High-order harmonic generation in argon driven by short laser pulses: effects of post-pulse propagation and windowing

• URL: http://arxiv.org/abs/2604.19957v1
• Date: Tue, 21 Apr 2026 20:09:04 GMT
• Title: High-order harmonic generation in argon driven by short laser pulses: effects of post-pulse propagation and windowing
• Abstract summary: We present ab initio calculations using the $R$-matrix with time dependence (RMT) method for high-order harmonic generation in argon.<n>The calculations employ a $6$-cycle $sin2$ pulse at $850$ nm with peak intensity $2.3times 1014$ W/cm$2$.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present ab initio calculations using the $R$-matrix with time dependence (RMT) method for high-order harmonic generation (HHG) in argon in a short, intense pulse regime. The calculations employ a $6$-cycle $\sin^2$ pulse at $850$ nm with peak intensity $2.3\times 10^{14}$ W/cm$^2$ and, for comparison with the experiment by Guo et al. [J. Phys. B: At. Mol. Opt. Phys. 51, 034006 (2018)], a Gaussian pulse with the same frequency and peak intensity. Both pulse shapes yield the expected harmonic structure in the region above the ionization threshold (approximately $15.82$ eV in $LS$-coupling). The spectra exhibit strong carrier-envelope-phase (CEP) sensitivity. The energy region leading up to the ionization threshold contains spectral features arising from residual coherent dipole oscillations (free-induction decay) that strongly depend on spectral windowing and the post-pulse propagation time. We show that the HHG spectrum, particularly below the ionization threshold, is a defined quantity that depends on analysis choices rather than being a uniquely determined observable. Comparison between theoretical predictions and experimental observations in this energy regime, therefore, requires explicit specification of these parameters.

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