Sub-femtosecond precision measurement of relative X-ray arrival time for free-electron lasers

Today's brightest coherent X-ray sources, X-ray free-electron lasers, produce ultrafast X-ray pulses for which full-width at half-maximum durations as short as 3 fs have been measured(1). There has been a marked increase in the popularity of such short pulses now that optical timing techniques have begun to report an X-ray/optical delay below similar to 10 fs r.m.s. errors. As a result, sub-10 fs optical pulses have been implemented at the Linac Coherent Light Source (LCLS) X-ray beamlines, thus warranting a push to reduce the error in X-ray/optical delay measurements to the ifs level. Here, we report a unique two-dimensional spectrogram measurement of the relative X-ray/optical delay. This easily scalable relative delay measurement already surpasses previous techniques by an order of magnitude with its sub-1 fs temporal resolution and opens up the prospect of time-resolved X-ray measurements to the attosecond community.


Published in:
Nature Photonics, 8, 9, 706-709
Year:
2014
ISSN:
1749-4893
Laboratories:




 Record created 2015-03-12, last modified 2018-09-13


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