Speaker
Description
Isolated attosecond pulses are essential tools used in the time-resolved studies of some of the fastest electronic processes in atoms, molecules and solids. These pulses are synthesized from high-order harmonics generated in inert gases by intense, femtosecond laser pulses. During this process an attosecond pulse is generated in every half-cycle of the laser pulse, thus forming an attosecond pulse train. A possible way to isolate a single pulse from this pulse train is the lighthouse technique. This relies on the generation of a laser pulse with rotating wavefront, producing multiple isolated attosecond pulses which propagate in different directions. These pulses become spatially separated in the far field if their divergence is smaller than the difference between their propagation angles. we show that the nonlinear propagation of the laser pulse through the generating gas medium can enhance the angular separation of the generated attosecond pulses through dynamic wavefront rotation.
