Control mechanism of atomic ionization and high-order harmonic generation assisted by attosecond pulses

被引：2
|
作者：
Lee, H. C. [1 ]
Jiang, T. F. [1 ]
机构：
[1] Natl Chiao Tung Univ, Inst Phys, Hsinchu 30010, Taiwan
来源：
APPLIED PHYSICS B-LASERS AND OPTICS | 2012年 / 109卷 / 04期
关键词：
STRONG-FIELD APPROXIMATION; LASER FIELDS; S-MATRIX; PHOTOIONIZATION;
D O I：
10.1007/s00340-012-5229-9
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Attosecond pulses combined with infrared laser constitute a powerful tool for controlling atomic photoionization and high-order harmonic generation (HHG). We apply the intense-field many-body S-matrix theory to solve such two-pulse excitation problems. The theory can give a clear explanation for the oscillation of ionization probability as a function of time delay between infrared field and attosecond pulses with central frequency lying below ionization threshold at moderate infrared intensities. The HHG assisted by such attosecond pulses is also interpreted. In addition to a known dramatic enhancement of HHG, a harmonic emission from rapid oscillation of bound-state population caused by the counter-rotating wave is presented.
引用
收藏
页码：621 / 630
页数：10
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