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中文摘要：
采用高温熔融急冷法制备了系列Er3＋/Tm3＋共掺杂的Ga5Ge20Sb10S65玻璃,测试了样品的吸收光谱,以及分别在980 nm和800 nm LD激发下样品的荧光光谱。运用Judd-Ofelt理论计算了Er3＋离子在Ga5Ge20Sb10S65玻璃中的强度参数Ωi（i=2,4,6）、自发辐射跃迁几率A和辐射寿命τ等光谱参数。掺杂Tm3＋离子主要是为了降低Er3＋：4I13/2的能级寿命,这是因为Er3＋：4I13/2→Tm3＋：3F4两个能级之间发生了能量传递,从而增加Er3＋离子在4I11/2能级与4I13/2能级之间发生粒子数反转的可能。结果表明,Er3＋/Tm3＋共掺杂Ga5Ge20Sb10S65玻璃随着Tm3＋离子浓度的增加,2.76μm处的中红外荧光先增强,然后有所减弱。
英文摘要：
Er3＋/Tm3＋-codoped Ga5Ge20Sb10S65 glasses were prepared by traditional melt-quenching method.Fluorescence spectra were investigated under 980 nm and 800 nm LD excitation.Combined with their absorption spectra,the Judd-Ofelt intensity parameters Ωi（i=2,4,6）,spontaneous transition probabilities A and rediative lifetomes τ for Er3＋ ion were calculated by Judd-Ofelt theory.Due to the energy transfer from 4I13/2 of Er3＋ to 3F4 of Tm3＋,the addition of Tm3＋ significantly reduced the lifetime of the 4I13/2 level of Er3＋,that in turn increase the possibility of population inversion between the 4I11/2 and 4I13/2 levels of Er3＋.It is learned that the intensity of 2.76 μm mid-infrared fluorescence firstly increased,and then dropped in the Er3＋/Tm3＋-doped Ga5Ge20Sb10S65 glasses with the increase of Tm3＋ ion concentration.
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