激光与与国防

来源 :激光与光电子学进展 | 被引量 : 0次 | 上传用户:fchbo
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
多年来,人们以很大的兴趣考虑造出能够摧毁弹道导弹的激光系统的可能性。由于光脉冲可在瞬间由光源打到靶面,这一设想一直有很大的吸引力。事实上,在今天激光武器对人们的吸引力在许多方面仍和以前一样强。实现这一设想的困难在于能源及/或大气层中传输问题。
其他文献
As virtual networks services emerge increasingly with higher diversification, the issue of spectrum fragments presents great challenge to the elastic optical networks (EON), especially under heaven services burdens. Aimed to solve this problem, this artic
期刊
针对现有曲面采样点云法向传播方法难以快速处理大规模数据的问题,提出了一种在多层黎曼图中统一点云法向的方法。该方法对点云进行子集递归划分得到核心点集,以核心点集的曲面变分程度控制递归次数,为点云构造树状多分辨率模型。自上而下遍历点云多分辨率模型的结点,为非叶结点包含的子集构建黎曼图,从而构成点云的多层黎曼图。以先序遍历的方法将顶层黎曼图中样点法向一致性向下逐层传递,在各黎曼图单元内,以最小生成树算法实现样点法向的一致性传播。实验结果表明,对于大规模点云,该方法能有效提高计算效率与内存利用率,且能保证样点法向
期刊
In experiments on newborn rats with stress-related intracranial hemorrhage (ICH) using Doppler optical coherence tomography (DOCT) we have shown that latent stage of ICH (4 h after stress) is characterized by decrease of venous blood outflow and the loss
We numerically performed wave dynamical simulations based on the Maxwell–Bloch (MB) model for a quadrupole-deformed microcavity laser with spatially selective pumping. We demonstrate the appearance of an asymmetric lasing mode whose spatial pattern violat
By designing the ordered structure on the key physical dimensions, metamaterial can obtain extraordinary physical properties. The method gives transparent conductive absorbing metamaterial with broadband and high absorptivity. In this paper, a kind of abs
期刊
由于手指静脉位于皮下,手指中的生物组织、手指解剖结构、皮肤结构成像特性等固有原因都给手指静脉成像造成不利影响。针对手指静脉图像中普遍存在的局部血管残缺问题,首次提出一种指静脉红外图像血管网络修复方法。首先,利用多尺度Gabor滤波对手指静脉图像进行增强,减少图像整体退化性模糊;然后,对指静脉图像进行二值化并提取血管骨架网,以便对血管网络缺损位置进行判断;再将提取的血管骨架端点、二分叉点作为血管骨架
期刊
Until now, there are few reports on the effect of process conditions on abrasion resistance, which is the most important mechanical property of optical films. Broadband antireflective (AR) films composed of SiO2and TiO2, whose bands are from 620 to 860 nm
国际电话电报公司工业实验室的工作者将他们的F4003型光电倍增管加以特殊改变,提高了光电管对于激光束的响应。令入射激光束在表面层的两个面之间往返多次,光阴极的量子效率便比激光束垂直入射时高好几倍。
期刊