Cross-correlation measurements of femtosecond extreme-ultraviolet high-order harmonics
Cross-correlation measurements of femtosecond extreme-ultraviolet high-order harmonics
复制标题
飞秒极紫外高次谐波的互相关测量
DOI：
10.1364/josab.13.000197
复制
发表时间：
1996
影响因子：
1.9
通讯作者：
A. Mysyrowicz
中科院分区：
文献类型：
--
作者：
J. Schins;P. Breger;P. Agostini;R. Constantinescu;H. Muller;A. Bouhal;G. Grillon;A. Antonetti;A. Mysyrowicz
氦原子被钛宝石激光器的基波脉冲（800 nm，150 fs）和21次谐波脉冲（38 nm）电离。所得到的阈值以上电离光谱包括作为互相关函数缩放的峰，其可以通过两个脉冲之间的时间延迟的变化来绘制。利用这种技术，我们进行了第一次测量，据我们所知，高次谐波脉冲的持续时间与亚皮秒分辨率。结果表明持续时间为40 fs。这个持续时间比基本脉冲的持续时间短得多，与现有的模型计算一致。
He atoms have been ionized by a combination of two pulses the fundamental (800 nm, 150 fs) from a Ti:sapphire laser, and its 21st harmonic (38 nm). The resulting above-threshold ionization spectra comprise peaks that scale as the cross-correlation function, which can be mapped out by variation of the time delay between the two pulses. Using this technique, we have carried out the first measurement, to our knowledge, of the duration of high-order harmonic pulses with subpicosecond resolution. The result indicates a duration of 40 fs. This duration is much shorter than the duration of the fundamental pulse, in agreement with existing model calculations.