Open AccessCharacterization of soft X‐ray FEL pulse duration with two‐color photoelectron spectroscopy
Author(s) -
Owada Shigeki,
Fushitani Mizuho,
Matsuda Akitaka,
Fujise Hikaru,
Sasaki Yuuma,
Hikosaka Yasumasa,
Hishikawa Akiyoshi,
Yabashi Makina
Publication year - 2020
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577520008516
Subject(s) - pulse duration , laser , femtosecond , x ray photoelectron spectroscopy , sideband , ultrashort pulse , optics , pulse (music) , photon energy , physics , spectroscopy , atomic physics , photon , materials science , nuclear magnetic resonance , microwave , quantum mechanics , detector
The pulse duration of soft X‐ray free‐electron laser (FEL) pulses of SACLA BL1 (0.2–0.3 nC per bunch, 0.5–0.8 MeV) were characterized by photoelectron sideband measurements. The intensity of the He 1 s −1 photoelectron sidebands generated by a near‐infrared femtosecond laser was measured as a function of the time delay between the two pulses using an arrival time monitor. From the width of the cross‐correlation trace thus derived, the FEL pulse duration was evaluated to be 28 ± 5 fs full width at half‐maximum in the photon energy range between 40 eV and 120 eV.