Design of high gain optical Amplifier materials by control of 4f erectronic transition probability of rare earth doped glasses

如果在1.5毫米和1.3毫米波上开发光学放大器的玻璃材料，则在光纤电信、Er^<3+>、Pr^<3+>或Dy^<3+>中使用了若干玻璃及其对光学性能的主机依赖。首先是Judd-Ofelt强度参数、局部结构和1.5 mm Luminescence Characteristics of Er^<3+> ions对各种铝含量的铝氧化玻璃进行了调查。从^4 I_<13/2>级是由Judd-Ofelt分析确定的，非放射性衰变率是由终生测量组合在一起的。随着Al_2O_3含量增加了多重信号衰减率，可以通过在声子侧带中观察到电子信号耦合强度的衰减来解释，当发射概率^4 I_<13/2>*^4 I_<15/2>增加了1.5毫米发射的量子有效性，从70%到几乎90%。结果是否定的 ... More cussed in terms of the change in the local structure and orbital electron of Er^<3+> ions with the structural evManagement of the glass。Concentration and temperature dependences of fluorescence of Pr^<3+\： ^1 G_4 *^\>H_5 and Yb^<3+\： ^2 F_<5/2>*^2 F_<7/2> were investigated in tellurite glasses doped with up to 6 mol%Yb_2 O_3。通过970纳米泵，Pr^<3+>的1.3毫米发射被敏感化。1.02毫米发射从Yb^<3+>的生命中捕获的寿命被1.02毫米发射在一个单一剂量的玻璃中不敏感。However，Yb-Life-time显示了强烈的集中性，仅在0.1mol%Pr_2O_3中。从Yb到Pr的能量转移在一个合适的玻璃中发现的能量转移效率超过90%，甚至在玻璃中[Yb]/[Pr]>100。Yb-在单剂量的玻璃中被稀释的生命周期，在编码的玻璃中被稀释的温度。These results can be\ained by assumming rapid energy migration between Yb^<3+>·^2 F_<5/2>*Pr^<3+> ： ^1 G_4 transfer at higher temperature。Less（低）

In order to develop the glass materials for optical amplifiers at 1.5mum and 1.3mum wavelengths, which are used in fiber telecommunications, Er^<3+>, Pr^<3+>, or Dy^<3+> ions were doped in several glasses and their host dependence of optical properties were investigated. Firstly the Judd-Ofelt intensity parameters, local structure and 1.5mum luminescence characteristics of Er^<3+> ions were investigated in the aluminosilicate glasses with various aluminum contents. Radiative decay rate from ^4I_<13/2> level was determined by Judd-Ofelt analyzes and nonradiative decay rate was obtained combined with the lifetime measurement. With increasing Al_2O_3 content the multiphonon decay rate decreased, which could be explained by the decrease of electron-phonon coupling strength observed in the phonon sideband spectra, whereas the emission probability of ^4I_<13/2>*^4I_<15/2> increased Accordingly the quantum efficiency of 1.5mum emission were enhanced from 70% to almost 90%. The results are dis … More cussed in terms of the change in the local structure and orbital electron density of Er^<3+> ions with the structural evolution of the glass.Concentration and temperature dependences of fluorescence of Pr^<3+> : ^1G_4*^<>H_5 and Yb^<3+> : ^2F_<5/2>*^2F_<7/2> were investigated in tellurite glasses doped with up to 6mol% Yb_2O_3. By 970nm pumping, the 1.3mum emission of Pr^<3+> was sensitized.The lifetime obtained by 1.02mum emission from the Yb^<3+>ions at room temprature was insensitive to the Yb_2O_3 concentration in singly doped glasses. However, the Yb-life-time showed strong concentration quenching with the presence of only 0.1mol% Pr_2O_3. The energy transfer efficiency from Yb to Pr in a codoped glass was found to be more than 90% even in the glass of[Yb]/[Pr]>100. The Yb-lifetime in singly doped glass increased and that in codoped glass decreased with increasing temperature. These results can be explained by assuming rapid energy migration between Yb ions and promotion of Yb^<3+>・^2F_<5/2>*Pr^<3+> : ^1G_4 transfer at higher temperature. Less