Generation of an isolated sub-100 attosecond pulse in the water-window spectral region |
| |
Authors: | Zou Pu Li Ru-Xin Zeng Zhi-Nan Xiong Hui Liu Peng Leng Yu-Xin Fan Pin-Zhong and Xu Zhi-Zhan |
| |
Affiliation: | State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China |
| |
Abstract: | We propose a scheme to generate isolated attosecond pulses
in the water-window spectral region. Based on the numerical solutions of
the single active electron model, we investigate high-order harmonic
generation in helium atoms driven by a multi-cycle two-colour
optical field synthesized by an intense 2000 nm, 20 fs pulse and its
frequency-doubled pulse. When the latter is slightly detuned and
properly phase shifted with respect to the fundamental laser pulse,
an ultra-broad extreme ultraviolet supercontinuum with a spectral
width of 130~eV can be generated in the 270--400~eV spectral regions.
A supercontinuum from 280--340~eV in the water window can be
selected to yield an isolated 67 attosecond pulse without employing
any phase compensation. This water window coherent x-ray pulse with
less than 100 attosecond duration is a potential tool for studying
the ultrafast electronic dynamics of biological samples in water. |
| |
Keywords: | x-ray ultraviolet spectra optical harmonic generation |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|