Controlling continuum wavepacket interference by two-color laser field in over-the-barrier ionization regime

Controlling continuum wavepacket interference by two-color laser field in over-the-barrier ionization regime
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跨势垒电离区中双色激光场控制连续波包干涉

DOI:
10.1007/s11467-015-0523-8
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发表时间:
2016-02
影响因子:
7.5
通讯作者:
Ding Da-Jun
Ding Da-Jun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhou Sheng-Peng;Yang Yu-Jun;Ding Da-Jun

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通过数值求解氢原子与激光场相互作用的含时薛定谔方程,研究了连续波包干涉。所得到的波包演化表明,在势垒外电离区(10 ~(16)W/cm ~ 2),电离电子的连续-连续(CC)干涉成为高次谐波产生的主要过程,而Kohleret等报道的连续束缚(CB)跃迁则相反。105(20),203902(2010)]。我们提出了一种双色激光场方案,用于控制电离电子的量子轨道和扩展CC谐波能量。结果,高能量平台出现在HHG光谱中,其完全源自CC谐波,具有可通过双色场的相对相位调节的截止。这为进一步了解原子和分子在超强激光场中的动力学特性提供了可能,也为原子或分子势的成像提供了可能。
Continuum wavepacket interference is investigated by numerically solving the time-dependent Schrödinger equation for the interaction of hydrogen atoms with laser fields. The obtained wavepacket evolution indicates that, in the over-the-barrier ionization regime (1016W/cm2), the continuum–continuum (CC) interference of ionizing electrons becomes the main process in highorder harmonics generation (HHG), compared with continuum-bound (CB) transition, as reported by Kohleret al. [Phys. Rev. Lett. 105(20), 203902 (2010)].We propose a two-color laser field scheme for controlling the quantum trajectories of ionizing electrons and for extending the CC harmonic energy. As a result, a high energy platform occurs in the HHG spectrum, which entirely originates from the CC harmonics, with a cutoff adjustable by the relative phase of the two-color fields. This provides further understanding of the dynamic feature of atoms and molecules in super intense laser fields and provides an opportunity to image the atomic or molecular potential.
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