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Mitra, S.; Biswas, S.; Schoetz, J.; Pisanty, E.; Foerg, B.; Kavuri, G. A.; Burger, C.; Okell, W.; Hoegner, M.; Pupeza, I.; Pervak, V.; Lewenstein, M.; Wnuk, P.; Kling, M. F. (2020): Suppression of individual peaks in two-colour high harmonic generation. In: Journal of Physics B-Atomic Molecular and Optical Physics, Vol. 53, No. 13, 134004
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Abstract

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 (omega-2 omega) and symmetry-preserved (omega-3 omega) configuration. The peak suppression is reproduced by macroscopic strong-field approximation calculations and is found to be unique to symmetry-broken fields (omega-2 omega). 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.