Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields
- Release Time:2025-04-30
- Hits:
Date:
2025-04-30Title of Paper:
Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fieldsJournal:
CHINESE PHYSICS BSummary:
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.Co-author:
Zhao, D (Zhao Di)[ 1 ] ; Jiang, CW (Jiang Chen-Wei)[ 1 ] ; Li, FL (Li Fu-Li)[ 1Volume:
24Page Number:
074205Translation or Not:
NoDate of Publication:
2015-07-01