Abstract Through controlling the charge resonance enhanced ionization process of the isotope molecules of hydrogen molecular ion, deuterium molecular ion and tritium molecular ion, the intense single harmonic emission event has been produced, which is beneficial to generate the single attosecond pulse. Moreover, the optimal laser parameter combinations for producing the intense harmonic spectra and attosecond pulses have been shown from 4 × 1014 W/cm2 to 7 × 1014 W/cm2. Further, by properly adding a half-cycle unipolar pulse, the selected single harmonic emission event can be further extended, which can support the shorter attosecond pulse with higher photon energy. Finally, by superposing these harmonics, a number of intense attosecond pulses shorter than 40 as can be obtained.

中文翻译：

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氢分子离子及其同位素分子离子在半周期单极脉冲的辅助下产生强单次谐波发射事件和阿秒脉冲

摘要 通过控制氢分子离子、氘分子离子和氚分子离子同位素分子的电荷共振增强电离过程，产生了强烈的单次谐波发射事件，有利于产生单次阿秒脉冲。此外，用于产生强谐波光谱和阿秒脉冲的最佳激光参数组合已显示为 4 × 1014 W/cm2 至 7 × 1014 W/cm2。此外，通过适当添加半周期单极脉冲，可以进一步扩展所选的单次谐波发射事件，从而可以支持较短的阿秒脉冲，具有较高的光子能量。最后，通过叠加这些谐波，可以获得许多短于 40 的强阿秒脉冲。