通过增加太赫兹(THz)脉冲，在800纳米激光场中分离出阿秒脉冲

Journal of Atomic and Molecular Sciences Pub Date : 2016-08-01 DOI:10.4208/JAMS.022516.041916A

Hui-Ni Du, Xin-Lei Ge, Yun-Tao Lin, Hui-Ying Zhong, Jing Guo, Xue-Shen Liu

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引用次数: 1

摘要

．在近红外(3-fs, 800 nm)激光脉冲中加入适当相位的太赫兹(THz)控制场，从理论上研究了高次谐波和孤立阿秒脉冲的产生。结果表明，加入太赫兹场后的红外脉冲的高次谐波谱比单一红外脉冲的高次谐波谱更宽、更平滑。通过时频分析和三步模型说明了其潜在的物理机制。我们用ADK模型计算电离率，进一步论证了高次谐波产生的过程。通过叠加适当范围的谐波谱，可以得到一个持续时间为71的孤立阿秒脉冲。

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Isolated attosecond pulse generation in a 800 nmlaser field by adding a terahertz (THz) pulse

. We theoretically study the high-order harmonic and the isolated attosecond pulse generation in the near-infrared (IR) (3-fs, 800 nm) laser pulse by adding a terahertz (THz) controlling ﬁeld with proper phases. It is found that the high-order harmonic spectrum in the IR pulse by adding a terahertz ﬁeld is broader and smoother than that in the single IR pulse. The underlying physical mechanism is illustrated by means of the time-frequency analysis and the three-step model. We calculate the ionization rate by ADK model to further demonstrate the process of high-order harmonic generation. By superposing a proper range of harmonic spectrum, an isolated attosecond pulse with the duration of 71 as is obtained.

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Journal of Atomic and Molecular Sciences PHYSICS, ATOMIC, MOLECULAR & CHEMICAL-

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