Absolute phase control of spectra effects in a two-level medium driven by two-color ultrashort laser pulses

Using a ω–3ωω–3ω combination scenario, we investigate the absolute phase control of the spectra effects for ultrashort laser pulses propagating in a two-level medium. It is found that the higher spectral components can be controlled by the absolute phases. In particular, different absolute phase combinations can lead to the buildup or split of the even harmonics.