Gas-plasma strings from 2-color femtosecond laser filaments constitute one of the most convenient and promising sources of pulsed terahertz (THz) radiation. It is one of the approaches that allow one to achieve at the same time ultrabroadband THz spectra and very high amplitudes of THz electric fields. Such sources present major advantages for applications of sensing, spectroscopy, imaging, and nonlinear optics. In view of the numerous applications an understanding of the spatial distribution of the terahertz radiation, from this source, is crucial. One of the first works towards this direction , revealed a highly directional THz radiation while a more recent publication  proposes a donut-shape spatial pattern. The most recent results reported by Kim et.al. , propose an off-axis phase matched emission from the filament due to interference effect between the different point sources across the filament, resulting thus in a donut-shape profile. A simple theoretical model was also proposed in , which is though insufficient to explain all observations.
|Publication status||Published - 1 Jan 2013|
|Event||2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 - Munich, Germany|
Duration: 12 May 2013 → 16 May 2013
|Other||2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013|
|Period||12/5/13 → 16/5/13|
ASJC Scopus subject areas
- Electrical and Electronic Engineering