Ultrafast spatio-temporal dynamics of terahertz generation by ionizing two-color femtosecond pulses in gases

Abstract

We present a combined theoretical and experimental study of spatio-temporal propagation effects in terahertz (THz) generation in gases using two-color ionizing laser pulses. The observed strong broadening of the THz spectra with increasing gas pressure reveals the prominent role of spatio-temporal reshaping and of a plasma-induced blue-shift of the pump pulses in the generation process. Results obtained from (3+1)-dimensional simulations are in good agreement with experimental findings and clarify the mechanisms responsible for THz emission.

References in corpus (1)

• Determination of the Carrier-Envelope Phase of Few-Cycle Laser Pulses with Terahertz-Emission Spectroscopy

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• Theoretical study of terahertz generation from atoms and aligned molecules driven by two-color laser fields
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• Combined action of the bound-electron nonlinearity and the tunnel-ionization current in low-order harmonic generation in noble gases
• Initial carrier-envelope phase of few-cycle pulses determined by THz emission from air plasma
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