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arXiv · 2007.15450

Suppression of individual peaks in two-colour high harmonic generation

Sambit Mitra·Shubhadeep Biswas·Johannes Schötz·Emilio Pisanty·Benjamin Förg·Gautam Aditya Kavuri·Christian Burger·William Okell·Maximilian Högner·Ioachim Pupeza·Vladimir Pervak·Maciej Lewenstein·Pawel Wnuk·Matthias F Kling
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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 ($ω$-$2ω$) 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.

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Sambit Mitra, Shubhadeep Biswas, Johannes Schötz, Emilio Pisanty, Benjamin Förg, Gautam Aditya Kavuri, Christian Burger, William Okell, Maximilian Högner, Ioachim Pupeza, Vladimir Pervak, Maciej Lewenstein, Pawel Wnuk, Matthias F Kling. 2020-07-30. Suppression of individual peaks in two-colour high harmonic generation. https://doi.org/10.1088/1361-6455%2Fab859c

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