15 October 2012 Spectral encoding based measurement of x-ray/optical relative delay to ~10 fs rms
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A recently demonstrated single-shot measurement of the relative delay between x-ray FEL pulses and optical laser pulses has now been improved to ~10 fs rms error and has successfully been demonstrated for both soft and hard x-ray pulses. It is based on x-ray induced step-like reduction in optical transmissivity of a semiconductor membrane (Si3N4). The transmissivity is probed by an optical continuum spanning 450 - 650 nm where spectral chirp provides a mapping of the step in spectrum to the arrival time of the x-ray pulse relative to the optical laser system.
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Mina R. Bionta, Mina R. Bionta, Doug French, Doug French, James P. Cryan, James P. Cryan, James M. Glownia, James M. Glownia, Nick Hartmann, Nick Hartmann, David J. Nicholson, David J. Nicholson, Kevin Baker, Kevin Baker, Christoph Bostedt, Christoph Bostedt, Marco Cammarrata, Marco Cammarrata, Matthieu Chollet, Matthieu Chollet, Yuantao Ding, Yuantao Ding, David M. Fritz, David M. Fritz, Steve M. Durbin, Steve M. Durbin, Yiping Feng, Yiping Feng, Marion Harmand, Marion Harmand, Alan R. Fry, Alan R. Fry, Daniel J. Kane, Daniel J. Kane, Jacek Krzywinski, Jacek Krzywinski, Henrik T. Lemke, Henrik T. Lemke, Marc Messerschmidt, Marc Messerschmidt, Daniel F. Ratner, Daniel F. Ratner, Sebastian Schorb, Sebastian Schorb, Sven Toleikis, Sven Toleikis, Diling Zhu, Diling Zhu, William E. White, William E. White, Ryan N. Coffee, Ryan N. Coffee, } "Spectral encoding based measurement of x-ray/optical relative delay to ~10 fs rms", Proc. SPIE 8504, X-Ray Free-Electron Lasers: Beam Diagnostics, Beamline Instrumentation, and Applications, 85040M (15 October 2012); doi: 10.1117/12.929097; https://doi.org/10.1117/12.929097

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