Optimum chirp for efficient terahertz generation from two-color femtosecond pulses in air

Zhen Zhang, N. Panov, Vera Andreeva, Zhelin Zhang, A. Slepkov, D. Shipilo, M. D. Thomson, Tie Jun Wang, I. Babushkin, A. Demircan, U. Morgner, Yanping Chen, O. Kosareva, A. Savel'Ev

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10 Scopus citations

Abstract

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 2ω-pulse preserve the overlap with the ω-pulse. The THz yield is extremely sensitive to the temporal overlap: for a 35-fs ω-pulse, the yield decreases by an order of magnitude upon a ω-2ω pulse shift of only 5 fs.

Original languageEnglish (US)
Article number241103
JournalApplied Physics Letters
Volume113
Issue number24
DOIs
StatePublished - Dec 10 2018

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