Determination of the pulse duration of an x-ray free electron laser using highly resolved single-shot spectra.
We determined the pulse duration of x-ray free electron laser light at 10 keV using highly resolved single-shot spectra, combined with an x-ray free electron laser simulation. Spectral profiles, which were measured with a spectrometer composed of an ultraprecisely figured elliptical mirror and an analyzer flat crystal of silicon (555), changed markedly when we varied the compression strength of the electron bunch. The analysis showed that the pulse durations were reduced from 31 to 4.5 fs for the strongest compression condition. The method, which is readily applicable to evaluate shorter pulse durations, provides a firm basis for the development of femtosecond to attosecond sciences in the x-ray region.
RIKEN SPring-8 Center, Kouto 1-1-1 Sayo, Hyogo 679-5148, Japan. inubushi@spring8.or.jp
Yuichi
Y
Inubushi
Kensuke
K
Tono
Tadashi
T
Togashi
Takahiro
T
Sato
Takaki
T
Hatsui
Takashi
T
Kameshima
Kazuaki
K
Togawa
Toru
T
Hara
Takashi
T
Tanaka
Hitoshi
H
Tanaka
Tetsuya
T
Ishikawa
Makina
M
Yabashi
D004583:Electrons; D007834:Lasers; D008962:Models, Theoretical; D012825:Silicon / Q000737:chemistry; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods*; D014965:X-Rays
D012825:Silicon