Kramers-Kronig relations and sum rules in nonlinear optical spectroscopy.
The full potential of the Kramers-Kronig relations and sum rules for nonlinear susceptibilities has unfortunately drawn relatively little attention in nonlinear optical spectra analysis. In this feature article a simple treatment of an anharmonic oscillator model in description of the nonlinear susceptibility of media and holomorphic properties of the nonlinear susceptibility were utilized. Using such concepts, conventional Kramers-Kronig, multiply-subtractive Kramers-Kronig, and generalized Kramers-Kronig dispersion relations can be derived. We demonstrate how in practice the variety of different Kramers-Kronig relations mentioned above, as well as various sum rules, can be applied in nonlinear optical spectra analysis. As an example we treat the third-harmonic wave generation spectrum from a polymer.
Peiponen
Kai-Erik
KE
Department of Physics, University of Joensuu, FIN-80100 Joensuu, Finland.
Lucarini
Valerio
V
Saarinen
Jarkko J
JJ
Vartiainen
Erik
E