【摘 要】
:
Residual stress, which can be inevitably introduced during the optical films deposition process, must be controlled in many applications since the surface deformation is caused. The residual stress is traditionally controlled by adjusting the process para
【出 处】
:
ChineseOpticsLetters
论文部分内容阅读
Residual stress, which can be inevitably introduced during the optical films deposition process, must be controlled in many applications since the surface deformation is caused. The residual stress is traditionally controlled by adjusting the process parameters. However, the process parameters are determined by other more desired properties in many fields. In these cases, layer structure is the only variable to change the residual stress status of the components. Ta2O5/SiO2 is most commonly used material pair in visible/near infrared (VIS/NIR) region. In this letter, stress behaviors of Ta2O5 and SiO2 single layers deposited by ion-assisted deposition (IAD) are studied. Stress-thickness linear correlation curves of the two materials are obtained, which agree with the commonly reported linear results. Based on these features, a kind of antireflection (AR) coating acted as back side coating is designed to control the residual stress of components by the layer structure designing. A series of AR coatings at 1 319 nm are designed, according to residual stress status desired to introduce.
其他文献
In order to improve the characteristics of the general broad-waveguide 808-nm semiconductor laser diode (LD), we design a new type quantum well LD with an asymmetric cladding structure. The structure is grown by metal organic chemical vapor deposition (MO
能提供彩色实时图象或数据的大屏激光信息显示系统已由美国德克萨斯仪器公司设备部研制成功。此种仪器为该公司自费研究,以满足指挥-控制系统的需要。在纽约举行的1966年国际电气与电子学工程师学会会议与展览会上,该公司首先展出一台屏面为30×40吋的工作样机。
Conventionally, metallic nanostructures are used for surface-enhanced Raman spectroscopy (SERS), but recently there has been increasing interest in the enhancement of Raman scattering from dielectric substrates due to their improved stability and biocompa
提出一种稳健的两阶段层次匹配稳像算法, 在频域结合相位相关和谱对消技术对抖动图像序列间的平移和旋转矢量获得亚像素估计精度。算法第一阶段首先在对数极坐标表示下, 利用相位相关法得到图像帧间的旋转角度和整数像素平移参数; 算法第二阶段运用谱对消技术确定亚像素平移参数。在建立参数运动模型的基础上,通过自适应均值滤波确定各帧修正矢量。实验结果表明, 该方法具有亚像素级的稳像精度。
美帝西屋防御和航空中心已制成第一台火力控制激光雷达样机。它能发现为避开微波雷达的搜索而紧贴地面飞行的目标。该公司的掺钕玻璃激光器已成功地进行了试验。
本底噪声是制约干涉型光纤矢量水听器系统在低频远距离目标探测领域中应用的重要因素之一。为降低系统的本底噪声,提出了一种基于自适应噪声抵消的降噪方法。在光学系统中增加一个与传感迈克耳孙干涉仪结构参数相等的对声压不敏感的参考干涉仪作为参考通道,以获得由光源与电路等共同噪声源引入到各干涉仪的高相关噪声。然后,使用归一化均方根误差的自适应算法分别对声压及加速度信号中与参考信号高相关的噪声部分进行抵消。湖试数据的分析结果表明,该方案能够有效降低系统本底噪声,其中对电磁干扰带来的50 Hz倍频信号的抑制能力高达15~2
棱镜-薄膜耦合结构是单侧镀电介质膜的双棱镜结构中的一种,在光信号传输方面具有十分重要的作用。利用稳态相位法分析了这种结构中反射和透射光束的Goos-Hnchen位移,研究结果表明,反射和透射光束的Goos-Hnchen位移随薄膜厚度或入射角的增大除出现共振峰外,还存在反射光束的Goos-Hnchen位移共振峰为负值的新现象。在共振点处透射和反射光束的正向或负向位移量最大可达百余波长。这一结构中薄膜和入射角对光束Goos-Hnchen位移的调制在设计新型光位移调制和光传感器件中具有潜在的应用。
铝锂合金是一种理想的轻质高强结构材料, 在航天航空、兵器工业等高新科技领域具有广阔的应用前景。采用Slab型CO2激光器对1420铝锂合金进行焊接, 研究了填充材料和焊后热处理对焊接接头力学性能的影响。结果表明, 焊态下1420铝锂合金接头强度系数可达到90%, 焊后热处理获得了力学性能良好的焊接接头。
In this Letter, we propose a novel three-dimensional(3D) color microscopy for microorganisms under photonstarved conditions using photon counting integral imaging and Bayesian estimation with adaptive