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COHERENT NON-LINEARITIES IN A MAGNETO-IONIC MEDIUM
CHALMERS UNIV OF TECHNOLOGY GOETEBORG (SWEDEN)
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When very intense electromagnetic radiation passes through a magneto-ionic medium, two different kinds of non-linearities occur. One is an average change in the medium due to increase electron temperature. The other is an instantaneous change in the local portion of the medium due to increased field-induced electron velocities. The former non-linearity is averaged, in both space and time, in its effect on the radiation. The latter non-linearity is coherent, in both space and time, in its effect on the radiation, and represents a direct back reaction of the medium to the excessive coherent electron velocities as caused by the intensity of the radiation. The coherent non-linearity is finite for continuous wave radiation even when the average effects are small. It is also possible to have short time pulses of radiation that cause severe coherent non-linearities without giving time to allow the electrons to collide enough to change the electron temperature. Author
APPROVED FOR PUBLIC RELEASE