The generation of ultrashort attosecond pulse requires both an enhanced high harmonic generation and the spectral-phase control. In the present work, an efficient method is theoretically investigated for extending HHG cutoff energy in Br₂ molecule using TDDFT. The effects of molecular orientation and carrier-envelope phase of the laser on the high harmonic spectrum are analyzed. As a result, by the fine modulations of the laser field, the harmonic plateau is enlarged and the position of structure-induced interference minimum shifts. We also provide a physical picture on the intensity dependence of the spectral minima in the harmonic spectra.

中文翻译：

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通过控制载流子包络相位和驱动激光脉冲的偏振来高效生成溴分子高谐波

超短阿秒脉冲的产生既需要增强的高次谐波产生，又需要频谱相位控制。在目前的工作中，理论上研究了使用TDDFT扩展Br ₂分子中HHG截​​止能的有效方法。分析了激光的分子取向和载流子包络相对高次谐波谱的影响。结果，通过激光场的精细调制，谐波平台被扩大，并且结构引起的干涉的位置最小移动。我们还提供了有关谐波频谱中频谱最小值的强度依赖性的物理图片。