光学系统热效应及分析软件研制

研究温度对光学系统的影响,讨论无热设计方法。采用温度热膨胀系统和光线追迹分析温度变化对光学系统结构参数的影响及成像质量的变化。研究表明,温度对光学系统的影响是明显的,无热设计是可行的。温度的热效率不可忽视,利用热效应分析光学设计软件可对光学系统的热效应进行有效分析。     

Characteristics of atmospheric aerosol optical depth variation over China in recent 30 years

This note retrieves the annual and monthly mean 0.75 μm aerosol optical depth (AOD) by using the daily direct solar radiation and sunshine duration data of 47 solar stations from 1961 to 1990. The characteristic of AOD variation over China in recent 30 years was analyzed. The results indicate that AOD increased obviously over China from 1961 to 1990. AOD increased most rapidly over the east part of Southwest China, the middle-and-lower reaches of the Yangtze River and the Tibetan Plateau. The increasing trend of AOD is also relatively distinct in North China, the Shandong Peninsula, east part of Qinghai Province, and coastal areas of Guangdong Province. However, in most parts of Northwest China and Northeast China, the increase of AOD is less significant, while in the west part of the Xinjiang Uygur Autonomous Region and some parts of Yunnan Province, AOD shows decreasing tendency. Generally, AOD reaches its maximum in spring and the minimum appears in summer. As to the linear trend, the maximum occurs in spring but the minimum in winter. Among the 47 stations selected in this note, the largest three stations of AOD are Chengdu, Chongqing and Nanchong, respectively, which all lie in the Sichuan Basin, and the smallest value of AOD occurs in Jinghong located in Yunnan Province.     

Synthesis of N-acetamide C60 nitride and its performance of optical limiting

N-acetamide C₆₀ nitride (N-acetamide-1,2-dihydro-1,2-aza-fullerene [60]) has been synthesized by the reaction of C₆₀ and azidoacetamide and initially characterized. Its mechanism was that the objective product is formed through intermediate triazoline. The computational study shows that N-nitride structure is thermodynamically more stable by using the semi-empirical AM1 SCF-MO method. The properties of optical limiting were tested by using double frequency Nd: YAG pulse laser system and showed that the optical limiting mechanism is reverse saturation absorption. At wavelength of 532 nm, compared with optical limiting for ns pulse, this new material has good optical limiting character for ps pulse. At wavelength of 707 nm, the capacity of optical limiting of the derivative is prior to C₆₀.     

Hydrothermal synthesis,characterization and nonlinear optical effect of orthorhombic phase Ca2B6O11·H2O

Hydrothermal treatment of calcium oxide and boric acid mixtures at temperatures between 234℃ and 300℃ has produced a colorless,transparent,orthorhombic compound Ca2B6O11.H2O.Of the seven known members of the series of hydrated dicalcium hexaborate containing boron-oxygen six-membered ring anionic group (B3O8)7-,only the title compound has been found to have the nonlinear optical effect.The second harmanic generation (SHG) effect of its crystal is larger than that of KH2PO4 (KDP).The reflection spectrum has shown that this compound has no absorption in the experimental wavelength range (800-240 nm).Its crystal structure is favorable for generating the nonlinear optical effect.     

高斯光束的光场分析

应用非涅耳衍射原理 ,推导出了高斯光束通过透镜后在光轴上的光场分布 ,并分析了几种特殊情况 .     

影响蓝色场致发光的几个因素

在分层优化方案的框架和以前分析的基础上 ,研究了影响蓝光产生和亮度的因素 ,比如 :谷间散射 ,激发中心的离化 ,分层优化的级联 ,以CdS做初电子源及硫空位的影响等 .     

高速光纤传输系统采用全通均衡器进行色散补偿的探讨

在分析了全通光均衡器的时延和色散特性的基础上,讨论了利用全通光均衡器进行色散补偿的原理,提出了评价全通光均衡器性能的参数和要求,介绍了色散补偿效果的评定方法,并给出了测试实例.     

三相光学电流互感器的双折射效应研究

分析了一种用于测量电力系统三相电流的光学电流互感器系统,用矩阵光学方法建立了既具有旋光效应又具有线性双折射效应的三相光学电流互感器系统的数学模型,对理论结果进行了仿真实验,指明了线性双折射效应对三相光学电流互感器系统在灵敏度,线性度、稳定性等方面的影响,从而说明,限制系统性能的主要因素是不能避免线性双折射的影响。     

InGaAs/InP量子阱和量子线的光学性质

采用有效质量理论６带模型,研究量子结构变化对Ｉｎ０．５３Ｇａ０．４７Ａｓ／ＩｎＰ量子阱和量子线光学性质的影响。计算结果表明量子线结构可以更低的注入电子浓度下,得到更高的光学增益,而且具有光学各向异性。说明量子线结构比量子阱结构提高量子激光器光学性能。     

光传送网(OTN)节点的路由模型

提出了光传送网节点路由模型的概念,讨论了节点路由模型应达到的要求和建立模型的意义;给出了普适的矩阵表示法和针对节点具体结构的图表示法;并讨论了两种方法各自的优缺点。最后针对实际的光传送网节点给出了几个例子,并通过这些例子说明了路由模型矩阵表示和图表示的求法。