光热辐射测量技术应用于材料物性和缺陷的无损检测

描述了光热辐射测量术的特点、原理和测量装置，并扼要介绍了材料热扩散率、材料表面伤痕和内部缺陷的无损检测。     

云纹技术测量透镜焦距和折射率

本文给出会聚球面波光场下Talbot长度的计算公式和用云纹技术测量透镜焦距和折射率的一种新方法,避免了近两年来提出的方法不足之处。     

液体中脉冲激光的光声偏折技术

本文导出了TEM_(00)脉冲激光引起的液体中温度场的分布和光声脉冲压力的表达式.讨论了激光脉冲持续时间,激光束宽度对压力信号的影响.采用高斯光束光斑偏折技术所得实验结果与理论很好地符合.为流体热力学参量非接触实时检测提供了一种新颖的光学方法.     

石墨烯上外延GaN薄膜的取向演变研究

本文研究了在石墨烯上生长GaN薄膜时晶体取向的变化.采用AlN成核层辅助生长,GaN由取向相差较大的小晶粒,逐渐合并为与石墨烯取向一致的晶粒,最终形成了约4.6μm厚的GaN薄膜.通过EBSD和XRD证实了GaN晶体取向一致性的提高,拉曼光谱也表明GaN晶体的高质量.     

光热辐射技术中二次谐波的特性研究

本文从理论和实验上讨论了光热辐射技术中二次谐波振幅和位相的频率特性，随样品厚度的变化特性以及随激励光功率的变化特性并与基波信号作了比较。     

Large aperture phase-coded diffractive lens for achromatic and 16° field-of-view imaging with high efficiency

Diffractive lenses (DLs) can realize high-resolution imaging with light weight and compact size. Conventional DLs suffer large chromatic and off-axis aberrations, which significantly limits their practical applications. Although many achromatic methods have been proposed, most of them are used for designing small aperture DLs, which have low diffraction efficiencies. In the designing of diffractive achromatic lenses, increasing the aperture and improving the diffraction efficiency have become two of the most important design issues. Here, a novel phase-coded diffractive lens (PCDL) for achromatic imaging with a large aperture and high efficiency is proposed and demonstrated experimentally, and it also possesses wide field-of-view (FOV) imaging at the same time. The phase distribution of the conventional phase-type diffractive lens (DL) is coded with a cubic function to expand both the working bandwidth and the FOV of conventional DL. The proposed phase-type DL is fabricated by using the laser direct writing of grey-scale patterns for a PCDL of a diameter of 10 mm, a focal length of 100 mm, and a cubic phase coding parameter of 30π. Experimental results show that the working bandwidth and the FOV of the PCDL respectively reach 50 nm and 16° with over 8% focusing efficiency, which are in significant contrast to the counterparts of conventional DL and in good agreement with the theoretical predictions. This work provides a novel way for implementing the achromatic, wide FOV, and high-efficiency imaging with large aperture DL.