Generation of elliptical isolated attosecond pulse from oriented H2+ in a linearly polarized laser field

We investigate the ellipticity of the high-order harmonic generation from the oriented H-2(+) exposed to a linearly polarized laser field by numerically solving the two-dimensional time-dependent Schrodinger equation (2D TDSE). Numerical simulations show that the harmonic ellipticity is remarkably sensitive to the alignment angle. The harmonic spectrum is highly elliptically polarized at a specific alignment angle theta = 30 degrees, which is insensitive to the variation of the laser parameters. The position of the harmonic intensity minima indicates the high ellipticity, which can be attributed to the two-center interference effect. The high ellipticity can be explained by the phase difference of the harmonics. This result facilitates the synthesis of a highly elliptical isolated attosecond pulse with duration down to 65 as, which can be served as a powerful tool to explore the ultrafast dynamics of molecules and study chiral light-matter interaction.

Automated summary

In this study, we numerically investigate the ellipticity of the high-order harmonic generation from oriented H2+ exposed to a linearly polarized laser field by solving the 2D TDSE. The numerical simulations reveal that the harmonic ellipticity is highly sensitive to the alignment angle. At a specific alignment angle theta = 30 degrees, the harmonic spectrum is highly elliptically polarized and remains unaffected by variations in the laser parameters. The position of the harmonic intensity minima indicates the high ellipticity, which can be explained by the two-center interference effect. This result is significant for synthesizing highly elliptical isolated attosecond pulses for exploring ultrafast dynamics of molecules and studying chiral light-matter interaction.