Optimum chirp for efficient terahertz generation from two-color femtosecond pulses in airстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 13 января 2019 г.
Аннотация:We compare detailed spatio-temporal propagation simulations with experiments on generation of terahertz (THz) pulses in single filaments with two-color optical excitation, which elucidates the mechanism whereby positively chirped optical pulses lead to the maximum THz yield. The long-wavelength components in the leading edge of the positively chirped 2w-pulse preserve the overlap with the w-pulse. The THz yield is extremely sensitive to the temporal overlap: for a 35-fs w-pulse, the yield decreases by an order of magnitude upon a w–2w pulse shift of only 5 fs.