| 啁啾激光与半周期脉冲形成的组合场驱动原子产生单个阿秒脉冲 |
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| 引用本文： | 李伟,王国利,周效信.啁啾激光与半周期脉冲形成的组合场驱动原子产生单个阿秒脉冲[J].物理学报,2011,60(12):123201-123201. |
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| 作者姓名： | 李伟 王国利 周效信 |
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| 作者单位： | 西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,兰州 730070 |
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| 基金项目： | 国家自然科学基金(批准号:11044007,11064013)、高等学校博士学科点专项科研基金(批准号:20096203110001)和西北师范大学创新基金(批准号:NWNU-KJCXGC-03-62)资助的课题. |
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| 摘 要： | 提出了由波长为800 nm、脉冲宽度为5 fs的啁啾激光与半周期脉冲形成组合场,并利用这种组合场驱动一维模型氦原子获得单个阿秒脉冲. 通过数值求解一维氦原子的含时薛定谔方程,发现氦原子在组合场驱动下高次谐波谱的截止位置可以扩展到Ip+21.6Up. 对第二平台区域不同范围内高次谐波的叠加都能得到单个阿秒脉冲,最短可达37 as,特别是对平台区域的前端进行叠加不仅能够得到较短的单个阿秒脉冲,而且与截止位置附近高次谐波构造的阿秒脉冲相比,强度提高了3个数量级.
关键词：
啁啾激光场
半周期脉冲
高次谐波
阿秒脉冲
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| 关 键 词： | 啁啾激光场 半周期脉冲 高次谐波 阿秒脉冲 |
| 收稿时间： | 2011-01-24 |
Single attosecond pulse generated by model helium atom exposed to the combined field of an intense few-cycle chirped laser pulse and a half cycle pulse |
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| Li Wei,Wang Guo-Li and Zhou Xiao-Xin.Single attosecond pulse generated by model helium atom exposed to the combined field of an intense few-cycle chirped laser pulse and a half cycle pulse[J].Acta Physica Sinica,2011,60(12):123201-123201. |
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| Authors: | Li Wei Wang Guo-Li and Zhou Xiao-Xin |
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| Institution: | Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China |
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| Abstract: | We propose an efficient method to generate an ultrashort attosecond pulse when a model He is exposed to the combination of an intense few-cycle chirped laser pulse and a half cycle pulse. By solving the time-dependent Schrödinger equation numerically, we find that the cut-off energy of the harmonics is extended effectively to Ip+21.6Up. By superimposing some high-order harmonics in different regions for the second plateau, the obtained pulses are all single attosecond ones. Minimum pulse achieves 37 as. Especially, by superimposing the lower order harmonics of the second plateau, one can obtain single attosecond pulse, and also the intensity of the single pulse is three order of magnitude higher than the attosecond pulse obtained near cut-off of harmonics. |
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| Keywords: | intense few-cycle chirped laser half cycle pulses high-order harmonic generation attosecond pulse |
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