研究目的

Investigating the polarization of high-order harmonic generation in H2+ driven by a counterrotating bichromatic ω/3ω circularly polarized laser field and proposing a scheme to control the harmonic polarization state by the molecular alignment angle.

研究成果

The study concludes that the polarization of high-order harmonic generation can be controlled by the molecular alignment angle, with a critical alignment angle identified where the ellipticity of high-energy harmonics is almost the same. This allows for the synthesis of an attosecond pulse train with a high degree of polarization. The rotation angle of the harmonics is found to be always different from the alignment angle by 90? with a small deflection, providing a method to control harmonic polarization.

研究不足

The study is theoretical and relies on numerical simulations, which may not fully capture all physical phenomena in experimental conditions. The fixed-nuclei approximation may also limit the applicability to real-world scenarios where nuclear motion is significant.