共查询到20条相似文献,搜索用时 78 毫秒
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本文叙述了全息光栅的制造原理、工艺要求和制造技术。介绍了平场全息光栅、图象全息光栅、超环面全息光栅、激光全患光栅和闪耀全息光栅的新进展。最后,作者提出进一步发展全息光栅的若干建议。 相似文献
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对称面形光栅TE模的衍射特性 总被引:3,自引:1,他引:2
本文采用耦合波方法计算了对称面形光栅的衍射效率,分析了光栅截面面形为正弦、三角形、矩形、梯形光栅衍射效率与光栅周期、沟槽深度的关系,计算了光栅的峰值衍射效率。理论计算表明:合理地选择光栅周期、沟槽深度,对称面形光栅都可以达到很高衍射效率,接近100%;光栅的峰值衍射效率基本出现在Bragg衍射且光栅的周期等于衍射波长时。 相似文献
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本文首次用矩阵光学理论结合光栅衍射相干条件,推出双光栅成象的几何光学表示式,用象位移叠加的观点解释了双光栅成象系统Talbot自成象以及双光栅成象现象,首次将双光栅成象现象分为1)基于光栅和透镜组成系统对第一块光栅进行成象的双光栅成象和2)基于编码光源成象原理的双光栅成象,指出这是两种截然不同的双光栅成象,扩展了双光栅成象的物理意义。最后给出了实验结果。 相似文献
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刻划光栅存在刻线弯曲误差,将直接影响光栅的衍射波前质量。通过构建光栅刻线弯曲误差与衍射波前的映射关系,搭建了光栅刻线弯曲误差的实时测量光路,论述了光栅刻划机主动控制技术原理,将光栅刻划机主动控制技术用于光栅刻线弯曲误差的在线补偿。通过对比光栅刻划实验验证该方法的可行性。上述方法能够准确提取并有效补偿光栅刻线弯曲误差,将光栅衍射波前由0.074 λ提高到0.038 λ,提高了48.6%,同时有效地解决了光栅表面弯曲问题。其研究结果可用于提高机械刻划光栅质量,具有重要的理论及应用价值。 相似文献
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从全息光栅法出发 ,详细阐述了应用偶氮苯聚合物光致表面调制效应制备光栅的新工艺 ,说明使用偶氮苯聚合物薄膜制备光栅方法的特点 ,介绍了采用新工艺制备的光栅的独特性质———光栅可热擦除或光学擦除 ,同时提出应用新材料光栅制造方法所面临的问题。采用新工艺实验制备了薄膜光栅 相似文献
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针对现有液晶光栅器件存在的光栅常数不能变化、电极尖端放电、边缘效应等缺点,设计了一种可转换光栅常数的液晶光栅。通过控制不同导电区的通断电,使液晶光栅不同区域产生透光与不透光,实现光栅常数的转换;液晶光栅梳状电极端部的圆弧状设计,避免了尖端放电现象,减小了边缘效应的影响。以He-Ne激光为光源,用WGD-8A型组合式多功能光栅光谱仪对所设计的液晶光栅器件进行了测量,结果表明:通过控制导电区的变化实现了光栅常数的转变,在2~3.4 V电压驱动下,具有3种不同光栅常数的液晶光栅的1级衍射光强逐渐增强,且其衍射光强的差值不断增大,达到了预期设计目的。设计的液晶光栅在视差栅栏、光栅尺等方面有好的应用前景。 相似文献
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The polarization selectivity is described based on the two-layer grating sandwiched between two fused-silica substrates. The polarization-selective grating can diffract TE polarization with high efficiency and split TM polarization with good uniformity. With the novel structure, the grating can have high efficiency of sandwiched grating and wideband property of two-layer grating. The modal method is applied to analyze the grating, which corresponds well with the results of rigorous coupled-wave analysis. The physical analysis can give the good guideline to optimize the polarization-selective sandwiched two-layer grating effectively. Such a polarization-selective grating can also have merits of high efficiency for TE polarization and wide angular bandwidth for TM polarization based on the two-layer grating sandwiched between two fused-silica substrate. It is easy to clean and protect the grating surface compared with the surface-relief grating. 相似文献
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Quantitative coherence analysis of dual phase grating x-ray interferometry with source grating 下载免费PDF全文
Dual phase grating x-ray interferometry is compatible with common imaging detectors,and abandons the use of an absorption analyzer grating to reduce the radiation dose.When using x-ray tubes,an absorbing source grating must be introduced into the dual phase grating interferometer.In order to attain a high fringe visibility,in this work we conduct a quantitative coherence analysis of dual phase grating interferometry to find how the source grating affects the fringe visibility.Theoretical analysis shows that with the generalized Lau condition satisfied,the fringe visibility is influenced by the duty cycle of the source grating and the transmission through the grating bar.And the influence of the source grating profile on the fringe visibility is independent of the phase grating type.Numerical results illustrate that the maximum achievable fringe visibility decreases significantly with increasing transmission in the grating bar.Under a given transmission,one can always find an optimal duty cycle to maximize the fringe visibility.These results can be used as general guidelines for designing and optimizing dual phase grating x-ray interferometers for potential applications. 相似文献
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基于椭球面光栅理论,提出柱面光栅概念,并对其衍射特性和集光本领进行研究。结果表明:在掠入射条件下凹柱面光栅具有与凹球面光栅相似的衍射特性,但凹柱面光栅可以方便地沿光栅母线方向划分成若干相同部分独立工作,因此,安装水平隔板的掠入射凹柱面光栅单色仪可以用于托卡马克等离子体的真空紫外(VUV)光谱时空分辨测量。 相似文献
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刻线误差与面型误差对平面光栅光谱性能影响的二维快速傅里叶变换分析方法 总被引:1,自引:1,他引:0
光栅刻线误差与基底面型误差影响平面光栅衍射波前、分辨本领、鬼线、卫线及杂散光等光谱性能,研究光栅性能指标与光栅刻线误差及基底加工误差之间的因果关系,对提高光栅质量极为重要。根据光栅衍射中产生的源于刻线误差与面型误差的光程差,推导出了在光栅锥面衍射情况下的光栅刻线误差、基底面型误差、入射角θ、衍射级次m与衍射波前关系的数学表达式,得到构建非理想光栅衍射波前的理论模型。以理论模型为依据,采用干涉仪测量光栅对称级次衍射波前,实现在测量结果中对光栅刻线误差与基底面型误差的分离,并基于二维快速傅里叶变换分析光栅衍射波前,考察了刻线误差与面型误差对光栅性能指标的影响。借助此方法通过重构的光栅衍射波前,分析光栅分辨本领、鬼线等光谱性能,还可以反演光栅全表面刻线误差与面型误差的大小,为光栅基底加工、光栅制造和使用技术提供理论依据。 相似文献
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Modal analysis of a deep-etched low-contrast two-port beam splitter grating under Littrow mounting is presented. The guideline for the design of a subwavelength transmission fused-silica phase grating as high-efficiency grating, polarizing beam splitter (PBS), and two-port beam splitter, is summarized. As an example, a polarization-independent two-port beam splitter grating is designed at wavelength of 1064 nm. We firstly analyzed the physical essence of the grating by the simplified modal method. The guideline for the grating design and the approximate grating parameters are obtained. Then using the rigorous coupled-wave analysis (RCWA) with parameters varying around the approximate ones, optimum grating parameters can be determined. With the design guideline, the time for the rigorous calculation of the grating profile parameters can be reduced significantly. 相似文献
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