Cu离子交换波导的制备和折射率分布的表征

用Cu离子交换技术制备了玻璃平面光波导,利用IWKB法与离子浓度计算折射率的方法结合,得到了Cu 和Cu2 相对应的折射率分布.当离子交换深度较深时,折射率变化主要是由Cu 引起,且折射率变化较小;而当深度较浅时,折射率变化则是由Cu 和Cu2 共同作用的结果,而Cu2 的对折射率变化的贡献集中在玻璃表面.通过离子浓度计算得出5 min交换时间的折射率分布呈现准梯度折射率分布形状,而随着离子交换时间的增加所制备的平面波导通过棱镜耦合无法测到波导模式,这可能是由于波导表面折射率下降所致,其机理可能是由于Cu 的外扩散和大离子直径的Cu2 在玻璃表面附近产生的应力在高温下退火被释放的共同结果.     

离子交换玻璃光波导工艺与集成光学器件研究

针对目前国内集成光学技术的现状,对离子交换玻璃基集成光学技术进行了研究,目标是在建立起一个离子交换玻璃基集成光学制作平台,并在此基础上研制出低成本的光通信用光功分器.通过对玻璃基离子交换工艺进行的研究,包括电场辅助离子交换、电场辅助退火、K+离子掩膜工艺等,成功制备了具有低传输损耗和优良偏振相关损耗的掩埋式光波导;通过对基于Y分支器的光功分器结构的优化,成功研制了1×4、1×8、1×16、1×32的功分器,器件的主要性能指标已经"达到同类产品的国际水平".此外,还进行了新型光学器件制作方面的研究.     

电场辅助离子交换制备玻璃光波导

使用电场辅助离子交换和热离子交换技术在玻璃基片上制作了平板波导。实验结果表明,这两种方法制作的波导的有效折射率分布不同,电场辅助离子交换技术制作的波导有效折射率呈近似阶跃型分布,而热离子交换制作的波导有效折射率分布为渐变型。经数值计算发现,近似阶跃型折射率分布的波导对光场限制得更好,更适用于制作有源光器件和集成光器件。     

在玻璃衬底上制作K~+离子交换掩埋波导的新工艺

本文报道用不同离子两步交换技术,在玻璃衬底上制作K~+离子交换掩埋波导的新工艺,它不要求施加外电场。用X射线能谱(XES)分析技术测试了K~+离子的浓度分布,证明所制出的样品是掩埋波导。     

掩埋型掺铒玻璃波导光放大器的特性分析

通过求解双向泵浦传输－速率方程的方法对掩埋型掺铒玻璃波导光放大器（EDWA）的特性进行了理论分析，包括特定折射率光波导中的信号光和泵浦光模场分布，以及EDWA的增益特性。     

高斯折射率分布Cu+-Na+离子交换玻璃波导的制备

利用Cu+ Na+ 离子交换技术制备了玻璃平面光波导 ,在 6 32 8nm波长下 ,用棱镜耦合技术测量出所制备波导的有效折射率 ,利用反WKB方法确定了平面光波导的折射率分布 ,并对折射率分布进行了函数拟合 ,近似符合高斯分布。求出了所制备玻璃平面光波导在 5 80℃的扩散系数为De ≈ 2 2 2 3× 10 -15m2 /s。     

Cu离子交换过程对制备玻璃平面光波导特性的影响

用Cu离子交换技术,制备了soda-lime玻璃平面光波导。通过棱镜耦合技术测量了波导的有效折射率,用反WKB方法拟合得到了平面波导的折射率分布。研究发现,离子交换时间和温度2个可控的制备参数对制备的玻璃平面波导特性有较大影响,随着离子交换时间和温度的增加,波导的模式数和波导深度并非随之单调增加,波导模式数随着离子交换时间的增加先增加而后减小,而适当的离子交换时间可以使制备的波导具有最大的模式数和波导深度,且在该条件下增加离子交换温度可以提高Cu离子交换波导的蓝-绿发光强度,宽带发光中心波长在520 nm附近,发光强度取决于样品中Cu+的浓度以及Cu2+的影响。     

玻璃基片上双层多模光波导的制备

在光学玻璃基片上制作了双层掩埋式多模光波导芯片,这种芯片中的上、下两层光波导均通过熔盐离子交换和电场辅助离子迁移形成。对光波导的横截面以及输出光斑进行了观察,并进行了损耗和串扰测试。研究结果表明:双层多模光波导芯片中上、下两层光波导芯部横截面尺寸分别为29 m19 m和31 m20 m;两层波导的输出光斑尺寸相互匹配;两层波导传输损耗分别为1.000.32 dB/cm和0.780.35 dB/cm;两层光波导之间的串扰在17.7dB左右。这种玻璃基片上的双层多模光波导可以使板级光互连的互连密度增大一倍,提高EOCB的性能。     

稀释AgNO3交换玻璃光波导的特性

本文对稀释ＡｇＮＯ３交换玻璃光波导进行了实验研究，实验结果表明：波导的折射率ｎ０随溶化物稀度的增加而降低，因此，Ａｇ＾＋离子交换玻璃光波导的折射率可通过选用不同的溶化物稀度而精确的控制。     

掺Er3+玻璃光波导放大器的新进展

介绍了掺稀土元素的玻璃集成光波导放大器的原理、结构和制作方法特点,同时介绍了这一领域的新进展和发展趋势。     

K -Na 离子交换1×32光功分器的设计

设计了玻璃基K+-Na+离子交换1×32级联Y分叉光功分器.由于采用了一种新型的器件结构形式,光功分器的长度得以缩短,当输出波导间距为127 μm、波导最小曲率半径为30 mm时,器件总长只有20 mm.为了提高器件的功分均匀性,对波导的泄漏模进行了控制,使一阶泄漏模的损耗速度达到32 dB/cm.为了提高波导与光纤的耦合效率,器件输入输出端进行了光斑尺寸变换,使光纤-波导的耦合损耗降低到0.26 dB.     

XPS对离子交换法光色玻璃中银的状态研究

本文介绍利用ｘ射线光电子能谱分析仪（ＸＰＳ），对玻璃表面银的存在状态进行研究，实验结果表明银以Ａｇ＾０、Ａｇ＾＋、Ａｇ＾＋＋三种状态存在，而Ａｇ＾＋的存在有利于玻璃光色性的提高。文中并提出了在工艺过程中应采用惰性或弱氧化性气氛。     

玻璃基集成光学器件研究进展

综述了玻璃基集成光学器件离子交换工艺的原理及技术现状,介绍了近年来我们在玻璃基光波导制作工艺方面的研究工作,并提出了研究工作面临的问题.     

Planar optical waveguides prepared in GIL49 and BK7 glass substrates by K+-Na+ ion exchange with the electric field assistance

This report focuses on research into waveguides prepared by K⁺-Na⁺ ion exchange with the help of an electric field, and the subsequent comparison with waveguides prepared by pure thermal ion exchange. The goals of this work were to determine the characteristics of and to address the technological problems associated with waveguides prepared in two types of highly pure optical glass: special soda-lime silica GIL49 glass produced from pure raw materials and commercially prepared borosilicate BK7 glass. An appropriate chemical mixture, KNO₃:Ca(NO₃)₂ in the molar ratio of 41:59, was used as the source of potassium ions. Experiments were conducted at temperatures between 250 and 410°C, and electric field values between 0 and 150 V/mm. The number of modes, depth, profile, and the change in refractive index (Δn) were measured for samples from each type of glass under various technological conditions. All of these parameters can be controlled accurately and repeatedly by the electric field. These experiments have also shown that a particular advantage of these types of pure glass is the low waveguide optical losses (0.1 to 0.2 dB/cm) attainable.     

玻璃基多模波导光功分器的研制

利用Ag+-Na+电场辅助玻璃基离子交换技术制作了低损耗的掩埋多模波导,并在此基础上研制了多模波导光功分器.测试分析了多模波导和光功分器的损耗和偏心率特性.所研制的多模直波导传输损耗小于0.1dB/cm,所制作的1×2的多模波导光功分器附加损耗小于1.3 dB.     

Ce3+离子对掺Er3+碲酸盐玻璃光谱性质的影响

研究了Ce3 + 对掺Er碲酸盐玻璃荧光光谱性质的影响 ,比较了不同的Ce3 + 掺杂浓度下Er3 + 离子荧光发光强度的变化 ,分析了Ce3 + 离子对Er3 + 离子作用的原理 ,应用经典方程计算了Er3 + 离子 4I1 1 / 2 能级的荧光寿命及其变化     

Highly Reversible Anion Redox of Manganese-Based Cathode Material Realized by Electrochemical Ion Exchange for Lithium-Ion Batteries

Anion energy storage provides the possibility to achieve higher specific capacity in lithium-ion battery cathode materials, but the problems of capacity attenuation, voltage degradation, and inconsistent redox behavior are still inevitable. In this paper, a novel O2-type manganese-based layered cathode material Li_x[Li_0.2Mn_0.8]O₂ with a ribbon superlattice structure is prepared by electrochemical ion exchange, which realizes the highly reversible redox of anions and excellent cycle performance. Through low-voltage pre-cycling treatment, the specific capacity of the material can reach 230 mAh g⁻¹ without obvious voltage attenuation. During the electrochemical ion exchange, the precursor with P2 structure transforms into Li_x[Li_0.2Mn_0.8]O₂ with O2 structure through the slippage and shrink of adjacent slabs, and the special superlattice structure in Mn slab is still retained. Simultaneously, a certain degree of lattice mismatch and reversible distortion of the MnO₆ octahedron occur. In addition, the anion redox catalyzes the formation of the solid electrolyte interface, stabilizing the electrode/electrolyte interface and inhibiting the dissolution of Mn. The mechanism of electrochemical ion exchange is systematically studied by comprehensive structural and electrochemical characterization, opening an attractive path for the realization of highly reversible anion redox.     

High Performance Flexible Lithium-Ion Battery Electrodes: Ion Exchange Assisted Fabrication of Carbon Coated Nickel Oxide Nanosheet Arrays on Carbon Cloth

Transition metal oxides (TMOs)-based anode materials of high theoretical capacities have been intensively studied for lithium-ion storage. However, their poor high-rate capability and cycling stability remain to be effectively resolved. Herein, a novel ion exchange (IE)-assisted indirect carbon coating strategy is proposed to realize high performance freestanding TMO-based anodes for flexible lithium-ion batteries (FLIBs). This approach effectively avoids the possible side reaction of oxide reduction, enhances degrees of graphitization of the carbon coating, and preserves advantageous nanostructure of the starting template, leading to enhanced electrical conductivities, alleviated volume variation induced structural instability, fast lithium-ion diffusion pathways and enhanced electron transfer kinetics. As a proof of concept, IE-prepared carbon coated NiO nanosheet arrays with excellent structural and electrochemical stability are developed as freestanding anodes for LIBs and FLIBs, which exhibit outstanding electrochemical performances superior to most state-of-the-art NiO-based anodes reported in recent years. The product anode delivers a high areal capacity (3.08 mAh cm⁻² at 0.25 mA cm⁻²), outstanding high-rate capability (1.78 mAh cm⁻² at 8 mA cm⁻²) and excellent cycling stability (over 300 cycles). Further pouch cell tests confirm the excellent flexibility of the freestanding electrode against mechanical deformation with well-maintained electrochemical performance under folding.     

高温溶液法生长PZN-9PT弛豫铁电晶体

采用高温溶液法制备了PZN-9PT晶体,研究了晶体相结构、生长形态,表征了其介电、压电和电滞回线等部分电学性能。结果表明,采用高温溶液法可制备出纯钙钛矿结构的PZN-9PT单晶,晶体呈淡黄色多面体形态,晶粒表面的台阶均为直形生长台阶;其三方-四方相转变温度为89℃,居里温度为175℃;[221]切型PZN-9PT单晶的压电常数为230 pC/N,矫顽场为8.8 kV/cm。