冰洲石-玻璃组合平行分束偏光镜的设计研究

为了既节省稀有昂贵的冰洲石晶体材料，又实现偏振光的大剪切差输出，采用冰洲石晶体与光学玻璃组合的方法，设计了一种新型平行分束偏光镜。该棱镜的前后半块分别为ZBaF₃玻璃和冰洲石晶体，由大折射率液态胶合剂溴代萘胶合而成。实验测试表明：该棱镜透射的2束平行光的消光比，o光可达10^－5；尽管受到光学玻璃的影响，e光的消光比仍优于10^－3；透射比均与纯冰洲石晶体材料的棱镜基本相当。理论分析表明：该棱镜自身结构带来的性能影响在一定情况下完全可以忽略，因此具有较好的应用前景。     

立方棱镜二向色分光膜消倍频反射峰的设计

立方棱镜二向色分光镜是实现多光谱共光路的重要器件.立方棱镜二向色分光镜因偏振效应而在高级次倍频处出现高反射峰,严重影响了短波区的透过率.利用虚设层概念,设计出了400 nm～900 nm波段高透过、1 064 nm激光波段高反射的立方棱镜二向色分光镜.给出了消除倍频反射峰的有效方法,并成功制作出光学性能优良的样品.采用这种设计方法获得的膜系结构简单,膜层数量少,材料选择广泛,对工艺要求简单,便于工艺实现,可重复性好.     

三元结构双反射平行分束偏光镜设计

为了节省冰洲石晶体材料,并实现两束偏振光的平行输出,采用冰洲石与光学玻璃组合的方法,给出一种双反射形式平行分束偏光镜的新设计。该棱镜为ZBaF3玻璃中间加冰洲石晶体薄片的三元结构,采用溴代萘胶合;选择合适的结构角,令电矢量振动方向相互垂直的两束偏振光分别在前胶合面、后端面发生全反射,并垂直上端面平行出射。实验测试表明,棱镜的透射比高于80%,消光比优于10-3。该设计在节省冰洲石晶体前提下,保持了良好的性能。     

Wollaston式平行分束与对称分束偏光棱镜设计

从Wollaston棱镜结构出发,寻找到两种设计方案,即把出射面为平面改为两个平面,若两平面向里凹,能得到大分束角对称分布的o、e光;若两平面向外凸,能得到剪切差大的平行出射的o、e光。大大拓宽了Wollaston式棱镜的使用范围。     

Rochon起偏分束棱镜的结构设计

Ｒｏｃｈｏｎ棱镜是一种重要的冰洲石起偏分束器。本文通过分析棱镜结构设计中涉及的切割角、偏向角、半视场角和所用胶合剂的折射率等因素，提出了一种设计方法，并形成计算机程序，不仅可以优化结构参数；还可以对棱镜的若干性能作出预测。     

滤波-荧光谱仪的优化设计

滤波-荧光法是一种重要的X射线诊断技术,对于温度为1.4×107—1.6×107K的黑体辐射,设计了包含V-Ti,Co-Fe,Cu-Ni和Zn-Cu四个组合的滤波-荧光谱仪,信号测量通道增加了相应本底测量辅助通道.计算结果表明,采用与信号通道相同设置的辅助通道测量效果不佳,需要对辅助通道后滤片进行重新设置以确保对本底的正确测量.     

Optimized IR synchrotron beamline design

Synchrotron infrared beamlines are powerful tools on which to perform spectroscopy on microscopic length scales but require working with large bending‐magnet source apertures in order to provide intense photon beams to the experiments. Many infrared beamlines use a single toroidal‐shaped mirror to focus the source emission which generates, for large apertures, beams with significant geometrical aberrations resulting from the shape of the source and the beamline optics. In this paper, an optical layout optimized for synchrotron infrared beamlines, that removes almost totally the geometrical aberrations of the source, is presented and analyzed. This layout is already operational on the IR beamline of the Brazilian synchrotron. An infrared beamline design based on a SOLEIL bending‐magnet source is given as an example, which could be useful for future IR beamline improvements at this facility.     

Optimized design of multiport optical circulator

This research proposes a practical multiport optical circulator design by using polarizing beam splitter cubes as spatial walk-off polarizers. The use of Porro prisms for directing light requires fewer components and improves space-efficiency. Therefore, a high performance device can be produced at a reduced cost. A six-port optical circulator prototype was fabricated to show the feasibility of the proposed design. The insertion losses range between 0.52 and 1.05 dB, the isolations range between 26.20 and 45.13 dB, and the return losses are 27.72 dB. The benefits of this design's simple and symmetrical structure include cost-efficiency, simple fabrication processes, polarization-independence, the resolve of polarization-mode dispersion issues, and high performance. Additionally, the number of ports can be increased easily.     

三元结构剪切差对入射点连续可调的平行分束偏光镜设计

为了节省稀有的冰洲石晶体材料,并实现剪切差对入射点的连续可调,采用冰洲石与光学玻璃组合的方法,设计了一种新型平行分束偏光镜。该棱镜是在ZBaF3玻璃中间夹冰洲石晶体薄片的三元结构,并用溴代萘胶合;选择合适的结构角,令电矢量振动方向相互垂直的两束偏振光在不同端面平行出射。实验测试表明,棱镜的e光透射比高于70%,o光透射比高于85%,消光比优于10-3。该设计在大大节省冰洲石晶体的前提下,不仅保持了良好的性能,而且还实现了剪切差对入射点的连续可调,给使用带来了巨大的便利,具有良好的应用前景。     

Optics design of a top-cut prism interferometer for holographic photonic quasicrystals

Optical interference holography has been proved to be a useful technique in fabricating periodic photonic crystals in which electromagnetic waves are forbidden in certain frequency band-gaps. Compared to periodic crystals, quasicrystals have higher point group symmetry and are more favorable in achieving complete band-gaps. In this report, a top-cut prism interferometer is designed and optimized for photonic quasicrystals. By changing the prism parameters and characteristics of different beams, different quasicrystalline structures can be obtained. At the same time, the diffraction patterns of the designed structures are also provided and reveal the ten-fold symmetry of the structures more clearly. Furthermore, the effect of the intensity threshold on the quasicrystalline structures is also investigated. This will provide guidance for the large-area and fast production of ten-fold quasicrystalline structures with high quality.     

混合型波荡器的3维优化

以波荡器辐射波和共振电子能及混合型波荡器的解析计算为基础,通过3维磁场的有限元计算,在欧洲光源横向优化基础上,给出了同步辐射和自由电子激光用混合型波荡器纵向优化参数,进而给出了用于DUV FEL混合型波荡器的设计计算参数。加侧位和顶部永磁块后,峰值磁场分别提高到0.722T和0.773T,辅助以1μm量级分辨率的磁间隙调节机械系统,磁场分辨率好于10-4T量级。     

混合型波荡器的3维优化

 以波荡器辐射波和共振电子能及混合型波荡器的解析计算为基础，通过3维磁场的有限元计算，在欧洲光源横向优化基础上，给出了同步辐射和自由电子激光用混合型波荡器纵向优化参数，进而给出了用于DUV FEL混合型波荡器的设计计算参数。加侧位和顶部永磁块后，峰值磁场分别提高到0.722T和0.773T，辅助以1μm量级分辨率的磁间隙调节机械系统，磁场分辨率好于10^-4T量级。     

光纤激光陀螺系统的优化设计

分析研究了光纤激光陀螺系统的工作原理和基本构成,根据系统中各器件的性能指标对光纤激光陀螺的基本结构、性能参数进行了计算机模拟优化设计。采用双向激射双向输出结构保证光路的互易性。利用光纤环形器、掺铒光纤和光纤Bragg光栅实现滤模、选模和压缩线宽功能。针对其输出信号特点,提出利用偏振分束的方式判断陀螺工作转动方向,并最终计算陀螺转动角速度的信号处理方案。     

Y型光波导分束比和插入损耗测量技术研究

Y波导在集成光学系统中得到了广泛的应用,并拥有很大的潜力,近年来备受关注。因此了解它的各项指标至关重要。在Y波导的诸多指标中,分束比和插入损耗是2个重要指标。着重介绍了2个指标的测量装置及测量方法。对于分束比,分别采用波长为1300nm和1550nm的激光光源测量Y波导两尾纤的输出光功率。根据公式计算出分束比后,分析影响测量结果的主要因素,进行测量不确定度评定。对于插入损耗,主要是按照测量原理搭建测量装置,从理论上分析影响插入损耗测量的因素。通过对Y波导2个指标的测量,有助于更好地了解Y波导的性能。     

ICT并行重建算法设计与实现

分析了三维ICT近似重建FDK快速算法以及算法串行执行与并行执行的复杂度,利用MPI并行编程环境,对原有ICT重建流程进行并行化,在PC集群上实现了并行ICT重建,进行了系统集成。给出了系统应用实现的解决方案与软件集成流程图。实验结果证明串行重建和并行重建结果是一致的,并行重建可以得到比较理想地重建时间结果和比较理想的加速比与效率。     

基于渥拉斯顿棱镜的单路实时偏振成像系统设计

针对非实时成像中动态场景偏振探测产生的虚假偏振信息问题,充分利用渥拉斯顿棱镜的分光特性,设计了一种新型实时偏振成像系统.采用像方远心望远透镜系统、准直透镜系统并设计匹配的成像镜系统,在单探测器阵列上同时获取偏振态相互垂直的两幅偏振图像.通过全系统联动设计与优化,系统的调制传递函数在截止频率处不小于0.55,全系统弥散斑均方根半径小于5.3μm,即小于探测器像元尺寸,满足成像设计要求.仿真结果证明该成像系统可有效解决传统分振幅偏振成像系统的实时性差的不足,分孔径偏振成像系统的能量利用率和分辨率低的问题以及偏振焦平面方法中光路串扰的缺陷,应用前景广阔.     

强吸收-强反射型听音室声场的有限元优化

为获得听音室预期的平直混响时间和合适的房间形状,提出了一种结合强吸收-强反射概念和有限元优化技术的设计方法,并进行了实验验证。对按照优化设计结果所搭建的听音室的房间频率响应、混响时间进行了实际测量,实测数据显示了与解析计算、数值模拟结果有着较好的吻合。在整个设计频段内混响时间特性曲线平直,优化后房间低频段两个倍频程内频率响应的标准偏差可降低约6dB。1/3倍频程中心频率上实测混响时间的方均根值和设计值的偏差在63至4 kHz的6个倍频程内仅为0.02 s。     

变焦凸轮曲线的优化设计

本文以２．５￣（×）小变焦照相物镜为例。推导了变焦凸轮曲线斜率之间的关系式，以及如何选取变焦凸曲线压力角的值域。并介绍了具体的设计步骤、方法。     

Optical system design of the Dyson imaging spectrometer based on the Fery prism

Imaging spectrometer has obtained wide development since rich feature information can be obtained by it; now, we focus on its high spectral resolution and miniaturization. In this paper, we design the Dyson imaging spectrometer system based on Fery prism. The average spectral resolution is 4.3 nm and the structure of the total length is 229 mm. It is a small, high-spectrometer imaging system. The front and rear surface of the traditional prism are plane, but the surfaces of the Fery prism are spherical, which can provide some optical power to realize imaging function and produce the dispersion effect. The Fery prism does not need to be placed in the parallel optical path, which simplifies the collimator lens and the imaging lens and are necessary in the prism spectrometer, making it possible to obtain a compact spectrometer. Full-spectrum transmittance of the prism is up to 94 %. Compared to the convex grating, the energy efficiency is greatly improved, and the free spectral range is wider, and its dispersion will not bring higher-order spectral aliasing problem. The small high spectrometer only includes two components. Its spectral range is from 400 to 1000 nm, covering the near-ultraviolet to near-infrared. The various aberrations of the typical spectrum are corrected. The spectrometer is excellent in performance.     

基于全反射原理的圆台压平棱镜设计与应用实验

利用全反射原理,设计了特殊的圆台压平棱镜探头,可线性测量角膜的压平面积.本文介绍了圆台压平棱镜的设计方法,给出了测量压平面积的实验装置和测量结果.