科研之友
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摘要
A new Er3+/Yb3+-codoped fluorphosphate glass was prepared by high temperature melting. Its density, absorption spectra, and fluorescence spectra were measured and investigated. The effect of Er3+ and Yb3+ concentrations on the spectroscopic properties of the glass sample are discussed. A Judd-Ofelt theory analysis on the absorption spectra was performed. The oscillator strengths were Omega(t) (t=2, 4, 6), Omega(2)=4.36x10(-20) cm(2), Omega(4)=1.35x10(-20) cm(2), and Omega(6)=0.79x10(-20) cm(2). The lifetime (T-m) of the (4)/(13/2) level for the Er3+ ions was 8.26 ms and the full width at half maximum (FWHM) of the main emission peak was 68 nm at 1.53 mu m. The large stimulated emission cross-section (sigma(e)=8.5x10(-21) cm(2)) of the Er3+ was calculated using McCumber theory. The spectroscopic properties of the Er3+ ion were compared among different glasses. The FWHM and sigma(e) of Er3+/Yb3+-codoped fluorphosphate glass were found to be larger than those of other glass hosts, which indicates that this glass may be a potentially useful candidate material host for a high-gain erbium-doped fiber amplifier.
