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Achieving few-femtosecond time-sorting at hard X-ray free-electron lasers.

Abstract : Recently, few-femtosecond pulses have become available at hard X-ray free-electron lasers. Coupled with the available sub-10 fs optical pulses, investigations into few-femtosecond dynamics are not far off. However, achieving sufficient synchronization between optical lasers and X-ray pulses continues to be challenging. We report a 'measure-and-sort' approach, which achieves sub-10 fs root-mean-squared (r.m.s.) error measurement at hard X-ray FELs, far beyond the 100-200 fs r.m.s. jitter limitations. This timing diagnostic, now routinely available at the Linac Coherent Light Source (LCLS), is based on ultrafast free-carrier generation in optically transparent materials. Correlation between two independent measurements enables unambiguous demonstration of ~6 fs r.m.s. error in reporting the optical/X-ray delay, with single shot error suggesting the possibility of reaching few-femtosecond resolution.
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Contributor : Muriel Cadieu <>
Submitted on : Friday, May 24, 2013 - 1:35:28 PM
Last modification on : Wednesday, January 13, 2021 - 9:40:37 AM



M. Harmand, R. Coffee, Mina Bionta, M. Chollet, D. French, et al.. Achieving few-femtosecond time-sorting at hard X-ray free-electron lasers.. Nature Photonics, Nature Publishing Group, 2013, 7, pp.215-218. ⟨10.1038/NPHOTON.2013.11⟩. ⟨hal-00825702⟩



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