Second-order autocorrelation of XUV FEL pulses via time resolved two-photon single ionization of He.-猫眼课题宝

DOI：

10.1364/oe.19.021698

发表时间：

2011-10

期刊：

Optics express

影响因子：

3.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

R. Moshammer;T. Pfeifer;Artem Rudenko;Yuhai Jiang;L. Foucar;M. Kurka;K. Kühnel;C. Schröter;J. Ullrich;O. Herrwerth;Matthias F. Kling;XiaoJun Liu;K. Motomura;H. Fukuzawa;A. Yamada;K. Ueda;K. L. Ishikawa;K. Nagaya;H. Iwayama;A. Sugishima;Y. Mizoguchi;S. Yase;Makoto Yao;N. Saito;A. Belkacem;M. Nagasono;A. Higashiya;M. Yabashi;Tetsuya Ishikawa;H. Ohashi;H. Kimura;T. Togashi

利用分镜延迟级结合高分辨率反冲-离子动量谱（COLTRIMS）对20.45 eV双光子单电离He进行了时间和动量分辨探测，记录了来自Spring-8紧凑型SASE源（SCSS）的XUV自由电子激光脉冲的二阶自相关光谱。从自相关轨迹中，我们提取了相干时间为8±2 fs，平均脉冲持续时间为28±5 fs，比基于电子束长度测量的估计要短得多。部分相干模型内的模拟[Opt. Lett. 35, 3441(2010)]与实验结果一致，如果考虑到穿过FEL光束直径的脉冲前倾斜，将导致两个脉冲副本之间约6 fs的时间偏移。

Second-order autocorrelation spectra of XUV free-electron laser pulses from the Spring-8 Compact SASE Source (SCSS) have been recorded by time and momentum resolved detection of two-photon single ionization of He at 20.45 eV using a split-mirror delay-stage in combination with high-resolution recoil-ion momentum spectroscopy (COLTRIMS). From the autocorrelation trace we extract a coherence time of 8 ± 2 fs and a mean pulse duration of 28 ± 5 fs, much shorter than estimations based on electron bunch-length measurements. Simulations within the partial coherence model [Opt. Lett. 35, 3441 (2010)] are in agreement with experiment if a pulse-front tilt across the FEL beam diameter is taken into account that leads to a temporal shift of about 6 fs between both pulse replicas.

Second-order autocorrelation of XUV FEL pulses via time resolved two-photon single ionization of He.

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