High-Sensitivity X-Ray Optical Cross-Correlator for Next Generation Free-Electron Lasers

We designed a novel X-ray arrival time monitor that cross-correlates X-ray and 1550 nm optical pulses used in state-of-the-art femtosecond timing distribution systems. We exploit an interferometric detection scheme and etalon effects in thin-film Germanium to achieve unprecedented high sensitivity to soft X-rays. © 2019 The Author(s)