Measurement of the angular distributions of high-order harmonic generations from aligned CO2

In this study, the angular distributions of harmonics emission from aligned CO2 are explored experimentally and theoretically, and the validity of Strong Field Approximation (SFA) model in the molecular high harmonic generation is therefore studied. The study shows that for describing the angle distribution of high harmonic generation from molecules, SFA is roughly consistent with the qualitative analysis, while the quantitative analysis is different.