Ticking terahertz wave generation in attoseconds

Abstract

We perform a joint measurement of terahertz waves and high-order harmonics generated from noble atoms driven by a fundamental laser pulse and its second harmonic. By correlating their dependence on the phase-delay of the two pulses, we determine the generation of THz waves in tens of attoseconds precision. Compared with simulations and models, we find that the laser-assisted soft-collision of the electron wave packet with the atomic core plays a key role. It is demonstrated that the rescattering process, being indispensable in HHG processes, dominant THz wave generation as well but in a more elaborate way. The new finding might be helpful for the full characterization of the rescattering dynamics.

4 figures

References in corpus (1)

• Electron-energy bunching in laser-driven soft recollisions

Cited by in corpus (6)

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• Theoretical study of terahertz generation from atoms and aligned molecules driven by two-color laser fields
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• Multiband dynamics of extended harmonic generation in solids under ultraviolet injection
• Classical trajectories in polar-asymmetric laser fields: Synchronous THz and XUV emission
• Coulomb potential determining terahertz polarization in two-color laser field