Matteo Clerici1,2,*, Marco Peccianti3,1, Bruno E. Schmidt1, Lucia Caspani1, Mostafa Shalaby1, Mathieu Giguère1,Antonio Lotti4,5, Arnaud Couairon5, François Légaré1, Tsuneyuki Ozaki1, Daniele Faccio2,†, and Roberto Morandotti1
1INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes, Québec J3X 1S2, Canada
2School of Engineering and Physical Sciences, Heriot-Watt University, SUPA, Edinburgh EH14 4AS, United Kingdom
3Institute for Complex Systems (ISC), CNR, via dei Taurini 19, 00185 Rome, Italy
4Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria, via Valleggio 11, 22100 Como, Italy
5Centre de Physique Théorique CNRS, École Polytechnique, F-91128 Palaiseau, France
http://prl.aps.org/abstract/PRL/v110/i25/e253901
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.
© 2013 American Physical Society
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