共查询到19条相似文献,搜索用时 78 毫秒
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基于鬼像和像差分析的高功率激光装置透镜设计 总被引:2,自引:1,他引:1
为了设计能够满足高功率固体激光装置需求的空间滤波器透镜,采用矩阵光学方法,分析光束经过单透镜传输时剩余反射形成各阶鬼像的过程,得到鬼像位置与透镜曲率半径的关系式.该关系式表明,透镜的曲率半径设计可以控制鬼像所在的区域.根据高功率激光装置光路排布的特点简化鬼像分析,利用自行开发的鬼像追迹软件分析了主放大级鬼像分布特点.通过改变透镜的曲率半径和倾斜透镜这两种方式,基于鬼像规避和像差最小化两种原则,最终确定主放大级透镜曲率半径的最优选择为1:3弯月型,凸面朗向光学元件集中的方向.该方法可普遍应用于指导高通量复杂光学系统的透镜设计. 相似文献
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为了对目标的多波段辐射特性进行测量,设计了一套300~1 000nm三波段光学成像系统.该系统共用同一入射窗口,采用两个直角棱镜进行分光,每个波段使用独立的光学成像镜头,能同时得到目标的紫外、可见光和近红外图像.利用LightTools软件对此系统的鬼像进行模拟分析,发现棱镜表面和窗口玻璃之间的光束多次反射之后,经过光学成像镜头聚焦到探测器靶面上,形成了目标的多重鬼像,大大降低了图像的对比度.实验结果表明:采用本文所述方案,三波段成像系统能达到较好的像质;将窗口玻璃和第一个棱镜的角度控制在7″之内可以消除鬼像,对使用棱镜作为分光元件的多波段光学成像系统的设计和研制具有一定的参考意义. 相似文献
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高功率激光系统中鬼光束对元件安全造成威胁 ,并导致主光束质量变坏 ,故鬼光束会聚点的位置和鬼光束会聚光斑光强的定量分析 ,对高功率激光系统安全运行非常重要。根据高斯光束在共轴有限孔径光学系统中的传输变换规律 ,得到了平行光束和同心光束在共轴光学系统中的光斑传输变换公式 ,进而计算了高功率激光系统典型结构单元鬼光束会聚点的位置和鬼光束会聚光斑的光强。结果表明 ,共轴光学系统中鬼点分布都在光轴上 ,单元件构成的系统在未考虑增益介质放大时 ,鬼光束会聚光斑的光强随鬼点阶次的升高下降较快 ,而多元件构成的系统则规律性不明显。 相似文献
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光干涉技术与天文望远镜技术的结合是提高天文观测分辨率的一种有效方法.采用望远镜阵代替单个大口径望远镜来集光观测,利用最大基线的概念来等效传统光学望远镜的最大口径,很大程度上解决了单个望远镜集光能力不足、角分辨率不高的问题.然而对于光干涉来说,在应用中,只有满足:两束光的相位差δ必须相对稳定、存在相互平行的振动分量、频率相同、两光波在相遇点所产生振动的振幅相差不悬殊和两光波在相遇点的光程差(OPD)应在相干长度之内等这些条件时才能部分相干.光学综合孔径(OAS)望远镜产生干涉条纹的前提条件是子望远镜之间必须两两相干.推导了双光束光干涉的要求,并从双光束干涉的平行性和光程差的要求出发,研究并得出光学综合孔径望远镜子望远镜的平行性和光程差的要求.结合双光束干涉的恒星光干涉仪的光束平行性和光程差的调整方案,研究并得到了光学综合孔径望远镜子望远镜的平行性和光程差调整的光学方案,并讨论了该系统的改进措施. 相似文献
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首次提出采用发光二极管和二次光学透镜直接产生单个局域空心光束的方法.首先从几何光学角度分析发光二极管点光源结合二次光学透镜产生局域空心光束的原理,推算出所得局域空心光束长度及最大暗域半径计算公式,随后用数值计算软件Matlab,3D建模软件Soidworks及光学仿真软件Tracepro计算得出一款二次光学透镜并进行了仿真验证.同时计算了可能获得的局域空心光束的最小尺寸和囚禁粒子的散射力.结果显示:该透镜能够产生单个局域空心光束,所得局域空心光束的长度及最大暗域半径都在误差允许范围内与理论计算符合.研究成果为采用发光二极管光源产生局域空心光束提供一种现实可行低成本的有效方法. 相似文献
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Da-ping Wan Xi-chang Liang Fan-ming Meng De-jin Hu Yu-ming Wang Bing-kui Chen Yi-min Shao 《Optics & Laser Technology》2009,41(4):499-503
Flying optics technologies are used for a range of applications such as a large workpiece processing and laser texturing. It is essential to compensate the variations of laser beam focus parameters while the focus head is moving. A flying optics automatic compensation approach is proposed to achieve invariable laser focal size, focus depth and focus position through computer controlled objective lens and focus lens position. A simple mechanical control method is also presented for the realization of constant beam parameters for flying optics. Numerical simulation is illustrated for a CO2 laser texturing application. The flying optics parameters compensation is simple and easy to control. 相似文献
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Suk Zhao B Sung Chung H Cho K Hyup Lee S Hwang S Yu J Ahn YH Sohn JY Kim DS Kyung Kang W Chung DS 《Physical review letters》2000,85(13):2705-2708
A cylindrical molecular lens is formed by focusing a nanosecond IR laser pulse. Trajectories of a CS2 molecular beam deflected by the lens are traced using the velocity map imaging technique. The characteristic lens parameters including the focal length, minimum beam width, and distance to the minimum-width position are determined. The laser intensity dependence of the parameters is in good agreement with theoretical predictions. Exciting possibilities for molecular optics and a new type of optical chromatography are opened up. 相似文献
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The true focal spot of a focusing system may be defined as either the location of the maximum on-axis intensity or the location of the minimum beam diameter that contains a certain fraction of the power. Diffraction causes this true focus to be shifted from the ideal geometrical optics prediction, the effect being greatest at largeF-numbers. Specifically, a theoretical and experimental study is made of the largeF-number focusing properties of a thin lens in contact with a uniformly illuminated aperture. The results are clarified by a comparison to the focal spot shift for a Gaussian beam. 相似文献
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从部分相干光的交叉谱密度函数传输公式出发,推导了高斯谢尔模型(GSM)光束被球差透镜衍射后轴上光强分布的解析公式,并进行了数值模拟和物理分析。结果表明,具有一定束腰宽度和空间相干度的GSM光束经过负球差透镜聚焦后,可以获得轴上光强的均匀分布。通过改变GSM光束的束腰宽度和空间相干度来实现轴上光强均匀分布的方法很简单,转换效率高。 相似文献
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平顶光束通过像散透镜的传输和光束参量的变化 总被引:1,自引:1,他引:0
对平顶光束通过像散透镜的传输和光束参量(包括束宽、束腰宽度和位置、远场发散角和M2因子)的变化做了研究.结果表明,像散使平顶光束在x方向的束腰宽度增加,远场发散角减小,实际焦点的位置远离透镜,而在y方向正相反.平顶光束的M2因子与像散无关.x、y方向束宽和远场发散角的相对误差随光束阶数,瑞利长度,像散系数和透镜焦距变化.当x、y方向的光束阶数和初始束宽相等时,几何焦面上两方向束宽的相对误差相等,但在实际焦面上不同. 相似文献
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Based on the optical coherent theory and the extended Huygens–Fresnel integral, lensless ghost imaging of Multi-Gaussian Schell-model beams through the slant non-Kolmogorov turbulence channels with Z-tilt aberration correction has been studied and the theoretical models have been derived. Our results indicate that the nearer of object to illuminant plane, the larger beam width and the more beamlet number are, the more fine of image quality is. The undersize of illumination light source will cause the quality decline of ghost imaging and the image quality of the object illuminated by the incoherent light are worse than that of illuminated by partially coherent light. 相似文献
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N. V. Chernomyrdin A. O. Shchadko S. P. Lebedev I. E. Spektor V. L. Tolstoguzov A. S. Kucheryavenko K. M. Malakhov G. A. Komandin V. S. Gorelik K. I. Zaytsev 《Optics and Spectroscopy》2018,124(3):428-436
A wide-aperture aspheric lens for focusing a terahertz electromagnetic-radiation beam in a circle of the subwavelength size is proposed. The calculation of the lens and the estimation of size of created caustic were carried out using computational methods of geometric optics and electrodynamics. The lens is made of high-density polyethylene with the help of a turning machine. For experimental estimation of the spatial resolution provided by the lens, a THz imaging system based on raster scanning of the object’s surface was created. The imaging system was used in combination with wide-aperture THz optics to record images of the streak plates with different spatial frequencies. Analysis of the experimental data showed that the aspheric lens allows the resolution of two objects spaced at a distance of 0.95λ, providing contrast of 15%. The proposed THz optics is superior to classical THz spherical lenses and off-axis parabolic mirrors, greatly expanding the capabilities of THz-spectroscopy methods and imaging. 相似文献