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<p>The difference in harmonic intensity distribution during frequency up-conversion of 800&#xa0;nm, 65&#xa0;fs pulses in a few laser-induced plasmas (Li, Ge, Yb, and As) at variable concentrations of ions is demonstrated. At small fluencies of heating pulses that create laser-induced plasmas, the prevailing presence of neutrals leads to a gradual decrease in harmonic yield. The stronger laser ablation caused the appearance of the singly and doubly charged ions, which led to the enhancement of the single harmonic or small group of harmonics in the vicinity of the ionic transitions possessing large oscillator strengths. These resonance-enhanced harmonics become significantly larger than the neighboring harmonics. The peculiarities of this process are analyzed at different fluencies of the ablating pulses.</p>

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Modification of resonance-induced enhancement of high-order harmonics in the laser plasmas containing atoms and ions

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Rashid A. Ganeev

摘要

The difference in harmonic intensity distribution during frequency up-conversion of 800 nm, 65 fs pulses in a few laser-induced plasmas (Li, Ge, Yb, and As) at variable concentrations of ions is demonstrated. At small fluencies of heating pulses that create laser-induced plasmas, the prevailing presence of neutrals leads to a gradual decrease in harmonic yield. The stronger laser ablation caused the appearance of the singly and doubly charged ions, which led to the enhancement of the single harmonic or small group of harmonics in the vicinity of the ionic transitions possessing large oscillator strengths. These resonance-enhanced harmonics become significantly larger than the neighboring harmonics. The peculiarities of this process are analyzed at different fluencies of the ablating pulses.