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

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

2010-03-09

arxiv.org/abs/1003.1900v1

Physics

Optics

Scientific paper

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.

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