Abstract
This chapter discusses nonlinear optics. The most important feature of a nonlinear medium is the generation in it of vibrations with new frequencies. If the medium is nondissipative, the frequency transformation process is subject to certain very general relationships, in addition to the obvious condition that the total energy of the vibrations at all frequencies must be conserved. The chapter also discusses optical effects arising from the nonlinear variation of the field at the primary wave frequency. The use of the nonlinear relation presupposes that there is only slight nonlinearity: The higher-order terms must be small in comparison with the terms in electric field induction. The third-order nonlinear effects include the influence of radiation with frequency on the propagation of a wave with a different frequency in the same medium.
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