Suppression of individual peaks in two-colour high harmonic generation

This work investigates the suppression of individual harmonics, simultaneously affecting specific even and odd orders in the high-harmonic spectra generated by strongly tailored, two-colour, multi-cycle laser pulses in neon. The resulting spectra are systematically studied as a function of the elect...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2020-07, Vol.53 (13), p.134004
Main Authors: Mitra, S, Biswas, S, Schötz, J, Pisanty, E, Förg, B, Kavuri, G A, Burger, C, Okell, W, Högner, M, Pupeza, I, Pervak, V, Lewenstein, M, Wnuk, P, Kling, M F
Format: Article
Language:English
Subjects:
high-harmonic generation
strong-field approximation
two-colour control
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Summary:This work investigates the suppression of individual harmonics, simultaneously affecting specific even and odd orders in the high-harmonic spectra generated by strongly tailored, two-colour, multi-cycle laser pulses in neon. The resulting spectra are systematically studied as a function of the electric-field shape in a symmetry-broken (ω-2ω) and symmetry-preserved (ω-3ω) configuration. The peak suppression is reproduced by macroscopic strong-field approximation calculations and is found to be unique to symmetry-broken fields (ω-2ω). Additionally, semi-classical calculations further corroborate the observation and reveal their underlying mechanism, where a nontrivial spectral interference between subsequent asymmetric half-cycles is found to be responsible for the suppression.
ISSN:0953-4075
1361-6455
DOI:10.1088/1361-6455/ab859c