Resolving the polarization of high-order harmonic generation by temporal multislit interferometry

We propose a temporal multislit interference model of high-order harmonic generation (HHG). By using the interference picture, we investigate the polarization features of harmonics generated by atoms and the two-dimensional synthesized driving laser fields. The result shows that the selection rules and ellipticity of harmonics can be understood by intracycle interference. Based on quantum path analysis, we show the harmonic polarization can be controlled by modifying the structure of the temporal interferometer. We perform a quantitative analysis of the harmonic polarization spectrum in terms of electron dynamics and provide an intuitive picture and a general tool for HHG investigation.