二元矩形金属光栅衍射增强电磁理论

采用耦合波原理计算了TM波经过二元纳米量级金属光栅衍射的电磁场，研究了金属光栅的占空比、光栅深度及TM波入射角对衍射后的光栅表面电磁场的增强的影响，针对金属金、银做了探讨和分析，得出重要的结论. 关键词： 耦合波原理 金属光栅 衍射     

几何光学近似下X光激光的三维传播与放大

 采用放大自发辐射(ASE)模型何光学近似,在考虑折射效应而不考虑饱和 ,用几效应和等离子体老化的情况下,编制了单靶三维光路计算程序,给出了出射X射线激光的强度角分布和空间分布。在线聚焦等离子体线宽方向尺寸有限和横向密度梯度为0的条件下,研究了X光激光传播放大特性,重新审视了计算横向发射角时所用的公式。     

反射镜双程放大对类氖锗软X射线激光的输出影响研究

纳秒量级激光驱动的类氖锗软X射线激光具有出光稳定和输出强度大等优点,在诸多领域拥有很好的应用价值. 研究了通过在光路中增加一块多层膜反射镜实现双程放大对出光特性的影响. 通过估算和实验,证实了增加反射镜双程放大确实能够提高类氖锗软X射线激光的输出强度,对于24mm的双程放大长度,总输出强度会增加约2.3倍. 但同时这种模式也带来了光束质量的下降,对应用研究并非完全有益. 关键词： 软X射线激光 反射镜双程放大 增益饱和     

Statistical properties of coherent photon-subtracted two-mode squeezed vacuum and its application in quantum teleportation

We introduce a kind of non-Gaussian entangled state, which can be obtained by operating a non-local coherent photon-subtraction operation on a two-mode squeezed vacuum. It is found that its normalization factor is only related to the Legendre polynomials, which is a compact expression. Its statistical properties are discussed by the negative region Wigner function with the analytical expression. As an application, the quantum teleportation for coherent states is considered by using the non-Gaussian state as an entangled channel. It is found that the teleportation fidelity can be enhanced by this non-Gaussian operation.     

Effect of pulsed bias on properties of ZrN/TiZrN films deposited by cathodic vacuum arc

ZrN/TiZrN multilayer are deposited by cathodic vacuum arc method with different substrate bias (from 0 to -800 V), using Ti and Zr plasma flows in residual N₂ atmosphere, combined with ion bombardment of sample surfaces. The effect of pulsed bias on structure and properties of films is investigated. Microstructure of the coating is analyzed by X-ray diffraction (XRD), and scanning electron microscopy (SEM). Meanwhile, the nanohardness, Young's modulus, and scratch tests are performed. The experimental results show that the films exhibit a nanoscale multilayer structure consisting of TiZrN and ZrN phases. Solid solutions are formed for component TiZrN films. The dominant preferred orientation of TiZrN films is (111) and (220). At pulsed bias of -200 V, the nanohardness and the adhesion strength of ZrN/TiZrN multilayer reach a maximum of 38 GPa, and 78 N, respectively. The ZrN/TiZrN multilayer demonstrates an enhanced nanohardness compared with binary TiN and ZrN films deposited under equivalent conditions.     

利用X射线激光进行激光等离子体射流的诊断

射流是激光惯性约束聚变(ICF)、天体物理学等领域中一种普遍存在的非线性现象.在实验室对射流现象进行模拟、诊断等方面的研究对于理解ICF、天体物理中的相关现象具有重要参考价值.采用纳秒激光辐照特殊形状的圆孔靶产生等离子体射流,利用波长为13.9nm的X射线激光作为光源对特定时刻的射流进行阴影成像,获得了清晰的射流阴影图像,与理论模拟结果定性一致. 关键词： 射流 X射线激光 等离子体诊断     

苏丹红Ⅰ、Ⅱ和Ⅲ的拉曼光谱研究

介绍了拉曼光谱法的基本原理和苏丹红的检测现状,利用拉曼光谱法对偶氮类染料苏丹红Ⅰ、Ⅱ和Ⅲ进行了检测,分别得到了能表征三种物质毒性的特征拉曼频移,最长扫描时间仅为15 s.实验表明,利用拉曼光谱法检测苏丹红Ⅰ、Ⅱ和Ⅲ,迅速方便,有望成为苏丹红类物质的有效检测方法.     

厚针孔钴源模糊图象的相干光处理

本文慨要介绍厚针孔(厚度340mm～1000mm)拍摄钴源目标的模糊图片的相干光增强处理方法。由于目标是一个体积源,且针孔直径大(φ1mm),γ射线对管壁又有穿透作用,故引起很大的模糊。根据点扩散函数计算的结果,我们制作了一种偏振滤波器和制作了一个只作用于零频域的如下式表示透过率的空间滤波器:     

A THEORETICAL SIMULATION FOR ACHIEVING HIGH SPATIAL COHERENCE OF LABORATORY X-RAY LASERS

An efficient method to achieve high spatial coherence of laboratory soft-X-ray laser is presented, in which a pinhole can be used in "four-target series coupling" experiment to obtain a fully coherent X-ray laser. The model of amplified spontaneous emission is used to describe the characteristics and spatial coherence properties of a soft-X-ray laser beam. The simulation results show that the method is feasible.     

纳米复合s2o2-8/sno2tio2催化α蒎烯异构反应

固体超强酸;s2o2-8/sno2tio2;纳米粒子;α-蒎烯;催化异构