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摘要

超短超强激光与固体靶表面等离子体相互作用可以通过高次谐波的方式产生从极紫外到软X射线波段的相干辐射，获得飞秒甚至阿秒量级的超短脉冲，可用于观测原子或分子中的电子运动等超快动力学过程.本文实验研究了相对论圆偏振飞秒激光与固体靶相互作用的高次谐波产生过程，实验结果表明，在较大入射角下，圆偏振激光也可以有效地产生高次谐波辐射.通过预脉冲控制靶表面的预等离子体密度标长，发现高次谐波的产生效率随密度标长的增加而单调下降.进一步通过二维粒子模拟程序，分析了激光的偏振以及预等离子体密度标长对高次谐波产生的影响，很好地解释了实验观测结果.

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Abstract

Coherent extreme ultra-violet (XUV) and soft X-ray light with attosecond duration enable the time-resolved study of electron dynamics in a completely new regime. High order harmonic generation (HHG) from the highly nonlinear process of relativistically intense laser interactions with solid-density plasma offers a very new way to generate such a light source. In this paper, we study the HHG by a relativistically circularly polarized femtosecond laser interacting with solid-density plasma. The experiment is carried out by using a 200 TW Ti:sapphire laser system at the Laboratory for Laser Plasmas in Shanghai Jiao Tong University, China. The laser system can deliver laser pulses at 800 nm with a pulse duration (full width at half maximum, FWHM) of 25 fs and repetition rate of 10 Hz. The circularly polarized laser beam with an energy of 460 mJ is used in the experiment and focused by an F/4 off-axis parabolic mirror at an incidence angle of 40 with respect to the glass target. The focal spot diameter is 6 m (FWHM) with 25% energy enclosed, giving a calculated peak intensity of 1.61019 W/cm2. We detect high order harmonics by a flat-field spectrometer. The experimental results show that high order harmonic radiation can also be efficiently generated by a circularly polarized laser at a lager incidence angle, which provides a straightforward way to obtain a circularly polarized XUV light source. Different plasma density scale lengths are obtained by introducing a prepulse with different delays. We study the dependence of HHG efficiency on plasma density scale length by the circularly polarized laser, and find an optimal density scale length to exist. The influence of laser polarization and plasma density scale length on HHG are studied by two-dimensional (2D) PIC simulations. The good agreement is found between the 2D PIC simulations and experimental results. We plan to measure the polarization characteristics of high order harmonic produced by the interaction of circularly polarized lasers with solid target in the future. It is expected to obtain a compact coherent circularly polarized XUV light source, which can be used to study the ultra-fast dynamic process of magnetic materials.

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作者及机构信息

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通信作者:刘峰,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn; 陈黎明,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn;

基金项目:国家重点基础研究发展计划（批准号：2013CBA01504）、国家自然科学基金（批准号：11721091，11305103，11775144）、上海市自然科学基金（批准号：18ZR1419200，13ZR1456300）和中国博士后科学基金（批准号：2017M621443）资助的课题.

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Corresponding author:Liu Feng^1\2,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn; Chen Li-Ming^1\2\3,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn;

Funds:Project supported by the National Basic Research Program of China (Grant No. 2013CBA01504), the National Natural Science Foundation of China (Grant Nos. 11721091, 11305103, 11775144), the Natural Science Foundation of Shanghai, China (Grant Nos. 18ZR1419200, 13ZR1456300), and the China Postdoctoral Science Foundation (Grant No. 2017M621443).

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施引文献

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High order harmonics generation by relativistically circularly polarized laser-solid interaction

摘要

Abstract

作者及机构信息

1.
2.
3.
4.
5.

通信作者:刘峰,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn; 陈黎明,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn;

Authors and contacts

1.
2.
3.
4.
5.

Corresponding author:Liu Feng^1\2,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn; Chen Li-Ming^1\2\3,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn;

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High order harmonics generation by relativistically circularly polarized laser-solid interaction

摘要

Abstract

作者及机构信息

1.2.3.4.5.

通信作者:刘峰,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn; 陈黎明,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn;

Authors and contacts

1.2.3.4.5.

Corresponding author:Liu Feng1\2,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn; Chen Li-Ming1\2\3,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn;

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Corresponding author:Liu Feng^1\2,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn; Chen Li-Ming^1\2\3,liuf001@sjtu.edu.cn;lmchen@iphy.ac.cn;