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利用硬X射线分束与延迟技术实现的双脉冲散斑对比度关联以及近乎傅里叶变换极限的自由电子激光光。

Double-pulse speckle contrast correlations with near Fourier transform limited free-electron laser light using hard X-ray split-and-delay.

作者信息

Roseker Wojciech, Lee Sooheyong, Walther Michael, Lehmkühler Felix, Hankiewicz Birgit, Rysov Rustam, Hruszkewycz Stephan O, Stephenson G Brian, Sutton Mark, Fuoss Paul H, Sikorski Marcin, Robert Aymeric, Song Sanghoon, Grübel Gerhard

机构信息

Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany.

Frontier in Extreme Physics, Korea Research Institute of Standards and Science, Daejeon, 305-340, Republic of Korea.

出版信息

Sci Rep. 2020 Mar 19;10(1):5054. doi: 10.1038/s41598-020-61926-y.

DOI:10.1038/s41598-020-61926-y
PMID:32193442
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7081363/
Abstract

The ability to deliver two coherent X-ray pulses with precise time-delays ranging from a few femtoseconds to nanoseconds enables critical capabilities of probing ultra-fast phenomena in condensed matter systems at X-ray free electron laser (FEL) sources. Recent progress made in the hard X-ray split-and-delay optics developments now brings a very promising prospect for resolving atomic-scale motions that were not accessible by previous time-resolved techniques. Here, we report on characterizing the spatial and temporal coherence properties of the hard X-ray FEL beam after propagating through split-and-delay optics. Speckle contrast analysis of small-angle scattering measurements from nanoparticles reveals well-preserved transverse coherence of the beam. Measuring intensity fluctuations from successive X-ray pulses also reveals that only single or double temporal modes remain in the transmitted beam, corresponding to nearly Fourier transform limited pulses.

摘要

能够产生两个具有从几飞秒到纳秒精确时间延迟的相干X射线脉冲，使得在X射线自由电子激光（FEL）源处探测凝聚态物质系统中的超快现象成为可能。硬X射线分裂和延迟光学技术的最新进展为解决以前的时间分辨技术无法触及的原子尺度运动带来了非常有前景的前景。在这里，我们报告了对硬X射线FEL光束在通过分裂和延迟光学元件传播后的空间和时间相干特性进行表征的情况。对来自纳米颗粒的小角散射测量进行散斑对比度分析，揭示了光束良好保留的横向相干性。测量连续X射线脉冲的强度波动还表明，透射光束中仅保留了单时间或双时间模式，这对应于近傅里叶变换极限脉冲。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/aef81d0fb538/41598_2020_61926_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/3bb4dab73fe1/41598_2020_61926_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/0a79696bc317/41598_2020_61926_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/6c41d32fcd1e/41598_2020_61926_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/aef81d0fb538/41598_2020_61926_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/3bb4dab73fe1/41598_2020_61926_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/0a79696bc317/41598_2020_61926_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/6c41d32fcd1e/41598_2020_61926_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b35/7081363/aef81d0fb538/41598_2020_61926_Fig4_HTML.jpg

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