| 利用两束同色激光场与中红外场形成的组合场驱动氦原子产生单个阿秒脉冲 |
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| 引用本文： | 潘慧玲,王国利,周效信. 利用两束同色激光场与中红外场形成的组合场驱动氦原子产生单个阿秒脉冲[J]. 科学通报, 2011, 56(31): 2561-2566. DOI: 10.1360/972011-524 |
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| 作者姓名： | 潘慧玲 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; |
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| 基金项目： | 国家自然科学基金(11044007,11064013); 高等学校博士学科点专项科研基金(20096203110001); 西北师范大学创新项目(NWNU-KJCXGC-03-62)资助 |
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| 摘 要： | 提出了使用两束同色激光场与中红外场形成的组合场驱动一维氦原子产生单个阿秒脉冲的方法. 通过数值模拟研究了氦原子在组合场驱动下发射高次谐波的特点, 谐波谱的截止位置可以拓展到Ip+12.6Up, 对第二平台区域不同范围内高次谐波叠加均能得到单个阿秒脉冲, 最短脉宽达42 as, 尤其是对平台区域的前端进行叠加, 不仅可以得到单个阿秒脉冲,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. 经过经典和小波分析发现, 中红外场的加入不仅使高次谐波谱平台区域得到了扩展, 同时还抑制了电子长路径对高次谐波的贡献.
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| 关 键 词： | 两束同色激光场 中红外场 高次谐波 阿秒脉冲 |
| 收稿时间： | 2011-05-30 |
Single attosecond pulse generated by helium atom exposed to the combined field of two laser pulses with the same color and midinfrared intense laser pulse |
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| PAN HuiLing,WANG GuoLi , ZHOU XiaoXin Key Laboratory of Atomic , Molecular Physics , Functional Materials of Gansu Province,College of Physics , Electronic Engineering,Northwest Normal University,Lanzhou ,China. Single attosecond pulse generated by helium atom exposed to the combined field of two laser pulses with the same color and midinfrared intense laser pulse[J]. Chinese Science Bulletin, 2011, 56(31): 2561-2566. DOI: 10.1360/972011-524 |
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| Authors: | PAN HuiLing WANG GuoLi & ZHOU XiaoXin Key Laboratory of Atomic Molecular Physics & Functional Materials of Gansu Province College of Physics Electronic Engineering Northwest Normal University Lanzhou China |
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| Affiliation: | PAN HuiLing,WANG GuoLi & ZHOU XiaoXin Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province,College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China |
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| Abstract: | We propose a method to generate single attosecond pulse when one-dimensional helium atom is exposed to the combination of two laser pulses with the same color and a midinfrared laser pulse.We investigate the characteristic of the high-order harmonic by numerical simulation.It is shown that the cut-off position of the harmonic spectrum is extended to Ip +12.6Up.By superimposing some orders harmonics on different region for the second plateau,all of the pulses obtained are single attosecond ones.Minimum pulse... |
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| Keywords: | two laser pulses with the same color midinfrared laser pulse high-order harmonics attosecond pulse |
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