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High-order harmonics and supercontinua formed by a weak optical pump in the presence of an extreme terahertz fieldстатья Исследовательская статья
- Авторы: Babushkin I., Demircan A., Morgner U., Savelev A.
- Журнал: Physical Review A - Atomic, Molecular, and Optical Physics
- Том: 106
- Номер: 1
- Год издания: 2022
- Издательство: American Physical Society
- Местоположение издательства: United States
- Номер статьи: 013115
- DOI: 10.1103/physreva.106.013115
- Аннотация: We show that in the presence of an extreme terahertz (THz) field an additional weak field in the optical frequency range can modulate ionization probability and thereby generate high-order harmonics. The extreme THz pump suppresses recollisions, thereby also fully suppressing the recollision-based harmonics. Nevertheless, high-order harmonics are effectively generated via an alternative mechanism, the so-called Brunel mechanism, based on ionization and subsequent acceleration in the driving field (but not on reabsorption). Using ab initio simulations for the hydrogen atom and short few-cycle optical driver, we show the appearance of a coherent carrier-envelope-phase-insensitive supercontinuum formed by such harmonics, compressible into an isolated pulse with 100-attosecond-scale duration
- Добавил в систему: Савельев-Трофимов Андрей Борисович