沙龙名称：齐心抗疫 学术先行—物光院青年教师沙龙系列学术报告 (四)
沙龙时间：1月13日15:00
沙龙地点：腾讯会议直播（ID：583 8910 3963）
主办单位：物理与光电工程集团
报告1：高功率光纤激光相干合成
讲座人介绍：
廖家莉，全球十大赌船网站物理与光电工程集团讲师，硕士生导师，主要研究方向为硅基光电子器件、光学相控阵和激光相干合成等。主持和参与了国家自然科学基金，陕西省自然基金，国家重点实验室基金和军科委项目等多项国家级和省部级科研项目，在Photonics Research、Optics Letters、Optics Express等国内外重要学术期刊发表论文20余篇，获国家发明专利授权3项。
讲座内容：
高光束质量(BQ)、高功率光纤激光在生物医学、工业加工和国防科技等方面具有广泛的应用需求。由于非线性效应、热损伤及泵浦源亮度等因素的影响，单根光纤激光输出功率存在极限。基于相干合成的高能激光系统能够同时解决亮度和热管理两个难题，已经成为高能激光系统发展的重要方向。本报告首先介绍光纤激光相干合成的发展和关键技术，然后介绍本课题组在相干合成系统中阵列排布和孔径填充优化方面的研究进展。
报告2：Ultrafast image-based Dynamic Light Scattering to measure size and shape of nanoparticles
讲座人介绍：
Paul Yann Briard博士毕业于法国国立应用科学集团鲁昂分院(INSA de Rouen, France)，博士期间师从广义米理论提出者之一Gerard Grehan教授，在其指导下共同提出了用于粒子群参数反演和探测的傅里叶干涉成像技术，期间深度参与欧盟联合项目“INTERREG Iva”低碳燃烧研究。博士毕业后先后在全球十大赌船网站和上海理工大学以博士后研究员身份工作，主持完成了中国博士后科学研究基金，2018年入职全球十大赌船网站物理与光电工程集团，2020年获批科技部外国青年人才计划项目，2021年获批陕西省外国专家服务计划项目，发表学术论文20余篇。
讲座内容：
Nanoparticles are studied for their thermal, electrical, and mechanical properties, and so on. To study the nanoparticles and their properties, their size and shape need to be measured. We are developing and extending the ultrafast image-based dynamic light scattering (UIDLS), a technique derived from conventional dynamic light scattering. The UIDLS was developed to measure the particle size distribution of nanoparticles and it has the potential to determine the characteristic information about the shape distributions of a sample of nanoparticles (which could be spherical or non-spherical) in a faster and less expensive way than the electron microscopy techniques.
In a UIDLS experiment, the nanoparticles are in Brownian motion in a solvent such as water. They are illuminated by a focused Gaussian beam and they scatter the light toward a camera. The cross-correlation coefficients between the pairs of pictures recorded by the camera at different times describe the fluctuations of the light scattered by the nanoparticles, which depends on the size and the shape of the particles.
Our presentation will describe our work in progress in the development of the UIDLS technique, the numerical simulation of a UIDLS experiment, and how the translational and the rotational Brownian motion of the nanoparticles are investigated to measure information about the size and the shape of the nanoparticles.
