波长路由在并行计算机光互连中的应用

提出了一种波长路由并行光互连技术，其路由直接在源端用目标地址选择波长来建立，各波长有独立传输路径并采用光通道复用，路由变换节点为全光结构，光信号在变换节点处无转发延迟。此技术可应用于并行计算机互连网络和分布式高性能计算机群的互连网络。     

利用SOA中的四波混频实现2.5Gb/s信号的波长变换实验

基于SOA中四波混频效应,对中心波长为15474nm,调制速度为25Gb/s的光信号进行波长变换实验,最大波长变换距离达98nm。     

利用非线性光纤环路镜将2.5Gbit／s归零码光脉冲波长变换20nm

利用光纤非线性环路镜成功地将２．５Ｇｂｉｔ／ｓ的归零码光脉冲变换了２０ｎｍ的距离。在最佳波长变换处对变换信号进行了１小时的误码测量,采用２２３－１伪随机码序列,误码为１．３×１０－１４。信号光和探测光脉冲宽度分别为２８ｐｓ和３７ｐｓ,中心波长分别为１５３３ｎｍ和１５５３ｎｍ。     

30km 2.5GHz光孤子波传输与压缩实验研究

通过实验研究了光孤子源的产生及光纤孤子的传输。采用增益开关分布反馈半导体激光器作为超短脉冲源，用１．４８μｍ激光泵浦的掺饵光纤放大器作为第一级功放，用Ｆ－Ｐ腔谱窗降啁啾技术产生变换限制脉冲，用另一只１．４８μｍ激光泵浦掺饵光纤放大器作为第二级功放，得到了重复频率为２．５ＧＨｚ的高功率变换限制光孤子脉冲；进行了３０ｋｍ光孤子传输实验，观察了光孤子的传输特性与高阶孤子的压缩特性。     

一种用于宽带温度稳定光隔离器的新型磁光材料

以Ｂｉ２Ｏ３／Ｂ２Ｏ３为主要助熔剂,用改进的高温助熔剂法生长出一种新型掺铋 事稀土铁石榴石（ＨｏＹｂＢｉ）３Ｆｅ５Ｏ１２单晶,研究了磁光性能,法拉第旋转温度和波长特性在１０－１１０℃,单昌的法拉第旋转温度系数Ｓ＝θＦ＾－１（ｄθＦ／ｄＴ）在λ＝１．５５μｍ时为４．６×１０＾－４Ｋ＾－１,比ＹＩＧ单晶的法拉第旋转温度系数小,在λ＝１．５５μｍ时,（ＨｏＹｂＢｉ）３Ｆｅ５Ｏ１２单晶的法拉第旋转波长系数     

LM—5光电型激光功率计的研制

ＬＭ－５光电型激光功率计使用优质的大面积硅光电二极管作探头，响应快、线性范围宽、灵敏度高，量程跨六个量亿，最低分辨力为０．００１ｕｗ（不确度小于２％）。该仪器的零点极稳定，任意变换六个量程不必重调，另外可通过波长选择开关选取不同的激光波长进行功率测量。     

LM－5光电型激光功率计的研制

ＬＭ－５光电型激光功率计使用优质的大面积硅光电二极管作探头，响应快、线性范围宽、灵敏度高，量程跨六个量级，最低分辨力为０．００１ｕＷ（不确度小于２％）。该仪器的零点极稳定，任意变换六个量程不必重调，另外可通过波长选择开关选取不同的激光波长进行功率测量。     

光电导型混晶Si1-xGex波导探测器

首次报导了光电导型混晶Ｓｉ－ｘＧｅｘ波导探测器。混晶Ｓｉ１－ｘＧｅｘ是在硅基ＳｉＯＮ／ＳｉＯ２／Ｓｉ上用快速加热超低压化学气相淀积生长并经６５０℃退火３０ｍｉｎ得到的。探测器宽１０μｍ,长２ｍｍ。探测器加２０Ｖ偏置电压是,探测灵敏在０．０２２－０．０１０Ａ／Ｗ之间。混晶Ｓｉ１－ｘＧｅｘ造成探测器的光谱响应曲线发生蓝移。当锗组分ｘ＝０．３５、０．４、０．５、和０．６时,探测器峰值波长分别对应为８７５     

2.5GHZ光孤子传输

报导了我国首次成功地实现了２．５ＧＨｚ光孤子传输。近变换极限的孤子脉冲源是带有Ｆ－Ｐ标准具的增益开关分布反馈激光二极管。孤子脉冲的功率通过分别由１４８０ｎｍ和９８０ｎｍ泵浦的两个掺饵光纤放大器放大，当入纤功率达到一阶孤子功率时，经过２１ｋｍ色散位移光纤传输后，孤子的输出脉宽保持不变。同时还观察到孤子脉冲压缩现象。     

两段式DFB半导体激光器波长调谐实验研究

采用国产普通折射率耦合型两段式ＤＦＢ半导体激光器进行了波长调谐实验研究，实验结果表明，通过分别调节激光器两段的工作电流，不仅可以使器件单模工作，而且还能进行波长调谐。波长调谐范围为６．２ｎｍ，连续波长调谐范围为０．９ｎｍ。     

国外光纤光纤带和带状光缆技术的最新发展

综合介绍了近年国外关于低衰耗的色散补偿光纤,非零色散位移光纤,用于恶劣环境的碳涂覆和氮化硅涂覆光纤的研究;光纤带制造技术包括光纤带的结构、涂层、性能、生产工艺,大芯数光纤带状光缆包括层绞式松管、中心松管式、骨架式、干缆芯带状光缆的设计制造技术的最新进展。     

小型宽光谱低分辨率光谱仪器光学设计

光栅作为小型光谱仪器分光系统的核心,采用不同种类的光栅制作分光仪器时其结构形式也不尽相同.文中为设计一个工作波段在340-800 nm,分辨率优于15nm,谱面长度28.71 mm的比色仪光学系统,通过对比常见光谱仪结构的优缺点,选择平场凹面光栅作为最终的结构形式,采用长波通滤光片实现对二级光谱重叠的消除,并对比色仪光...     

Photon,electron and ion beam induced physical and optical densification in chalcogenide films

Irradiation of 80° deposited Se-Ge films with band gap photons, 8 keV electrons and 50 keV He⁺ ions produces, primarily irreversible red shift of the absorption edge and major changes in doping and electrochemical adsorption processes. These changes have been attributed predominantly to the radiation-induced thickness and hence volume contraction resulting due to the physical collapse of the low density columnar microstructure of the obliquely deposited films. The farir and Urbach tail studies reveal an enhanced strength of electron-phonon coupling, in obliquely deposited films having a very porous columnar microstructure, compared to normally deposited films. It has been shown that this enhanced electron phonon coupling is conducive to large thickness contraction and associated changes. These changes have been used in reprographic and lithographic applications. A correlation has been established between the thickness contraction and lithographic parameters. The possibility of generating both positive and negative relief patterns on the same film by controlling the etching time has been demonstrated.     

Monodisperse colloidal spheres for (Y,Eu)2O3 red-emitting phosphors: establishment of processing window and size-dependent luminescence behavior

Abstract

The urea-based homogeneous precipitation method was introduced in the preparation of monodisperse colloidal spheres for (Y_0.95Eu_0.05)₂O₃ red-emitting phosphors, and the processing window was defined. Particle size and shape are significantly affected by the ion concentration and the urea/RE³⁺ molar ratio R (RE³⁺=Y³⁺+Eu³⁺). A low ion concentration is beneficial in forming monodisperse spheres and extending their formation domain. Increasing R results in a gradual change in the composition of spherical particles from the core-shell Eu(OH)CO₃@Y(OH)CO₃ structure to a homogeneous solid solution, thereby significantly lowering the calcination temperature at which precursors convert to oxides. Upon UV excitation into the charge-transfer band at 254 nm, the uniform phosphor spheres of (Y_0.95Eu_0.05)₂O₃ exhibit typical red emissions at 613 nm; the emission is stronger from larger particles mainly because of their smaller surface area. Both the luminescence intensity and quantum efficiency of the oxide phosphors increase with elevated calcination temperatures. The spherical shape and excellent dispersion of the precursor particles (～450 nm in diameter) have been well retained after calcination at 1000 ^○C for 4 h, and the resultant oxide phosphors exhibit external and internal quantum efficiencies of 50 and 82%, respectively.     

基于垂直扭转梳齿驱动结构的硅微机械扭转微镜的设计加工与表征

为了改善扭转微镜的机电耦合特性和光学特性,提出了一种新的基于SOI硅片的垂直扭转梳齿静电驱动结构．通过有限元与边界元方法,对不同厚度扭转梁的机电耦合特性进行了数值模拟,得到了相应的阈值电压和吸合电压,并提出了几种新的折叠梁结构,以进一步改善器件的机电耦合特性;通过力学分析,从理论上推导了垂直扭转梳齿静电驱动方式微镜的最大扭转角度、阈值电压、扭转刚度以及固有频率,获得了结构参数对器件机电耦合特性的影响机制;最后,利用比例散射理论讨论了表面粗糙度、入射光束波长和入射角度等参数对微镜表面光学反射性能的影响,并利用原子力显微镜测量了微镜的表面粗糙度,理论模拟与实验研究表明,基于SOI硅片和垂直扭转梳齿结构的硅微机械扭转微镜可显著降低器件的驱动电压,提高器件的机电耦合特性和微镜表面的光学反射特性．     

Creation of subwavelength light needle,equidistant multi-focus,and uniform light tunnel

A versatile method is presented for the creation of ultra-long subwavelength light needles with high-purity longitudinal polarization, uniform light tunnels of variable length and with narrow dark channel, or coaxially equidistant multi-focus with prescribed number and spacing. This is achieved by modulating the radially or azimuthally polarized vector beams using the same kind of amplitude apodization filter under a high numerical aperture aplanatic lens system. These peculiar focusing patterns may suit a variety of potential applications, such as optical trapping, particle acceleration, atom optical experiments, and near-field scanning optical microscopy.