Abstract-Ultrabroad terahertz spectrum generation from an air-based filament plasma

V. A. Andreeva, O. G. Kosareva, N. A. Panov, D. E. Shipilo, P. M. Solyankin, M. N. Esaulkov, P. González de Alaiza Martinez, A. P. Shkurinov, V. A. Makarov, L. Bergé, and S. L. Chin

https://journals.aps.org/prl/accepted/4507aYb8Wf411d4d98f601634b2a9b1dd8b3ddd05

We have solved the long standing problem of the mechanism of terahertz (THz) generation by a two-color filament in air and found that both neutrals and plasma contribute to the radiation. We reveal that contribution from neutrals by four-wave mixing is much weaker and higher in frequency than the distinctive plasma lower frequency contribution. The former is in the forward direction while the latter is in a cone and reveals an abrupt downshift towards near the plasma frequency. Ringshaped spatial distributions of the THz radiation are shown to be of universal nature and they occur in both collimated and focusing propagation geometries. Experimental measurements of the frequency-angular spectrum generated by 130-fs laser pulses agree with numerical simulations based on a unidirectional pulse propagation model.

Abstract-Transformation of terahertz spectra emitted from dual-frequency femtosecond pulse interaction in gases

                   

                                                      

A. V. Borodin, N. A. Panov, O. G. Kosareva, V. A. Andreeva, M. N. Esaulkov, V. A. Makarov, A. P. Shkurinov, S. L. Chin, and X.-C. Zhang  »View Author Affiliations

http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-38-11-1906

We demonstrate that the two basic physical mechanisms of terahertz (THz) generation in a femtosecond filament, namely, the free electron photocurrent and the nonlinear polarization of neutrals, can be identified through the spectral analysis of THz radiation. The contribution from the photocurrent peaks at the units of THz, while the neutrals yield the peak at the tens of THz. We suggest the practical implementation of such spectral analysis by varying the initial transform-limited laser pulse duration.

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