2006 | OriginalPaper | Chapter
SOS Methods in Calculations of Electronic NLO Properties
Authors : Wojciech Bartkowiak, Robert Zaleśny
Published in: Non-Linear Optical Properties of Matter
Publisher: Springer Netherlands
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The sum-over-states technique which is extensively used in calculations of nonlinear optical properties, is presented and discussed. We focus on the electronic contributions to first- and second-order hyperpolarizability. The SOS approach to the calculation of the multiphoton absorption is also discussed. The various approximations to exact sum-over-states formulae are presented. In particular, we describe the so-called few-levels models, which are widely used in qualitative analysis of nonlinear electrical properties