Abstract

We present a simple algorithm for defining a single proxy state that accounts for state truncation in the sum-over-states calculations of the dispersion of the molecular hyperpolarizabilities. The transition strengths between the proxy state and the truncated set of states are determined using the Thomas–Reiche–Kuhn sum rules further constrained by the zero-frequency linear polarizability. This proxy state method can augment experimentally determined parameters or finite-state theories to allow for a more accurate prediction of the nonlinear optical properties of molecular systems. We benchmark this approach by comparison to exact perturbation calculations of one-dimensional power law potentials.

© 2018 Optical Society of America

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