Femtosecond optical/hard X-ray timing diagnostics at an FEL: implementation and performance

Henrik T. Lemke; Matt Weaver; Matthieu Chollet; Joseph Robinson; James M. Glownia; Diling Zhu; Mina R. Bionta; Marco Cammarata; Marion Harmand; Ryan N. Coffee; David M. Fritz

doi:10.1117/12.2017603

3 May 2013 Femtosecond optical/hard X-ray timing diagnostics at an FEL: implementation and performance

Henrik T. Lemke, Matt Weaver, Matthieu Chollet, Joseph Robinson, James M. Glownia, Diling Zhu, Mina R. Bionta, Marco Cammarata, Marion Harmand, Ryan N. Coffee, David M. Fritz

Author Affiliations +

Proceedings Volume 8778, Advances in X-ray Free-Electron Lasers II: Instrumentation; 87780S (2013) https://doi.org/10.1117/12.2017603
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

The development of Free Electron Lasers has opened the possibility to investigate ultrafast processes using femtosecond hard x-ray pulses. In optical/x-ray light pump/probe experiments, however, the time resolution is mainly limited by the ability to synchronize both light sources over a long distance (<100 fs FWHM) rather than their pulse length (<10 fs FWHM). We have implemented a spectrally encoding x-ray to optical laser timing diagnostic into the XPP beamline at LCLS with a timing uncertainty down to 10 fs. An x-ray induced change of refractive index in a solid target is temporally probed for single pulses by a chirped white light pulse [4]. By resorting single shot data to the timestamps obtained by the diagnostics, the temporal data quality can be improved to basically pulse length limited time resolution. By interchangable targets and adjustable x-ray and laser foci, the method was successfully applied for very different x-ray parameters. These are different photon energies in the range of 6-20 keV, which at LCLS also includes application of 3rd Harmonic radiation, pulse energy, and bandwidth, when using a Si(111) monochromator.

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Henrik T. Lemke, Matt Weaver, Matthieu Chollet, Joseph Robinson, James M. Glownia, Diling Zhu, Mina R. Bionta, Marco Cammarata, Marion Harmand, Ryan N. Coffee, and David M. Fritz "Femtosecond optical/hard X-ray timing diagnostics at an FEL: implementation and performance", Proc. SPIE 8778, Advances in X-ray Free-Electron Lasers II: Instrumentation, 87780S (3 May 2013); https://doi.org/10.1117/12.2017603

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