The form of the saturated absorption resonance for atomic transition J=1-J=1 at arbitrary intensities of a probe light field
is calculated. The influence of the saturation effect of optical transitions by own spontaneous radiation on the form of a
nonlinear resonance is researched. It is revealed, that in case of orthogonal polarizations of strong and probe fields the
increase of the probe field intensity can result in inversion of the shape of a nonlinear resonance. The saturation effect of
optical transitions by own spontaneous radiation increases contrast of the inverted resonance of saturation and narrows
its spectrum. In case of parallel polarizations of optical fields the peak of absorption can arise in the shape of nonlinear
resonance at splitting of the lower atomic state.
We report the results of studying the effect of the resonant light pressure force on the amplitude and frequency properties of the nonlinear susceptibility and well known absorption resonance dip occurring in optical saturation spectroscopy of two level atomic gas. On the basis of numerical solutions of the Liouville and Fokker-Plank equations the behaviour pattern of the velocity distribution function of a two-level atomic gas in relation to the saturation intensity and time of interaction with a strong resonant optical field was obtained. Time course of the velocity distribution function due to the action of spontaneous light pressure force leads to modification of the nonlinear susceptibility, absorption saturation resonant line form and to change of frequency dip relative to the atomic resonant frequency transition. The represented numerical modeling results explained qualitatively a number ofexperimental facts, that could not be explained before.
The results of multiphoton ionization of the Yb atoms in a long atomic beam near the autoionization (AI) level 4f136p26s and determination of the Fano parameters of AI resonance are reported. The possibility of the amplification without inversion producing near the AI Yb atom levels is analyzed.
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