Nonlinear optics

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Nonlinear optics (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the dielectric polarization P responds nonlinearly to the electric field E of the light. This nonlinearity is typically only observed at very high light intensities (values of the electric field comparable to interatomic electric fields, typically 108 V/m) such as those provided by pulsed lasers. In nonlinear optics, the superposition principle no longer holds.


Nonlinear optical processes

Nonlinear optics gives rise to a host of optical phenomena:

Frequency mixing processes

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