters were calculated.
• The prepared samples have potential applications in mid-infrared lasers.

Er3+ doped germanate glasses modified by Y2O3 and Nb2O5 have been prepared. A detailed discussion of J–O parameters has been carried out based on absorption spectra and Judd–Ofelt theory. Mid-infrared transmittance spectra and 2.7 μm emission properties have been investigated. To understand 2.7 μm fluorescence behaviors, 1.53 μm emission spectra, radiative lifetimes, non-radiative relaxation rate constants of the 4I11/2 → 4I13/2 transition and energy transfer coefficients of 4I13/2 level have been obtained and discussed. As a result, the investigated samples with excellent spectroscopic properties might be appropriate optical materials for mid-infrared laser and amplifier applications.

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