报 告 人

于伟威，特聘教授，辽宁师范大学

报告时间

2020年11月17日9点-10点

报告地点

B105

报

告

内

容

简

介

Attosecond pulses in the soft x-ray (SXR)   to water-window energy region offer the tools for creating and studying   target-specific localized inner-shell electrons or holes in materials,   enabling monitoring or controlling charge and energy flows in a dynamic   system on attosecond timescales. Harmonics generated in a gas medium have   attochirps that cannot be fully compensated by materials over a broad   spectral range; thus, realistically what are the typical shortest attosecond   pulses that one can generate? To answer this question, it is essential that the   temporal attosecond pulses be accurately characterized. We introduce the   autocorrelation (AC) of the streaking spectrogram to retrieve attosecond   pulses.By comparing the ACs from the experiments and from the retrieved SXR   pulses, the accuracy of the retrieved results can be directly visualized. Our   retrieval method is fast and accurate, and it shall provide a powerful tool   for the metrology of the emerging few-ten-attosecond pulses.

报告专家：于伟威，博士，硕士生导师。主要从事激光与物质相互作用研究，主持国家自然科学基金、国家留学基金多项，在Phys. Rev. Applied、Phys.   Rev. A等期刊发表SCI论文十多篇。本次报告主要涉及利用光电子条形谱的自关联提取阿秒脉冲相位。

承办学院

医药化工与材料工程学院

发布日期

2020年11月16日

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