POPULATION DYNAMICS OF GROUND STATE SUBLEVELS: INFLUENCE ON POLARIZATION PROPERTIES OF HIGH HARMONICSстатья
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Аннотация:Within the framework of the non-perturbative light{atom interaction theory, we consider the population
dynamics of the ground-state sublevels corresponding to the dierent values of the orbital quantum
number (l) projections and its in
uence on the high optical harmonics. We study the problem of high
optical harmonics generation in two geometries: (1) two linearly polarized elds at frequencies ! and
2! for dierent angles of azimuthal projection dierence and arbitrary orientation with respect to the
angular momentum of the atom direction; (2) two elliptically polarized elds at frequencies ! and 2!
rotating in opposite directions with variable mutual ellipticity. We show that the unequal population
dynamics of the levels with dierent projections of the atom angular momentum (magnetic quantum
number) has a signicant impact on the value of the ellipticity of the generated radiation.