| 利用两束同色激光场和半周期脉冲驱动原子产生单个阿秒脉冲 |
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| 引用本文： | 潘慧玲,李鹏程,周效信.利用两束同色激光场和半周期脉冲驱动原子产生单个阿秒脉冲[J].物理学报,2011,60(4):43203-043203. |
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| 作者姓名： | 潘慧玲 李鹏程 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:11044007,11047016),高等学校博士学科点专项科研基金(批准号:20096203110001),西北师范大学创新项目(批准号:NWNU-KJCXGC-03-62)资助的课题. |
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| 摘 要： | 利用分裂算符方法数值求解一维氦原子的含时薛定谔方程,研究了氦原子在两束同色激光场与半周期脉冲(Hcps)形成的组合场驱动下所发射高次谐波的特点.研究结果表明,氦原子在这种组合场驱动下,高次谐波谱的平台区域能得到很大的扩展,其截止位置可延伸到IP+9.6UP,通过构造截止位置附近的高次谐波谱能够得到脉宽为63 as的单个阿秒脉冲.经过分析后发现,半周期脉冲的加入不仅使高次谐波谱平台能够得到扩展,同时还抑制了电子长路径对高次谐波的贡献.
关键词：
两束同色激光场
半周期脉冲
高次谐波
阿秒脉冲
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| 关 键 词： | 两束同色激光场 半周期脉冲 高次谐波 阿秒脉冲 |
| 收稿时间： | 5/6/2010 12:00:00 AM |
Single attosecond pulse generated by atom exposed to two laser pulses with the same color and half cycle pulses |
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| Pan Hui-Ling,Li Peng-Cheng,Zhou Xiao-Xin.Single attosecond pulse generated by atom exposed to two laser pulses with the same color and half cycle pulses[J].Acta Physica Sinica,2011,60(4):43203-043203. |
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| Authors: | Pan Hui-Ling Li Peng-Cheng 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: | By solving numerically the time-dependent Schrödinger equation with the split-operator method, we investigate the characteristic of the high-order harmonic of one-dimensional helium atom exposed to two laser pulses with the same color and half cycle pulses. It is shown that the harmonic spectrum is extended to Ip+9.6Up in the case of the combined fields, and an isolated 63 as pulse can be obtained by superposing the high-order harmonic spectra generated around the cut-off position. An analysis shows that the plateau of the high-order harmonic spectrum is extended greatly and the contribution of the long electron trajectory is suppressed by adding the half cycle pulses. |
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| Keywords: | two laser pulses with the same color half cycle pulses high-order harmonic attosecond pulse |
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