Determination of the Pulse Duration of an X-Ray Free Electron Laser Using Highly Resolved Single-Shot Spectra

作者：Inubushi Yuichi^*; Tono Kensuke; Togashi Tadashi; Sato Takahiro; Hatsui Takaki; Kameshima Takashi; Togawa Kazuaki; Hara Toru; Tanaka Takashi; Tanaka Hitoshi; Ishikawa Tetsuya; Yabashi Makina

来源：Physical Review Letters, 2012, 109(14): 144801.

DOI：10.1103/PhysRevLett.109.144801

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.

• 出版日期2012-10-1