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Nonlinear laser spectropolarimetry of atomic degenerated systems with lower metastable state during optical pumping in intense laser fields

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.