基于相关法的哈特曼图像网格自动划分方法

在哈特曼波前测量过程中,需要对哈特曼图像进行网格划分用于计算波前斜率。传统的网格划分方法通过观察哈特曼图像手动调整网格位置和网格间距。该方法不但需要人工干预,还给波前实时测量带来困难。为实现哈特曼图像网格划分的自动化,研究了基于相关法的哈特曼图像网格自动划分方法。该方法首先对哈特曼图像进行自相关求取网格行列数以及网格间距,然后利用该网格建立相应的模拟光斑图像,最后对模拟光斑图像和哈特曼图像进行互相关求取网格最佳位置。该方法无需人工干预,耗时短,实现了网格实时自动划分。     

Design optimization of highly efficient spectrum-splitting and beam-concentrating diffractive optical element for lateral multijunction solar cells

Two improved algorithms are proposed to extend a diffractive optical element （DOE） to work under the broad spec- trum of sunlight. An optimum design has been found for the DOE, with a weighted average optical efficiency of about 6.8% better than that of the previous design. The optimization of designing high optical efficiency DOEs will pave the way for future designs of high-efficiency, low-cost lateral multijunction solar cells based on such a DOE.     

折衍二元光学用金刚石车刀设计

栏光效应是影响折衍元件衍射效率的一个重要因素,栏光效应与加工刀具有着密切的关系。分析刀具圆弧半径与栏光效应的联系、刀具参数与元件加工后的表面粗糙度的关系以及刀具耐用度等要求,设计了加工折衍二元光学元件的金刚石刀具,给出刀具加工里程数计算公式和车削实验结果。实验结果证明:设计的金刚石刀具能够满足折衍二元光学元件的产业化加工要求,刀具耐用度较强化前提高2倍多。     

数字掩模制作控制系统误差特性研究

数字化掩模制作系统的核心控制部件是数字微镜。文中系统分析了数字微镜控制系统对数字化掩模制作系统精度的影响。指出误差来源主要为数字微镜帧刷新率、像素黑栅效应、像素量化和调制非线性等因素,并分别提出了相应的误差修正或补偿方法。提高系统的精缩倍数、像素分辨率以及占空比,可以降低这些误差来源的影响。     

ICF系统全光路像差测量与校正方法

介绍一种新的像差探测方法,该方法能够探测整个惯性约束聚变（ICF）光学系统的像差。驱动变形镜调制各种不同的像差加入ICF光学系统,从而导致远场的焦斑变化,此时将CCD放置到远场探测焦斑强度,同时采用哈特曼-夏克波前传感器在近场探测系统像差变化量。根据不同的系统像差变化量以及与其对应的远场强度,利用改进的相位反演算法可以计算出整个光学系统的像差。数值模拟表明,该方法可以测量并校正整个ICF系统的光学像差。     

A generalization of Borel's theorem and microlocal Gevrey regularity in involutive structures

In this paper, we use Borel's procedure to construct Gevrey approximate solutions of an initial value problem for involutive systems of Gevrey complex vector fields. As an application, we describe the Gevrey wave-front set of the boundary values of approximate solutions in wedges W of Gevrey involutive structures (M,V). We prove that the Gevrey wave-front set of the boundary value is contained in the polar of a certain cone ΓT(W) contained in RV∩TX where X is a maximally real edge of W. We also prove a partial converse.     

实现Nd:YAG光束匀滑的衍射光学器件的研制

采用爬山-模拟退火混合优化算法与旋转镂空掩模板工艺,针对基频光与三倍频光,设计并加工出口径80mm的连续位相衍射光学器件。在脉冲工作的Nd：YAG激光器上,实验研究了器件的光束匀滑性能,获得了与设计尺寸相符合、边缘陡峭、但包含较大顶部调制的光斑。初步验证了衍射光学器件在固体激光器光束匀滑上的应用可行性。     

菲涅耳区衍射光学束匀滑器件的设计

采用精细化设计方法,进行了菲涅耳区衍射光学束匀滑器件的设计,利用爬山-模拟退火混合优化算法,获得了真实的束匀滑分布,不仅控制了算法采样点上的光强分布,还控制了其他非采样点上的光强分布。优化得到的束匀滑器件的位相深度小于π,易于后续加工。     

Focal plane wave-front sensing algorithm for high-contrast imaging

High-contrast imaging provided by a coronagraph is critical for the direction imaging of the Earth-like planet orbiting its bright parent star. A major limitation for such direct imaging is the speckle noise that is induced from the wave-front error of an optical system. We derive an algorithm for the wave-front measurement directly from 3 focal plane images. The 3 images are achieved through a deformable mirror to provide specific phases for the optics system. We introduce an extra amplitude modulation on one deformable mirror configuration to create an uncorrelated wave-front, which is a critical procedure for wave-front sensing. The simulation shows that the reconstructed wave-front is consistent with the original wave-front theoretically, which indicates that such an algorithm is a promising technique for the wave-front measurement for the high-contrast imaging. Supported by the National Natural Science Foundation of China (Grant No. 10873024)     

Volume Images Vector Display Based on a Diffractive Screen

A white light system based on a 65 cm × 35 cm diffractive screen is demonstrated to be capable of displaying three-dimensional figures with continuous horizontal parallax. Three computer-controlled mirrors and a diffractive-refractive optical system are employed for positioning each element of the figure. No visual accessories are necessary and more than one observer can watch it simultaneously.