Modifying angular and polarization selection rules of high-order harmonics by controlling electron trajectories in k-space.

ABSTRACT: Recent advances in generation of strong laser pulses have enabled the acceleration of electrons in solids into regions far away from the band edge. Because nonlinear currents can be generated by laser-driven carriers in the non-parabolic region, tailored laser fields may allow control of optical properties of high-order harmonics (HHs). So far, investigations on laser-induced nonlinear optical phenomena have focused on the simple electron motion induced by linearly or elliptically polarized fields. However, more complex trajectories can be important for development of novel optoelectronic devices. Here, we show that a weak laser field (optical frequency is ω₂) applied in a direction orthogonal to a strong main field (ω₁) enhances certain HH intensity components of bul

SUBMITTER: Sanari Y 

PROVIDER: S-EPMC7299964 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature