Speakers
Description
First tunable, phase-locked, ultrafast hard X-ray (PHLUX) pulse pairs were generated at PAL-XFEL. A fresh-bunch self-seeded FEL, driven by an electron beam that was shaped with a slotted foil and a corrugated wakefield structure, generates coherent radiation that is intensity-modulated on the femtosecond time scale. We measure a stable frequency comb generated by a phase-locked pulse pair (to within a shot-to-shot phase jitter corresponding to 0.1 attoseconds) at a photon energy of 8.3 keV, with a pulse energy of several tens of microjoules, a freely tunable relative phase, a pulse delay tunability between 5 and 17 fs, and an individual pulse duration at the few-femtosecond level. Such pulse pairs are suitable for a wide range of applications, including coherent spectroscopy and hard X-ray quantum optics experiments. More generally, these results represent an important step towards a hard X-ray arbitrary waveform generator.
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