Author Affiliations
1 State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China
2 Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
3 School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China
Relativistic surface high harmonics, combined with the use of polarization gating, present a promising route towards intense single attosecond pulses. However, they impose stringent requirements on ultra-high laser contrast and are restricted by large intensity losses in real experiments. Here, we numerically demonstrate that by setting an optimal time delay in the polarization gating scheme, the intensity of the generated single attosecond pulses can become approximately 100 times stronger than that with nonoptimal time delay in the coherent synchrotron emission process. When a petawatt-class driving laser irradiates a solid target, an ultra-dense electron nanobunch and a strong space-charge sheath develop, and the accumulated electrostatic energy is only released in half of the laser cycle when this electron nanobunch moves backward. This process results in the emission of intense high harmonics. Our study provides a reliable method for developing bright attosecond extreme ultraviolet pulses.
Laser and Particle Beams
2022, 2022(1): 6948110
田野 1,2周楚亮 1,2付学文 3,*纪少政 3[ ... ]李儒新 1,2
1 中国科学院上海光学精密机械研究所 强场激光物理国家重点实验室 超强激光科学卓越创新中心, 上海20800
2 中国科学院大学 材料科学与光电子工程中心,北京100049
3 南开大学 物理学院 超快电子显微镜实验室 弱光非线性光子学教育部重点实验室,天津00071
电子光学 相干电子源 电子光场调控 超短电子脉冲 时间分辨成像与显微 超快电子显微成像 Electron optics Coherent electron sources Optical field control of electron pulses Ultrashort electron pulses Time-resolved image and diffraction Ultrafast electron microscopy 
2021, 50(8): 0850202
Author Affiliations
1 State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser Science, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Ball lightning is widely concerning because it is hard to detect, predict, and reproduce. The dependences of electromagnetic (EM) solitons, which are considered expectant ball lightning, forming at the wavelength of the incident light are investigated with two-dimensional particle-in-cell simulations. It shows that both the long wavelength microwave and the short wavelength laser are not suitable for producing the observed ball-lightning-like EM solitons. A strong field terahertz wave is proposed to inject and generate EM solitons. This paper can provide some references for researchers studying ball lightning.
expectant ball lightning electromagnetic solitons terahertz 
Chinese Optics Letters
2021, 19(8): 083201

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