Speaker
Description
Properly phased two-color laser pulses drive photoionization currents that emit broadband THz radiation. With conventional two-color pulses, the ionization front travels at a nearly constant superluminal velocity, generating THz radiation with conical wavefronts at a Cherenkov-like angle. Here we show that the dynamic intensity peak of a two-color ultrashort flying-focus pulse can be used to control the shape of the THz wavefronts. Simulations demonstrate that non-uniform motion of the intensity peak and the ionization front it drives result in a time-dependent emission angle that determines the wavefront shape. A decelerating intensity peak, in particular, enables the generation of THz radiation with parabolic phase fronts that are well suited for collection and focusing.
| Working group | WG6 |
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