High-order harmonic generation in ion- and nanoparticle-containing aluminum laser-induced plasma
Ochiq kirish: yoʻq
Annotatsiya
The comprehensive study of harmonics generation in aluminum plasma using different methods of harmonic enhancement is presented. The ablation of the surface of an aluminum target using picosecond and nanosecond pulses for the high-order harmonic generation (HHG) during the propagation of 800 nm femtosecond pulses through the laser-induced plasma (LIP) is analyzed at different fluences of the heating pulses. The dynamics of spectral emission of Al plasma in the visible and extreme ultraviolet ranges, spreading of the cloud of evaporated species, influence of the delay between heating and driving pulses on harmonic generation efficiency, two-color pump of optimally formed plasma, comparison of ion- and nanoparticle-contained Al plasmas, and application of narrow and extended plasmas during HHG in different spectral ranges are reported. The analysis of the spectral and spatial characteristics of Al LIP allowed optimizing the HHG conversion efficiency. The comparison of LIPs containing atomic–ionic Al and nanoparticle Al showed the extended harmonic cutoff in the former case and enhanced low-order harmonics in the latter case. The HHG in extended plasma resulted in the growth of conversion efficiency of the lower-order harmonics compared to the narrow LIP.
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