谐波
高次谐波产生
啁啾声
激光器
阿秒
物理
极端紫外线
谐波频谱
光学
相(物质)
脉搏(音乐)
波形
谱线
超短脉冲
材料科学
量子力学
电压
天文
探测器
作者
Zhiyong Qin,Jiansheng Liu,Jiansheng Liu,Zhijun Zhang,Shi-Yi Zhou,Ziqiang Xu,J. Cai,Xiao-xue Jiao,Zheng Xiang
出处
期刊:Physical review
日期:2023-06-29
卷期号:107 (6)
标识
DOI:10.1103/physreva.107.063109
摘要
We present a theoretical investigation of an efficient method for generating macroscopic high-order harmonics with a smooth broadband continuous spectrum structure driven by a temporal asymmetric laser field. Our study demonstrates that selected continuous high-order harmonic spectra can support isolated attosecond pulses (IAPs) in the extreme ultraviolet region. Time-frequency analysis of high-order harmonics reveals that the smooth broadband continuous spectrum is dominated by long-trajectory electron emissions. The quantitative analysis of the phase mismatching reveals that the generation of the IAP is caused by the favorable transient phase matching of the long-trajectory electron emissions in the macroscopic medium, which can be attributed to the spatiotemporal reshaping of the laser waveform at high gas pressure. Furthermore, we also investigate the dependency of IAP on gas pressure and laser chirp parameters and find that the pulse width of the generated IAPs can be controlled by adjusting the gas pressure and the chirp parameters.
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