中国物理B ›› 2016, Vol. 25 ›› Issue (4): 43202-043202.doi: 10.1088/1674-1056/25/4/043202
• SPECIAL TOPIC—Soft matter and biological physics (Review) • 上一篇 下一篇
Hui Du(杜慧), Jun Zhang(张军), Shuai Ben(贲帅), Hui-Ying Zhong(钟慧英), Tong-Tong Xu(徐彤彤), Jing Guo(郭静), Xue-Shen Liu(刘学深)
Hui Du(杜慧), Jun Zhang(张军), Shuai Ben(贲帅), Hui-Ying Zhong(钟慧英), Tong-Tong Xu(徐彤彤), Jing Guo(郭静), Xue-Shen Liu(刘学深)
摘要:
The generation of high-order harmonics and the attosecond pulse of the N2 molecule in two-color circularly polarized laser fields are investigated by the strong-field Lewenstein model. We show that the plateau of spectra is dramatically extended and a continuous harmonic spectrum with the bandwidth of 113 eV is obtained. When a static field is added to the x direction, the quantum path control is realized and a supercontinuum spectrum can be obtained, which is beneficial to obtain a shorter attosecond pulse. The underlying physical mechanism is well explained by the time-frequency analysis and the semi-classical three-step model with a finite initial transverse velocity. By superposing several orders of harmonics in the combination of two-color circularly polarized laser fields and a static field, an isolated attosecond pulse with a duration of 30 as can be generated.
中图分类号: (Multiphoton ionization and excitation to highly excited states)