【摘 要】
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A complete set of spectroscopic parameters, including Judd-Ofelt parameters, radiative transition probabilities,radiative lifetime, branching ratios and integra
【机 构】
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Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
论文部分内容阅读
A complete set of spectroscopic parameters, including Judd-Ofelt parameters, radiative transition probabilities,radiative lifetime, branching ratios and integrated absorption cross section, have been calculated for Tm3+- dopedfluoroaluminate (AYF) glass, based on the measured absorption spectra. The mechanism of Tm3+ →Tm3+ andYb3+ Tm3+ energy transfers and fluorescence properties have been investigated in both Tm3+ single-doped andYb3+/Tm3+ double-doped AYF glasses. The cross-relaxation process, 3F4 +3H6→23H4, is proved, which makes theoptimum Tm3+ concentration of 1.77μm fluorescence (3H4→3H6) much higher than 1.45μm fluorescence (3F4→3H4) inTm3+:AYF glasses. In Yb3+/Tm3+:AYF glasses, a stronger concentration quenching is found for the 476nm emissionthan that for the 797nm emission, and is discussed under the 970nm-excitation.
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