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通过数值模拟三维传播方程研究了双色场阿秒电离门技术调控产生高次谐波的传播特性.发现波长800和400nm的5fs双色场电离门调控产生的谐波在传播0.5mm后由于短轨道满足相位匹配条件,实现了短轨道的选择,在平台区得到了高效率、无调制的宽带超连续谱(谱宽达80eV).模拟不同传播距离的结果表明该连续谱能够在介质中稳定存在.对该连续谱中60—90eV的谐波直接进行滤波可以得到高效率、脉冲宽度约为135as的单脉冲.这种性质对实验上实现利用阿秒电离门调控产生高效率宽谱单阿秒非常有利.
The numerical simulation of three-dimensional propagation equation was used to study the propagation characteristics of higher order harmonics generated by the two-color field Alsegated ionization gate technique. It was found that the harmonics generated by the 5fs double-color field ionization gate at 800 and 400 nm wavelength were 0.5mm Phase matching conditions, the short orbit is selected and a high efficiency, unmodulated broadband supercontinuum (spectral width 80eV) is obtained in the plateau region.The simulation of different propagation distances shows that the continuum can exist stably in the medium. Direct filtering of the 60-90 eV harmonics in this continuum results in a single pulse with high efficiency and a pulse width of about 135as. This property is experimentally achieved using an AES-based ionization gate to generate high efficiency wide-spectrum single- favorable.