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利用超短紫外光源增强阿秒脉冲的强度
冯立强*,刘航*
作者单位E-mail
冯立强* 辽宁工业大学理学院锦州 121001 中国科学院大连化学物理研究所分子反应动力学国家重点实验室大连 116023 lqfeng_lngy@126.com 
刘航* 辽宁工业大学 化学与环境工程学院锦州 121001 liuhang20@126.com 
摘要:
提出了一种利用超短紫外光源来增强阿秒脉冲强度的方法. 计算结果表明,当适当的加入一束125 nm光源到双色正交激光场时,不仅高次谐波的强度比原双色场时增强了2个数量级,而且选择单一的量子路径对谐波发射起作用,进而形成了一个152 eV的超长平台区. 随后通过激光参数的优化,发现激光脉宽和偏振角对于谐波强度的增强不太敏感. 最后,通过叠加谐波可获得脉宽仅为38 as 的孤立阿秒脉冲,其强度比原双色场情况下产生的阿秒脉冲增强了2个数量级.
关键词:  高次谐波,孤立脉冲,双色正交场,紫外光源
DOI:10.1063/1674-0068/28/cjcp1410171
分类号:
基金项目:
Ultraviolet Source Assisted Enhancement of Attosecond Pulse (cited: 2)
Li-qiang Feng*,Hang Liu*
Abstract:
A promising method to improve the attosecond pulse intensity has been theoretically presented by properly adding an ultraviolet pulse into the orthogonal two-color field. The results show that by properly adding a 125 nm ultraviolet pulse to the orthogonal two-color field, not only the harmonic yield is enhanced by 2 orders of magnitude compared with the original orthogonal two-color field case, but also the single short quantum path, which is selected to contribute to the harmonic spectrum, results in an ultrabroad 152 eV bandwidth. Moreover, by optimizing the laser parameters, we find that the harmonic enhancement is not very sensitive to the pulse duration and the polarized angle of the assisted ultraviolet pulse, which is much better for experimental realization. As a result, an isolated pulse with duration of 38 as can be obtained, which is 2 orders of magnitude improvement in comparison with the original two-color orthogonal field case.
Key words:  High-order harmonic generation, Isolated pulse, Two-color orthogonal field, Ultraviolet source