Sagnac效应对光纤时间传递精度的影响分析EI北大核心CSCD

分析了光纤时间传递中Sagnac效应产生的原因,详细推导了地球表面任意两点间Sagnac效应授时误差的计算公式,仿真研究了Sagnac效应对光纤时间传递精度的影响。结果表明,Sagnac效应授时误差取决于光纤的纬度及其轨迹,当进行长距离时间传递时其误差值可能达到纳秒量级,必须对Sagnac效应进行精确的时延补偿或校准。     

刚性-柔性体系自组装的研究进展

刚性-柔性体系中刚柔链段间的择优取向竞争使其很容易通过自组装形成如球形、棒状、囊泡等多种形态的纳米有序结构,因此该体系的研究引起了人们广泛的关注。本文对各种不同类型的刚性-柔性体系及制备过程进行了介绍与总结,详尽总结了刚性-柔性体系在各种溶液中的不同自组装行为和相应机理,并对近年发展较为迅猛的超分子刚性-柔性复合物体系进行了重点论述。最后,对刚性-柔性体系自组装研究中存在的问题和发展前景进行了展望。     

Automatic measurement device of laser-induced damage threshold and its experiment北大核心

A set of 1 064 nm and 532 nm automatic measurement device of laser-induced damage threshold (LIDT) of dual-wavelength optical elements was designed and constructed for automatic detection of LIDT of optical elements film. The device was mainly composed of pulsed laser light source, beam parameter diagnosis component, damage online diagnosis component, scanning motion platform for parts to be tested and control system. The whole measuring device and measurement process were automatically controlled by the computer integrated measuring software based on Labview, which could realize the automatic measurement of damage threshold in the range of energy density from 0.1 J/cm2～100 J/cm2, and the device was also used to measure the 1 064 nm antireflection film and aluminum reflection film samples. The results show that the damage thresholds are 27.09 J/cm2 and 3.21 J/cm2, with a relative uncertainty of 3.91% and 5.61%, respectively. © 2023 Editorial office of Journal of Applied Optics. All rights reserved.