Spectral self-action of THz emission from ionizing two-color laser pulses in gases

Abstract

The spectrum of terahertz (THz) emission in gases via ionizing two-color femtosecond pulses is analyzed by means of a semi-analytic model and finite-difference-time-domain simulations in 1D and 2D geometries. We show that produced THz signals interact with free electron trajectories and thus influence significantly further THz generation upon propagation, i.e., make the process inherently nonlocal. This self-action plays a key role in the observed strong spectral broadening of the generated THz field. Diffraction limits the achievable THz bandwidth by efficiently depleting the low frequency amplitudes in the propagating field.

arXiv comment12 pages, 6 figures

References in corpus (4)

• Ultrashort filaments of light in weakly-ionized, optically-transparent media
• Tailoring THz radiation by controlling tunnel photoionization events in gases
• Waveform-Controlled Terahertz Radiation from the Air Filament Produced by Few-Cycle Laser Pulses
• Generation of terahertz radiation from ionizing two-color laser pulses in Ar filled metallic hollow waveguides

Cited by in corpus (5)

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• Theory of terahertz emission from femtosecond-laser-induced micro-plasmas
• Terahertz vortex wave generation in air plasma by two-color femtosecond laser pulses
• Terahertz emission from laser-driven gas-plasmas: a plasmonic point of view