共查询到18条相似文献,搜索用时 140 毫秒
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《光学学报》2015,(6)
在基于夏克-哈特曼波前传感器的深紫外物镜系统波像差检测中,均匀高亮度的照明光束是实现纳米精度波像差检测的关键。采用时域有限差分法和部分相干性理论对随机排列微孔阵列衍射波前的强度对比度进行了优化。与周期排列微孔阵列相比,采用随机排列微孔阵列,可获得更加光滑的衍射波前强度分布;对单个微孔衍射波前的分析表明,微孔直径越大衍射波前强度对比度越大;衍射波前强度对比度在双孔间为74 nm时达到最大值。分析计算得出,为获得满足纳米精度波像差检测强度对比度要求的波前,随机排列微孔阵列中宜采用直径170 nm的微孔,且微孔间距大于等于306 nm,此时,微孔阵列中微孔个数为428,衍射波前强度对比度为11.70。 相似文献
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为保证投影光刻物镜的成像性能并降低制造成本,提出了一种更全面可靠的公差分析方法。该方法在以波像差均方根(RMS)值作为评价标准的传统分析方法基础上,添加波像差峰谷(P-V)值作为评价指标,并据此选择合理的补偿器组合。在系统波像差的RMS值和P-V值均满足要求的情况下,采用了较少的补偿器,从而有效地降低了系统的制造难度和成本。结合实验室设计的一套90nm投影光刻物镜进行了公差分析和补偿器优选。结果表明,利用该方法选择的7个补偿器,使得系统在97.7%置信区间内,全视场波像差的RMS值≤0.0412λ,P-V值≤0.2469λ,满足了90nm投影光刻物镜的像质要求。 相似文献
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《光学学报》2017,(4)
提出了一种基于八角度孤立空检测标记的超高NA光刻投影物镜高阶波像差检测方法。通过对八角度孤立空检测标记的空间像进行主成分分析(PCA)和多元线性回归分析,构建了超高NA光刻投影物镜的空间像光强分布与高阶波像差之间的线性模型,并基于该模型实现了高阶波像差的检测。与使用六角度孤立空检测标记的传统方法相比,本方法提高了光瞳面波前的采样效率,拓展了波像差检测范围,实现了超高NA光刻投影物镜高阶波像差(Z_5~Z_(64))的高精度检测。光刻仿真软件PROLITH的仿真结果表明,该方法可实现60项泽尼克系数(Z_5~Z_(64))的检测,检测精度优于1.03×10~(-3)λ。 相似文献
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The small pinhole of point diffraction interferometer based on pinhole-point diffraction places ultra-high requirement on both the adjustment of testing system and performance of CCD camera. Besides, poor fringe contrast due to the low reflectivity of test spherical surface would limit the measurement precision in the processing of fringe pattern. A modified polarization point diffraction interferometer with extended measurable numerical aperture (NA) is presented for testing the spherical surfaces with low reflectivity. Measurement error factors as well as the corresponding calibration procedure are introduced in detail. Comparing with the results of Zygo interferometer, measurement accuracy with root-mean-square (RMS) value about 0.0026λ and peak-to-valley (PV) 0.0134λ is achieved. The system has good measurement repeatability, and the standard deviation of measurement results RMS better than 0.0010λ is obtained. The proposed interferometer reduces the difficulty in the adjustment of the system and provides a feasible way for testing the surfaces with low reflectivity and high NA. 相似文献
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针孔直径的大小是影响自参考干涉波前传感器测量精度的重要因素,在实际应用中应根据测量精度要求以及强度通过率来选择.首先基于傅里叶光学理论分析了针孔直径对参考波前质量以及强度通过率的影响,然后通过数值仿真和实验对其进行证实.研究结果表明,当针孔直径等于艾里斑直径的一半时可以产生高质量的参考波前,对于峰谷值不小于一个波长的畸变波前,其参考波前的均方根值低于λ/100.这些理论分析和实验结果可为自参考干涉波前传感器的设计和精度分析提供有价值的参考和指导.
关键词:
自适应光学
自参考干涉波前传感器
针孔直径
强度通过率 相似文献
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i线投影光刻曝光系统的光学设计 总被引:3,自引:1,他引:2
叙述具有同轴对准特性的光学投影物镜双远心结构和均匀照明光学系统原理。为了满足i线光刻所需的光学传递函数要求,讨论了光刻分辨率和数值孔径的关系。设计了一种新的双远心投影物镜,其数值孔径NA=0.42,放大倍率M=-1/5,像场尺寸15mm×15mm(直径21·2mm),共轭距L=602mm。用光学设计程序ZEMAX-XE计算此i线物镜的像质。设计结果说明,整个视场内波差<λ/4,MTF>0.55,当空间频率为715pairlines/mm,使用波长为365士3nm时。可以实现0.7μm光刻分辨率;照明均匀器,由81个小方型透镜组成一方列阵。用本文模拟计算软件OPENG计算被照像平面上的光能分布,说明实际系统的照明不均匀性为土2%。 相似文献
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Wei Lu Chenchong He Zhe Chen Junwei Fan Biao Yan 《Applied Physics A: Materials Science & Processing》2012,107(1):149-153
The propagation of a laser beam through a micro-lens array (MLA) was simulated using Finite Time Difference Domain (FDTD)
method. The intensity distribution at different output planes away from the micro-lens array surface was investigated. As
compared to the focal plane, the intensity distribution observed at those out-of-focus planes varies, which is attributed
to the interference and diffraction of output laser beams. The simulated results were counter checked by placing a physical
MLA under an illumination of a 488 nm continuous wave Argon Ion laser and images were captured for different output planes.
Both simulation and experimental results show a great similarity in terms of the distribution patterns. By changing the lens
sag height with respect to the lens diameter, the full width at half maximum (FWHM) of the focused laser spot and its corresponding
maximum energy flux were analyzed. A FWHM of 160 nm can be achieved by proper selection of lens sag height. It is also found
that the energy flux is proportional to numerical aperture (NA). 相似文献
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光刻投影物镜中透镜的面形精度是影响光学系统成像质量的关键因素之一。为实现透镜面形精度均方根(RMS)值优于2nm的高精度指标,提出一种轴向多点挠性支撑、径向三点可调式定位的光学透镜支撑结构。基于自重变形对支撑结构进行优化设计,深入分析在此支撑结构下自重和热载荷对透镜面形影响。结果表明,重力引起的透镜上表面面形RMS值为0.186nm,下表面面形RMS值为0.15nm。热载荷引起的上表面面形RMS值为0.55nm,下表面面形RMS值为0.54nm。采用这种透镜的支撑结构,能够满足光刻投影物镜中透镜的高精度面形要求。 相似文献
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Using a near-field scanning microscope (NT-MDT) with a 100 nm aperture cantilever held 1 μm apart from a microaxicon of diameter 14 μm and period 800 nm, we measure a focal spot resulting from the illumination by a linearly polarized laser light of wavelength λ=532 nm, with its FWHM being equal to 0.58λ, and the depth of focus being 5.6λ. The rms deviation of the focal spot intensity from the calculated value is 6%. The focus intensity is five times larger than the maximal illumination beam intensity. 相似文献
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We report a laser writing system for fabrication of diffractive optical elements with He-Cd laser. The wavelength of the light source is 441.6 nm. The output beam is collimated into parallel light with uniform intensity distribution after passing through the spatial filter with a pinhole of 25μm and the collimating device. A microscopy objective lens with numerical aperture (NA) of 0.65 is used to focus the beam into a small diffraction spot. Any pattern can be written with this system. Experimental results are presented.The written gratings and the phase patterns were verified with a conventional optical microscopy and the Taylor Hobson equipment. 相似文献