Ionization-free resonantly enhanced low-order harmonic generation in a dense gas mixture by a mid-IR laser field

Migal, E.A.; Stremoukhov, S.Y.; Potemkin, F.V.

Авторы: Migal E.A., Stremoukhov S.Yu, Potemkin F.V.
Журнал: Physical Review A - Atomic, Molecular, and Optical Physics
Том: 101
Год издания: 2020
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 021401-1
Последняя страница: 021401-4
DOI: 10.1103/PhysRevA.101.021401
Аннотация: Recent advances in the development of powerful transition-metal-doped chalcogenide femtosecond lasers made it possible to produce laser radiation directly in the vicinity of molecular vibrational resonances. Here we demonstrate the use of such light for low-order harmonic generation in a dense gas mixture, containing carbon dioxide molecules resonantly interacting with pump radiation. We report on the manifold increase of third (25) and fifth (10) harmonic generation efficiency and the appearance of subsequent harmonics (from 7th to 11th) in xenon (48 bars) in the presence of carbon dioxide (1 bar). Final conversion efficiency obtained experimentally and confirmed numerically reaches 1% for third harmonic and 0.3% for higher ones (from 5th to 11th in total) under a very moderate vacuum intensity of 1.8 × 10^13 W/cm^2. These experiments open new perspectives for optimization of harmonic generation efficiency without significant perturbation of the media. In particular, phase-matching conditions may be also found in extreme ultraviolet and soft x-ray regions, where conversion efficiency from a mid-IR pump stays quite low.
Добавил в систему: Потёмкин Фёдор Викторович

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Ionization-free resonantly enhanced low-order harmonic generation in a dense gas mixture by a mid-IR laser fieldстатья

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