Attosecond manipulation of ionization and efficient broadband supercontinuum generation in stretched molecules

Attosecond manipulation of ionization and efficient broadband supercontinuum generation in stretched molecules
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拉伸分子中电离的阿秒操纵和高效宽带超连续谱产生

DOI:
10.1088/1674-1056/19/8/083203
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发表时间:
2010-08
期刊:
影响因子:
1.7
通讯作者:
Lu Pei-Xiang
Lu Pei-Xiang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Hong Wei-Yi;Zhang Qing-Bin;Li Qian-Guang;Wang Shao-Yi;Lu Pei-Xiang

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本文从理论上研究了线偏振强场中拉伸分子的高次谐波产生。采用红外脉冲与紫外阿秒脉冲相结合的方法,可以有效地控制电离过程。在此激发方案下,IP + 3.17UP之后的谐波谱被显著增强了两个量级,其中IP和UP = e2 E02/(4 me ω2)分别为电离势和有质动力势,从而获得带宽约为120 eV的平滑宽带超连续谱,从而获得了高信噪比的亚60 as的孤立阿秒脉冲。此外,超连续谱的带宽是弱依赖于紫外脉冲的位置和脉冲宽度。
We theoretically investigate the high-order harmonic generation from stretched molecules in a linearly polarized intense field. By adopting an infrared pulse combined with an ultraviolet (UV) attosecond pulse, the ionization process can be controlled effectively. In this excitation scheme, the harmonic spectrum beyond IP + 3.17UP is significantly enhanced by two orders, where IP and UP = e2E02/(4meω2) are the ionization and ponderomotive potential, then smooth broadband supercontinuum with the bandwidth of about 120 eV is obtained, which leads to an isolated sub-60- as attosecond pulse with a high signal-noise ratio. Moreover, the bandwidth of the supercontinuum is weakly dependent on the location and pulse duration of the UV pulse.
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