电感耦合等离子体质谱法测定高纯氧化铒中14种稀土杂质

用电感耦合等离子体质谱研究了直接测定９９．９９９％Ｅｒ２Ｏ３中１４个稀土杂质的含量。采用基体匹配法扣除Ｅｒ和Ｈｏ和Ｔｍ元素的基体峰背景干扰，选择同位素Ｅｒ＾１６２为内标，可显著提高测量精度和准确度。     

高氯酸铒与蛋氨酸配合物的合成及结构研究

在水溶液中合成了标题配合物，其化学式为Ｅｒ（Ｍｅｔ）２（ＣｌＯ４）３·４．５Ｈ２Ｏ（Ｍｅｔ为蛋氨酸）．研究了配合物的红外光谱．用Ｘ射线单晶衍射法测定了配合物的晶体结构，结果表明，其结构式为［Ｅｒ２（ＤＬ－Ｍｅｔ）４·８Ｈ２Ｏ］·（ＣｌＯ４）６·Ｈ２Ｏ．属单斜晶系，空间群为Ｐ２１／ｎ，晶胞参数为：ａ＝１３．８４６（５）Ａ，ｂ＝２１．７９４（７）Ａ，Ｃ＝１９．１３１（５），β＝９０．５１（３）°，Ｖ＝５７７２．８４（３）３，Ｚ＝４．每两个Ｅｒ原子之间通过四个蛋氨酸的羧基桥相连而形成双核配合物．两对对位的蛋氨酸中，其中一个为Ｌ型，而另一个为Ｄ型．每个Ｅｒ原子还与四个水分子配位，其配位数为８．对于每个双核离子而言，其配位多面体由两个四方反棱柱体组成．     

波分复用全光通信网中的放大自发辐射噪声积累效应研究

给出了一种全光通信网波长域计算机模拟方法，模拟了波分复用信号经过３个光分插复用节点后的信号及放大自发辐射积累的光谱图，并与实验结果进行了对比。计算了波分复用信号经过５０个光分插复用节点极限情况下的信噪比，结果表明放大自发辐射噪声积累造成的信噪比下降仍然可以保证接收机在１０Ｇｂ／ｓ时的误码率小于１０＾－９。这些结果可以被应用到未来国家或地区级全光通信网中。     

Immobilization of cerium (IV) and erbium (III) in mesoporous MCM‐41: Two novel and highly active heterogeneous catalysts for the synthesis of 5‐substituted tetrazoles,and chemo‐ and homoselective oxidation of sulfides

Two well‐ordered 2D ‐ hexagonal cerium (IV) and erbium (III) embedded functionalized mesoporous MCM ‐ 41(MCM‐41@Serine/Ce and MCM ‐ 41@Serine/Er) have been developed via functionalization of mesoporous MCM ‐ 41. The surface modification method has been used in the preparation of serine‐grafted MCM ‐ 41 and led to the development of MCM‐41@Serine. The reaction of MCM‐41@Serine with Ce (NH₄)₂(NO₃)₆·2H₂O or ErCl₃·6H₂O in ethanol under reflux led to the organization of MCM‐41@Serine/Ce and MCM‐41@Serine/Er catalysts. The structures of these catalysts were determined using scanning electron microscopy, mapping, energy‐dispersive X‐ray spectroscopy, Fourier transform‐infrared, thermogravimetric analysis, X‐ray diffraction, inductively coupled plasma, and Brunauer–Emmett–Teller analysis. These MCM‐41@Serine/Ce and MCM‐41@Serine/Er catalysts show outstanding catalytic performance in sulfides oxidation and synthesis of 5‐substituted tetrazoles. These catalysts can be recycled for seven repeated reaction runs without showing a considerable decrease in catalytic performance.     

Growth of embedded ErAs nanorods on (4 1 1)A and (4 1 1)B GaAs by molecular beam epitaxy

The low solubility of Er in GaAs results in the formation of ErAs nanostructures when GaAs is grown with 5–6 at% Er/Ga ratio by molecular beam epitaxy on GaAs surfaces. For growth on the (4 1 1)A GaAs surface, cross-sectional scanning transmission electron microscopy images show the presence of ErAs nanorods embedded in a GaAs matrix extending along the [2 1 1] direction with a spacing of roughly 7 nm and a diameter of roughly 2 nm. Growth on the GaAs (4 1 1)B surface resulted in only nanoparticle formation. Variation of the polarized optical absorption with in-plane polarization angle is consistent with coupling to surface plasmon resonances of the semimetallic nanostructures.     

Progress of 1.5～1.6 μm Laser Crystals

Eye-safe 1.5～1.6 μm lasers have important applications in optical fiber communication, medicine, laser-range-finding, lidar, etc. Er^3＋ and Yb^3＋ co-doped crystal pumped by diode laser around 976 nm is an attractive method for obtaining 1.5～1.6 μm laser in compact device with high output beam quality. In this paper, the recent research and progress of several important Er^3＋ and Yb^3＋ co-doped laser crystals at 1.5～1.6 μm in authors’ lab are reported.     

A Novel Gain-Clamped Erbium Doped Fiber Amplifier for Wavelength Division Multiplexed Systems

Amplification of multiwavelength signals by an erbium-doped fiber amplifier (EDFA) is becoming critical, due to the proliferation of wavelength division multiplexed systems. However, when a standard EDFA is employed, the dissimilarities among the signals’ gain may prove unacceptable. Thus, a novel gain-clamped EDFA is proposed here to tackle the issue of gain tilt. The suitability of the configuration is then investigated through a numerical model, which is developed based on the standard EDFA and fiber laser models.     

Preparation and Characterization of Thermally Stable Silicon-Containing Fluoropolymer Matrix for Application to Erbium-Doped Waveguide Amplifiers

This study focuses on the fabrication of fluoropolymer films as erbium(Er³⁺) host material with a goal of achieving sufficient thermal stability, optical clarity in the optical communication region and a chemical resistance to withstand typical fabrication processing and operation conditions. To satisfy the demands mentioned above, acrylo-polyhedral oligomeric silsesquioxane as heat-resistance improver, 2,2,3,3,4,4,5,5-octafluoropentyl acrylate as fluorinated acrylic monomer, tetrahydrofurfuryl acrylate as solubility enhancer, 3-(trimethoxysilyl)propyl methacrylate as both a silane coupling agent and another heat-resistance improver and Darocur 4265 as photoinitiator were used. Various compositions were evaluated to obtain high quantity of Er³⁺ ions in the polymer matrix, high thermal stability and high transparency.     

镧系离子(Nd~(3+)、Ho~(3+)、Er~(3+))同乙酰水杨酸和二安替吡啉甲烷三元配合物的研究

对Ln~(3+)(Nd~(3+)、Ho~(3+)、Er~(3+))—乙酰水杨酸(Asal)—二安替吡啉甲烷(DAM)体系的乙醇—水溶液的光度法研究和对固态钕配合物的元素分析确定,三元配合物的组成比为Nd~(3+):Asal:DAM=1:3:1;考查了该配合物的红外、紫外吸收光谱,热稳定性和溶解性;计算了相应配合物的超灵敏跃迁的振子强度,讨论了振子强度的增值与配体数目的关系。