Method to generate directly a broadband isolated attosecond pulse with stable pulse duration and high signal-to-noise ratio
Method to generate directly a broadband isolated attosecond pulse with stable pulse duration and high signal-to-noise ratio
复制标题
DOI：
10.1103/physreva.78.063407
复制
发表时间：
2008-12
影响因子：
2.9
通讯作者：
W. Hong;P. Lu;P. Lan;Qianguang Li;Qingbin Zhang;Zhenyu Yang;Xinbing Wang
中科院分区：
文献类型：
--
作者：
W. Hong;P. Lu;P. Lan;Qianguang Li;Qingbin Zhang;Zhenyu Yang;Xinbing Wang
A method to generate a broadband isolated attosecond pulse with stable pulse duration and high signal-to-noise ratio is proposed. By adopting a few-cycle driving pulse combined with its second-harmonic field of which the polarization angle is $\ensuremath{\pi}∕3$ with respect to the driving pulse, the short path is well selected and a smooth supercontinuum with the bandwidth of about $50\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ is observed, which leads to 100-as single attosecond pulse generation with high signal-to-noise ratio. More surprisingly, the intensity variation of the second-harmonic field can hardly affect the location and the bandwidth of the generated supercontinuum but only slightly reduce its phase-locking degree. For the intensity of the second-harmonic field higher than ${10}^{14}\phantom{\rule{0.3em}{0ex}}\mathrm{W}∕{\mathrm{cm}}^{2}$, a pure isolated attosecond pulse with duration of about 100 as can be generated by directly filtering out a supercontinuum from $85\char21{}125\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, which facilitates the experimental implement of the isolated attosecond pulse generation.
A method to generate a broadband isolated attosecond pulse with stable pulse duration and high signal-to-noise ratio is proposed. By adopting a few-cycle driving pulse combined with its second-harmonic field of which the polarization angle is $\ensuremath{\pi}∕3$ with respect to the driving pulse, the short path is well selected and a smooth supercontinuum with the bandwidth of about $50\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ is observed, which leads to 100-as single attosecond pulse generation with high signal-to-noise ratio. More surprisingly, the intensity variation of the second-harmonic field can hardly affect the location and the bandwidth of the generated supercontinuum but only slightly reduce its phase-locking degree. For the intensity of the second-harmonic field higher than ${10}^{14}\phantom{\rule{0.3em}{0ex}}\mathrm{W}∕{\mathrm{cm}}^{2}$, a pure isolated attosecond pulse with duration of about 100 as can be generated by directly filtering out a supercontinuum from $85\char21{}125\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, which facilitates the experimental implement of the isolated attosecond pulse generation.