Abstract
The optical response of atoms, molecules, and condensed matter is often described by writing the induced current density J as the time derivative of a polarization P, J = dP/dt, and introducing a series of optical susceptibilities that relate P to powers of the electric field. At intensities that are not too high this approach is both successful and physically meaningful, in that different optical processes of interest -such as second-harmonic generation, the electro-optic effect, optical rectification, and the linear and nonlinear contributions to the index of refraction - can be identified with different frequency components of the various susceptibilities.
© 1999 Optical Society of America
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