Introduction to Nonlinear Optics. H. R. Khalesifard Institute for Advanced Studies in Basic Sciences Email: firstname.lastname@example.org. Contents. Introduction The essence of nonlinear optics Second order nonlinear phenomena Third order nonlinear phenomena Nonlinear optical materials
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H. R. Khalesifard
Institute for Advanced Studies in Basic Sciences
Emission of Radiation
Two groups were working on Maser in 50s
A laser beam
Nonlinear optics started by the discovery of Second Harmonic generation shortly after demonstration of the first laser.
(Peter Frankenet al 1961)
When the intensity of the incident light to a material system increases the response of medium is no longer linear
The response of an optical medium to the incident electro magnetic field is the induced dipole moments inside the medium
Dipole moment per unit volume or polarization
The general form of polarization
Tunable radiation in the
UV Spectral region.
The low frequency photon, amplifies in the presence of high frequency beam . This is known as parametric amplification.
Difference Frequency Generation
The third order polarization will have 22 components which their frequency dependent are
One can define an effective susceptibility
The refractive index can be defined as usual
The signal wave
The phase conjugated wave
The four interacting waves
The nonlinear polarization
The same form as the phase conjugate of A3