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Based on Document (1), by considering the retarded interaction of radiationfields, the third order transition probabilities of stimulated radiations andabsorptions of light are calculated. The revised formulas of nonlinearpolarizations are provided. The results show that that the general processes ofnon-linear optics violate time reversal symmetry. The phenomena of non-linearoptics violating time reversal symmetry just as sum frequency, doublefrequency, different frequencies, double stable states, self-focusing andself-defocusing, echo phenomena, as well as optical self-transparence and selfabsorptions and so on are analyzed.

Retarded Interaction of Electromagnetic field and Symmetry Violation of Time Reversal in Non-linear Optics