2017/04/20 by Guang-Rui Jia, Xiao-Huan Huang, Xue-Bin Bian · 39 citations
Engineering · Physics and Astronomy · #Excitation #Harmonic #Harmonics #High harmonic generation #Laser #Laser Material Processing Techniques #Laser-Matter Interactions and Applications #Laser-Plasma Interactions and Diagnostics #Population #Redshift #Spectral line #physics.optics
paper · pdf · open access · doi:10.1364/oe.25.023654
published in Optics Express 25(20), 23654 (Optica Publishing Group)
arxiv created 2017/04/20 · openalex created_date 2017/05/05 · openalex publication_date 2017/09/18 · arxiv updated 2017/09/20 · openalex updated_date 2026/08/05
We studied the multi-plateau high-order harmonic generation (HHG) from solids numerically. It is found that the HHG spectra in the second and higher plateaus are redshifted in short laser pulses due to the nonadiabatic effect. The corresponding FWHMs also increase as a function of the harmonic order, suggesting the step-by-step excitation of higher conduction bands in the HHG process. Although the system is symmetric in the coordinate space, even-order harmonics are present. It is due to the fact that the symmetry of electron motions and the population in the higher conduction bands is broken in the k space and time domain based on the indirect step-by-step excitation model. Our numerical results are in good agreement with recent experimental measurements of Ndabashimiye et al. [Nature 534, 520 (2016)].