Results from experimental spectropolarimetric researches in sodium vapors on 3s-3p transition and in a neon gas discharge on 1s5-2p2 and 1s5-2p4 transitions are submitted. The technique of the quantitative data reception on limiting sensitivity of measurements atomic systems as ground states, and metastable one's is described. Opportunities of a method in researches of the rarefied streams of molecular nitrogen are analyzed.
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 possibility of application of nonlinear laser polarization spectroscopy for measuring the steady-state population characteristics in degenerated atomic systems with metastable lower state during optical pumping in intense laser fields is considered. It is shown that a combination of polarization spectroscopy of probe field and the Faraday effect allows to measure directly the population differences for "enriched " and "depleted" Zeeman's sub-levels during the process of optical pumping as well as for optically coupled sub-levels of lower and upper states of the transition. The experimental results for the transitions 1s5?2p2 (J=2?J=1) and 1s5?2p4 (J=2?J=2) Ne20 and their comparison are presented.
In the introduced paper the results of theoretical and experimental investigations in a branch of probe-field spectroscopy of degenerated metastable atoms in a laser radiation field of arbitrary intensity with taking into account of its anisotropical excitation and the presence of additional channels of radiant decay of upper level are presented. It is shown that for the degenerated levels which are excited anisotropically the absorption spectrum of the probe field contains, besides resonances caused by occupancy effects, resonances associated with the magnetic coherence and manifested in the form of peaks and dips with substantially different amplitudes and widths. A fundamentally new property of these resonances is that their widths are proportional to the intensity of the orienting field, and the amplitude of the narrowest resonance becomes appreciable when the orienting field is very strong.
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