Wavelength scaling of terahertz generation by gas ionization

Clerici, M. et al. (2013) Wavelength scaling of terahertz generation by gas ionization. Physical Review Letters, 110, 253901. (doi: 10.1103/PhysRevLett.110.253901) (PMID:23829737)

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Low-frequency currents induced by ultrashort laser-driven ionization can emit extremely broadband, single-cycle terahertz pulses. We present a model that predicts a strong wavelength dependence of the THz emission in good agreement with our experimental study. This reveals that the combined effects of plasma currents rising proportionally to the square of the pump wavelength and wavelength-dependent focusing conditions lead to 30 times higher THz emission at 1800 nm compared to an 800 nm wavelength. Unrivaled single-cycle electric field strengths of 4.4  MV/cm are achieved with this compact table-top setup.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Clerici, Professor Matteo and Faccio, Professor Daniele
Authors: Clerici, M., Peccianti, M., Schmidt, B. E., Caspani, L., Shalaby, M., Giguère, M., Lotti, A., Couairon, A., Légaré, F., Ozaki, T., Faccio, D., and Morandotti, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114

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