非偏振光叠加传播及散射势获取的相关讨论

经典的Stokes理论认为非偏振光叠加仍为非偏振光。以高斯-谢尔模光束为示例,表明光场在自由传播的过程中情况并非总是如此。并以此为例,展示Stokes理论的可叠加性原理在描述光场传播过程中的本地行为和全局行为上是有区别的。作为应用示例,讨论了一个与大气和生物组织相关的散射势获取的问题。     

有源介观RLC电路的量子波函数及其双波描述

用表象变换的方法求得了介观RLC电路的量子波函数，并由此求得了电荷和电流的量子涨落，同时又用双波函数方法研究了有源介观电路的量子效应。通过两种方法的比较可知，电路的量子涨落与所处的状态密切相关，这一点由双波函数方法清楚可见。用双波函数求得的电荷和电流的系综平均值正是用波函数求得的电荷和电流的期望值。     

多路高压放大器输出直流电压监测与显示系统设计

在自适应光学系统中,自适应控制器AD输出控制信号需要通过高压放大器放大成高压电驱动压电陶瓷变形镜,从而实现波前实时校正.在实际系统中,往往需要对高压放大器输出电压进行实时监测.本系统采用小体积单片机C8051F310作为控制器,采用专用电表芯片CS5460A作为核心测量芯片,实现了单板对20路0～500 V直流电压的实时监测与显示,线性度优于0.2％.     

微腔与腔量子电动力学研究进展

光学微腔中原子之自发辐射与自由空间中原子的自发辐射有着重要的不同。微腔能够控制腔内原子的自发辐射，使自发辐射得到抑制或增强，并有可能使自发辐射成为一个可逆过程。由此发展起来的腔量子电动力学能够阐述腔场与原子的相互作用。本文简要介绍了这一研究领域的背景和进展，同时介绍了微腔的重要应用一无阈值激光器。     

非对称量子阱中线性和三阶非线性光吸收系数的研究

主要研究了一个特殊非对称量子阱中的线性和三阶非线性光吸收系数。首先利用量子力学中的密度矩阵算符理论和迭代方法导出了线性和三阶非线性光吸收系数的表达式，然后以典型的非对称量子阱GaAs／AIGaAs材料为例作了数值计算。数值结果表明，入射光强以及系统的非对称性对总的光吸收系数有比较大的影响，从而为实验研究提供理论依据。     

一维光子晶体的全向反射特性

利用传输矩阵方法研究了一维光子晶体的全向反射特性.研究表明,光子晶体的结构参数对全向反射带的产生影响很大.要提高光子晶体的全向反射带带宽,必须增大两种介质的折射率及它们的高低折射率比值,同时使低高折射率层的光学厚度比接近0.85.研究结果对全介质反射器的设计具有指导意义.     

利用激光脉冲飞行时间测量货车车厢体积

介绍了利用激光脉冲飞行时间测距技术测量货车车厢体积的技术方案。通过该方法,可以准确地把2~6轴货车的车厢体积从货车体积中分离出来并计算得到。通过所采用的三阶高度矩算法此算法来源于数字图像处理边缘检测中的三阶灰度矩,对于各种车轴的货车,都可以精确地去除车头和车底货架并计算出车厢体积,而且针对台阶状的6轴车,台阶点的位置和车厢体积也能准确地获得。此外,所介绍的货车截面数据翻摺拼合技术激光扫描测距仪的数量可以减少到2台。该测试方式已应用到货车厢体积测量的实际工程中,通过大量实际货车数据验证,它能很好地计算出货车厢的体积。     

Relationship between microscopic and macroscopic structures of organic thin films for SHG

The experiments described in this paper were undertaken in order to obtain information about the relationship between the structure and non-linear optical properties (second-harmonic generation) of organic thin films. For this purpose, two closely related dyes, diones and tetrones, were compared, both of which are shown to have large hyperpolarisabilities. Their microscopic properties are investigated by conformational analysis and electron diffraction. It could be shown that detailed knowledge about the structure and the adjacent neighbour packing can be obtained from conformational analysis and electron diffraction in order to understand the non-linear optical properties of the two dyes.     

Enabling Coarse X-ray Fluorescence Imaging Scans with Enlarged Synchrotron Beam by Means of Mosaic Crystal Defocusing Optics

Trace elements, functionalized nanoparticles and labeled entities can be localized with sub-mm spatial resolution by X-ray fluorescence imaging (XFI). Here, small animals are raster scanned with a pencil-like synchrotron beam of high energy and low divergence and the X-ray fluorescence is recorded with an energy-dispersive detector. The ability to first perform coarse scans to identify regions of interest, followed by a close-up with a sub-mm X-ray beam is desirable, because overall measurement time and X-ray dose absorbed by the (biological) specimen can thus be minimized. However, the size of X-ray beams at synchrotron beamlines is usually strongly dependent on the actual beamline setup and can only be adapted within specific pre-defined limits. Especially, large synchrotron beams are non-trivial to generate. Here, we present the concept of graphite-based, convex reflection optics for the one-dimensional enlargement of a 1 mm wide synchrotron beam by a factor of 5 to 10 within a 1 m distance. Four different optics are tested and characterized and their reflection properties compared to ray tracing simulations. The general shape and size of the measured reflection profiles agree with expectations. Enhancements with respect to homogeneity and efficiency can be expected with improved optics manufacturing. A mouse phantom is used for a proof-of-principle XFI experiment demonstrating the applicability of coarse and fine scans with the suggested optics design.     

最佳端焦耦合法测量交叉光波导损耗特性

本文利用最佳端焦耦合法对交叉光波导的损耗特性进行了测量和研究，绘制了波导损耗随交叉次数和交叉角的变化曲线。测量结果与预期特性相吻合。