Abstract
Thermally stable ZrF4-based glasses with Pr3+ :1G4 →3H5 fluorescence lifetimes longer than that of conventional ZBLAN glass have been developed. In addition to lifetime measurements the transmission characteristics, absorption spectra, 1.3 μm emission spectra and refractive indices of these novel glasses were determined. Fourier transform infrared reflectance and phonon sideband spectra suggest that the prolonged lifetimes are due to a reduction in the phonon energy in the vicinity of Pr3+ ions and a decrease in the electron-phonon coupling strength.
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