Abstract
Room temperature emission and absorption spectra corresponding respectively to the 4I13/2 ↔ 4I15/2 transitions of the Er3+ in oxyfluoride glass-ceramics, 32(SiO2) 9(AlO1.5) 31.5(CdF2) 18.5(PbF2) 5.5(ZnF2): 3.5(ErF3) mol%, and its parent precursor glass, have been measured. The concentration of Er3+ ions has been estimated at 1.06 × 1021 ions/cm3 from a molar density measurement. The radiative lifetime τrad of the emitting level 4I13/2 was obtained from the experimental absorption oscillator strength. The stimulated emission cross-section has been calculated based on the experimental spontaneous emission spectrum using the Füchtbauer-Ladenburg equation. Using the measured absorption and calculated stimulated emission cross-sections, the wavelength dependence of the net gain cross-section, as a function of population inversion of the excited 4I13/2 and ground 4I15/2 states, has been computed. In the glass-ceramic sample, gain was found to be almost flat in the range 1.50 to 1.56 μm, corresponding to S- and C-bands of telecommunications, for population inversion between 0.8 to 1.0. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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