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Società Italiana di Fisica, Nuovo Cimento D, 7-8(20), p. 1117-1125

DOI: 10.1007/bf03185520

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General Properties of Optical Harmonic Generation from a simple Oscillator Model

Journal article published in 1998 by F. Bassani, V. Lucarini ORCID
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This paper is available in a repository.

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Abstract

The nonlinear oscillator model allows a basic understanding of all nonlinear processes and can be adopted to analyse optical vibrational modes and electronic transition in molecules and crystals, in order to derive general properties of harmonic generation to all orders. In particular, we obtain Kramers Kroenig relations and sum rules referred to all momenta of the susceptibility, and Miller's empirical rules to all orders. Since the above properties only depend on time causality and not on the specific microscopic model, they can be adopted for the quantum mechanical description, sustituting in the classical expression the derivatives of the potential with their expectation values. ; Comment: 12 pages, no figures