ИСТИНА

We present a theoretical interpretation of the recent experimental results presented in [G. Lambert et al, Nat. Comm., 6:6167, (2015)], showing that highly elliptical harmonics can be generated in two-color orthogonally polarized laser field. We use the non-perturbative theory of the high order harmonic generation, which takes into account all possible sublevels of atomic states with given angular momentum. The results of numerical calculations, which are in good agreement with the experimental data, demonstrate undoubtedly that the high ellipticity harmonics do exist in the generated spectra. The possibility of generation of randomly polarized radiation is discussed. Кeywords: high harmonics, ellipticity, two-color laser field