Emission of Terahertz Waves from Curved Two-Color Filaments Produced by 2D Airy Wave Packets

Two-color laser filamentation constitute one of the most convenient and efficient sources of pulsed ultra-broadband terahertz (THz) radiation. In this approach, a Gaussian ultrashort laser pulse together with its second harmonic are focused into a gas medium, forming a filament, which emits THz radiation with extremely high THz electric and magnetic fields [1] . A major advantage of two-color filamentation is that one can tune the emitted THz radiation in terms of energy, spectrum, polarization and THz beam divergence by properly tailoring the filament itself [2] , [3] . One way to achieve this tailoring is with the use of robust exotic-wavepackets from the family of accelerating beams such as the ring-Airy and the 2D Airy beams. Two-color plasma channels induced by pre-engineered abruptly autofocusing ring-Airy beams have already been proposed in order to enhance the THz yield by 5.3 times compared to a Gaussian-beam-induced plasma [4] .