We demonstrate here that mixing of two laser pulses with tailoring the carrier-envelope-phase enables advanced control of both harmonic emission and timing with attosecond precision.
Simulations based on the time-dependent density functional theory (TDDFT) have been performed for crystalline silicon and confirmed in experiments with simultaneous monitoring of the amplitudes and emission delays of high harmonic radiation. The paper demonstrates the high level of prediction capabilities offered by the TDDFT and the importance of accounting for the carrier envelope phase upon mixing bicolor pulses in the case of temporal and spatial overlap. The work was performed in collaboration with Charles University, Prague.
The instantaneous power of high harmonic emission calculated using time-dependent density functional theory (blue shaded area) for two values of the relative phase difference of 𝜑 = 1.5𝜋 and 𝜑 = 0.5. The time evolution of the electric field of the combined waveform (red solid curve) is compared with the electric field of the fundamental pulse (black dashed curve).