共查询到20条相似文献,搜索用时 46 毫秒
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利用电控改变固液界面湿润角的电润湿微棱镜(EMPs)技术以及双自聚焦透镜组合设计了一类新颖的可调光衰减器,并对该衰减器的衰减性能进行了原理分析和实验测量.理论分析和实验结果表明其具有良好的光衰减控制效应,在不大的电压变化范围(例如135—139V)内即可实现2—60dB的光衰减范围.该器件构思新颖,具有结构简单、容易制作的优点,经过优化后将会在光通信领域得到广泛的应用.缺点是工作电压偏高,需要进一步筛选出介电系数高的物质来作为介电绝缘层材料,以便降低工作电压,达到实际可以使用的目的.
关键词:
微流控光学
电湿效应
可调光衰减器
电润湿微棱镜 相似文献
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消色差的1/4波长延迟器的几何光学设计 总被引:4,自引:1,他引:4
在许多光谱学测量和实验研究中,常需要一个消色差1/4波长延迟器来满足各种实验测量条件.这可以通过一个在工作波长范围内折射率变化较小的菱型棱镜来实现.为了使用方便,在光学系统中可设计一个具有三个全内反射面的V型棱镜,其总的相位延迟达90°,同时可避免光路偏差.在实际应用中,需对棱镜的尺寸和通光孔径进行优化设计,以达到最佳效果.在本文中,我们给出了具有这种结构的几何设计例子,还结合不同参量成功地设计研制了一个消色差的1/4波长延迟器,并应用于磁光材料的克尔效应测量中.文中给出了详细计算和误差修正,所给出的计算公式可用于其他尺寸的消色差1/4波长器的设计和研制. 相似文献
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椭圆偏振光与部分偏振光的实验验证 总被引:1,自引:0,他引:1
文献[1-2]指出,椭圆偏振光经偏振片后透射光强的平方根√I对于空间方向角的分布曲√I-θ不是椭圆,只有经适当的数据处理才能给出光振动矢量的空间椭圆轨迹.作为椭圆偏振光的验证性实验,已达到了我们的实验目的.然而,部分偏振光与椭圆偏振光在一定条件下经偏振片后的透射光强可以具有完全相同的空间分布.也就是说,我们不能仅用一个偏振片来鉴别部分偏振光与椭圆偏振光.本文在分析了椭圆偏振光与部分偏振光经偏振片后透射光强的基础上,进一步研究了椭圆偏振光与部分偏振光经1/4波片和偏振片后的透射光强,加深了对椭圆偏振光与部分偏振光偏振特性的理解,指出对偏振光的理解中存在的一些模糊认识,这有利于教学内容的深化. 相似文献
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入射角对偏光棱镜光强透射比的影响分析 总被引:1,自引:0,他引:1
标志激光偏光棱镜设计好坏的一个重要指标是棱镜的光强透射比,研究棱镜的光强透射比随入射角的变化有助于了解实验中光线非正入射时带来的光强损失。利用菲涅耳公式并考虑到多束光的干涉,得出了激光偏光棱镜的光强透射比公式,由该公式看出偏光棱镜的光强透射比与光束的入射角,胶合介质的折射率,入射波长,胶合层的厚度,入射面的方位及棱镜的结构角有关。通过对某些参数的合理设定,较系统地讨论了入射角对棱镜光能透射比的影响,得出了棱镜的光强透射比随入射角的变化规律。 相似文献
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Yunxia Dong 《Physics letters. A》2008,372(46):6986-6991
All previous investigations on the Bloch oscillations of waves focus on scalar waves. Here we demonstrate, for the first time, the existence of Bloch oscillations of vector fields for circularly polarized light (CPL) propagating through a designed liquid crystal structure. To obtain the Wannier-Stark ladder of the CPL, we have designed a cholesteric liquid crystal structure with spatially varying pitch. The Bloch oscillations of the CPL have been observed in such a structure by exact numerical simulations. We have also shown that such a phenomenon can be easily detected in time-resolved reflection experiments. 相似文献
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All-optical magnetic recording with circularly polarized light 总被引:1,自引:0,他引:1
Stanciu CD Hansteen F Kimel AV Kirilyuk A Tsukamoto A Itoh A Rasing T 《Physical review letters》2007,99(4):047601
We experimentally demonstrate that the magnetization can be reversed in a reproducible manner by a single 40 femtosecond circularly polarized laser pulse, without any applied magnetic field. This optically induced ultrafast magnetization reversal previously believed impossible is the combined result of femtosecond laser heating of the magnetic system to just below the Curie point and circularly polarized light simultaneously acting as a magnetic field. The direction of this opto-magnetic switching is determined only by the helicity of light. This finding reveals an ultrafast and efficient pathway for writing magnetic bits at record-breaking speeds. 相似文献
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分析了楔形镜和中性玻璃衰减片组对光束的衰减原理,采用反射式楔形镜作为无像差定量衰减器,并同时使用中性玻璃衰减片组微调光束能量。实验测量了LD泵浦激光模式发生器基模和高阶模条件下激光束的M2因子,结果表明:楔形镜反射式衰减器对光束质量无显著影响,将楔形镜第一次表面反射作为无像差定量衰减,入射角在0~55°范围内,单棱镜表面反射光束能量为入射光能量的4.3%,通过多块组合可以得到更大的衰减;可采用中性玻璃衰减片组对激光光束的衰减进行精细控制,使其满足CCD探测器动态范围要求。该结论可为高精度激光参数测量装置光衰减系统的研制提供理论依据。 相似文献
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Attenuation characteristics of a light attenuator combined by polarizers with different extinction ratios 下载免费PDF全文
This paper deals with a systematical analysis and an algorithm of attenuation characteristics of a light attenuator combined by n pieces of polarizers (n-LACP) whose extinction ratios are different from each other.The attenuation ratio expression of a two-LACP is deduced.We find that the monotonic attenuation interval depends on the first polarizer and that the attenuation range depends on the second one.For the three-LACP,a method for obtaining a monotonic attenuation interval is proposed.Moreover,the attenuation ratio expression is demonstrated.Analysis and experiment show that when the initial status of the three-LACP is at the maximum output,if the second or third polarizer rotates alone,the minimum attenuation ratios can reach K-1 2 and K-1 3,respectively,and if the first polarizer rotates,a minimum attenuation ratio of K-1 2 K-1 3 can be obtained (K 1,K 2 and K 3 represent the extinction ratios of the three polarizers in turn).Furthermore,the attenuation ratio expression of n-LACP and the relevant attenuation characteristics are proposed.The minimum attenuation ratio of an n-LACP is (K 2 K 3 ··· K n)-1. 相似文献
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A new effect of magnetization of magnetic insulators due to light absorption by magnetic ions is proposed. The estimates for an yttrium ion garnet crystal are made. 相似文献
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光隔离器用微型晶体偏光棱镜的研制 总被引:1,自引:1,他引:0
本文以光隔离器用偏光棱镜为例介绍了微型晶体偏光棱镜的设计、材料选择以及加工方法。将通光孔径小于5mm的偏光棱镜称为微型棱镜。其结构设计通常遵从常规偏光棱镜的设计方法,但是考虑到器件微型化造成的材料机械强度的降低、加工应力对器件性能的影响以及加工工艺的技术难度的增加等因素,作者在器件结构设计上作了周密地考虑。为配合设计工作,文中相应地详细介绍了材料性能的检测方法,并给出了典型材料的测量数据结果。文中最后部分较为完整具体地介绍了借助晶体靠模技术对微型偏光棱镜实施加工的过程。本文对从事小型精密光学器件设计加工人员有一定的参考作用 相似文献
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Jahnke T Foucar L Titze J Wallauer R Osipov T Benis EP Alnaser A Jagutzki O Arnold W Semenov SK Cherepkov NA Schmidt LP Czasch A Staudte A Schöffler M Cocke CL Prior MH Schmidt-Böcking H Dörner R 《Physical review letters》2004,93(8):083002
Diffraction of a low energy (<4 eV) carbon-K-photoelectron wave that is created inside a CO molecule by absorption of a circularly polarized photon is investigated. The measurements resolve the vibrational states of the K-shell ionized CO+ molecule and display the photoelectron diffraction patterns in the molecular frame. These show significant variation for the different vibrational states. This effect is stronger than predicted by state-of-the-art theory. As this study is performed close to C-K-threshold and, therefore, far below the molecule's sigma-shape resonance, this surprisingly strong effect is not related to that resonance phenomenon. 相似文献