2005, Vol.8, No.4, pp.317-330
The description of evolution of arbitrary polarized
monochromatic plane wave propagating through an assemble of
randomly orientated two-levels molecules is presented. The main
mechanism of nonlinearity is resonant saturation of molecular
upper state population. Using the unified spherical basic tensor
approach that has been formulated earlier (NPCS, 2003, V.5, P.1-14)
the orientation averaging procedure is described in
details. It is shown that the state of wave polarization is a
substantial parameter for the description of wave evolution in
nonlinear resonant media and any attempt to neglect of
polarization effects can lead to incorrect results. The analysis
of polarization stability shows that there are seemingly no state
of polarization that is stable in global sense - stability is a
relative notion and can be realized under certain conditions.
Key words:
polarization, basic spherical tensors, saturation,
polarization stability
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