Isolated attosecond pulse generation from a model of Ar + cluster in a synthesized two-color laser pulse
Isolated attosecond pulse generation from a model of Ar + cluster in a synthesized two-color laser pulse
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DOI：
10.1103/physreva.85.025802
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发表时间：
2012-02
影响因子：
2.9
通讯作者：
C. Xia;Xin-Lei Ge;Xi Zhao;Jing Guo;Xue-shen Liu
中科院分区：
文献类型：
--
作者：
C. Xia;Xin-Lei Ge;Xi Zhao;Jing Guo;Xue-shen Liu
从理论上研究了在合成双色激光脉冲中，二维Ar+团簇模型的高次谐波产生和孤立阿秒脉冲产生。提出了一种利用4 fs 800 nm基频光和波长可调的弱光脉冲产生孤立阿秒脉冲的方案。当中心原子周围的离子数为24，弱脉冲波长为1200 nm，强度为1 × 1014 W/cm 2时，在高次谐波截止处叠加带宽为100 eV的窄脉冲，获得了脉宽为45 as的近似线偏振的孤立阿秒脉冲.此外，我们说明的路径的干扰效果的高次谐波产生的时频分析。
We theoretically investigate the high-order harmonic generation and isolated attosecond pulse generation from a two-dimensional model of an Ar+ cluster in a synthesized two-color laser pulse. A scheme to generate an isolated attosecond pulse is proposed by using a 4-fs 800-nm fundamental field in combination with a wavelength-adjustable weaker pulse. When the number of ions surrounding the central atom is 24 and the wavelength-adjustable weaker pulse is chosen to be 1200 nm with the intensity 1 × 1014 W/cm2, an almost linearly polarized isolated attosecond pulse with the duration of 45 as is obtained by superposing a bandwidth of 100 eV near the cutoff of high-order harmonic generation. Moreover, we illustrate the interference effect of the paths in terms of the time-frequency analysis of high-order harmonic generation.