Author Affiliations
Abstract
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
作者单位
摘要
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
光与物质之间的相互作用是自然界中最基本的物质相互作用之一,这种动力学的完全可视化需要时间上的阿秒分辨率和空间上的原子级分辨率。超短相干电子源是实现这一目标的重要方法。本文介绍了利用各种光场如射频、太赫兹、可见光来产生、相空间调控甚至表征这种超短相干的高品质电子源的重要进展,并主要总结了其在四维超快电子显微镜方面的技术突破,为“阿秒显微镜”的建立开辟了道路,使对电子运动成像成为可能,最后对超快电子研究的发展进行了展望。
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 
光子学报
2021, 50(8): 0850202
Author Affiliations
Abstract
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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