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arXiv · 2509.03705

Cavity-Controlled High Harmonic Generation

Zohar Amitay·Nimrod Moiseyev
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Abstract

Employing non-Hermitian Floquet theory, the strong-field process of high harmonic (HH) generation by a classical continuous-wave field irradiating ground-state atom is discovered to be controllable by placing the irradiated atom inside a single-mode quantum cavity initiated even with a single photon. Judicious cavity coupling of cavity-free photo-induced atomic Floquet states forms polaritonic Floquet states that generate side harmonics around the (standard no-cavity) odd harmonics. The different possible cavity-controlled HH spectra, including also the ones resulting from several cavities in a row, enable attosecond-pulse sequences different from the one produced without a cavity. Moreover, the present study sets the framework and opens the way for further cavity control over the HH generation process as well as over other strong-field processes

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Zohar Amitay, Nimrod Moiseyev. 2025-09-03. Cavity-Controlled High Harmonic Generation. https://arxiv.org/abs/2509.03705

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