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Antiresonances in the excitation and absorption spectra of Cr3+-doped fluoride glasses.

Absorption and excitation spectra of Cr 3+ -doped fluoride glasses exhibit features that can be interpreted as Fano antiresonance lines due to interactions between the 2 E, 2 T 1 sharp levels and the vibrationally broadened 4 T 2 quasicontinuum. A study of the influence of glass inhomogeneity on the antiresonace profiles of Cr 3+ time-resolved laser-excitation spectra at 4.2 K was performed for four fluoride glasses. The Fano theory adapated by Sturge, Guggenheim, and Pryce has also been used to develop a method to analyze the change of the resonance-line-shape parameter q as a function of the peak position and half width of the background absorption spectrum