21 October 2015 Spatio-spectral characteristics of THz radiation from two-color femtosecond filament
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Spatio-spectral distribution of THz radiation generated by two-color femtosecond laser breakdown in air is investigated theoretically. The theoretical model is based on the fast oscillating light field propagation and self-consistent free electron generation process. We find that the THz emission spectrum has both the low-frequency component related to the transient photocurrent with the maximum spectral intensity at ~1 THz, and the high-frequency component at ~10 THz related to the nonlinear response of bound electrons.
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Vera A. Andreeva, Vera A. Andreeva, Nikolay A. Panov, Nikolay A. Panov, Mikhail N. Esaulkov, Mikhail N. Esaulkov, Olga G. Kosareva, Olga G. Kosareva, Petr M. Solyankin, Petr M. Solyankin, Daniil E. Shipilo, Daniil E. Shipilo, Alexander V. Borodin, Alexander V. Borodin, Vladimir A. Makarov, Vladimir A. Makarov, Alexander P. Shkurinov, Alexander P. Shkurinov, } "Spatio-spectral characteristics of THz radiation from two-color femtosecond filament", Proc. SPIE 9651, Millimetre Wave and Terahertz Sensors and Technology VIII, 96510K (21 October 2015); doi: 10.1117/12.2196801; https://doi.org/10.1117/12.2196801

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