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Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields
- 发表刊物：
- CHINESE PHYSICS B
- 摘要：
- High harmonic generation (HHG) driven by intense frequency-comb laser fields can be dramatically enhanced via multiphoton resonance by tuning the carrier-envelope phase (CEP) shift, without increasing the driving intensity. However, the multiphoton-resonant enhancement (MRE) factor in the realistic atomic hydrogen is much smaller than that in a twolevel system. To study the deviation, we present a theoretical investigation of the multiphoton resonance dynamics of three-level systems driven by intense frequency-comb laser fields. The many-mode Floquet theorem (MMFT) is employed to provide a nonperturbative and exact treatment of the interaction between the quantum system and the laser fields. The investigations show that the dipole interaction of a two-level system with the third level affects the multiphoton resonance dynamics and enhances the HHG spectra. It is the dipole interaction of the excited level of the two-level system with other levels that results in the smaller MRE factor in the realistic atomic system.
- 合写作者：
- Zhao, D (Zhao Di)[ 1 ] ; Jiang, CW (Jiang Chen-Wei)[ 1 ] ; Li, FL (Li Fu-Li)[ 1
- 卷号：
- 24
- 页面范围：
- 074205
- 是否译文：
- 否
- 发表时间：
- 2015-07-01
