Portal de Periódicos da CAPES

Ellipticity Dependence of High-Order Harmonic Generation from Aligned Molecules

2007; American Physical Society; Volume: 98; Issue: 5 Linguagem: Inglês

10.1103/physrevlett.98.053002

1092-0145

Tsuneto Kanai, Shinichirou Minemoto, Hirofumi Sakai,

Terahertz technology and applications

We report ellipticity dependence of high-order harmonic generation (HHG) from aligned ${\mathrm{N}}_{2}$, ${\mathrm{O}}_{2}$, and ${\mathrm{CO}}_{2}$ molecules. Experimentally, we find that the ellipticity dependence is sensitive to molecular alignment and to the shape and symmetry of the valence orbitals. It is also found that the destructive interference in the recombination process affects the ellipticity dependence. Theoretically, we extend the original Lewenstein model to a more generalized model, which can be applicable to HHG from molecules, by introducing an electron acceleration parameter ${\ensuremath{\xi}}_{\ensuremath{\theta}}$ and by combining the molecular orbital method. The present observations are successfully explained by our model.