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A quantum mechanical - Electrodynamical approach to nonlinear properties: Application to optical power limiting with platinum-organic compounds
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2007 (English)In: Journal of nonlinear optical physics and materials, ISSN 0218-8635, Vol. 16, no 2, 157-169 p.Article in journal (Refereed) Published
Abstract [en]

Light propagation in a medium is sensitively dependent on the shape and intensity of the optical pulse as well as on the electronic and vibrational structure of the basic molecular units. We review in this paper the results of systematic studies of this problem for isotropic media. Our theoretical approach - the quantum mechanical-electrodynamical (QMED) approach - is based on a quantum mechanical account of the many-level electron-nuclear medium coupled to a numerical solution of the density matrix and Maxwell's equations. This allows us to accommodate a variety of nonlinear effects which accomplish the propagation of strong light pulses. Particular attention is paid to the understanding of the role of coherent and sequential excitations of electron-nuclear degrees of freedom. The QMED combination of quantum chemistry with classical pulse propagation enables us to estimate the optical transmission from cross sections of multi-photon absorption processes and from considerations of propagation effects, saturation and pulse effects. Results of the theory suggest that in the nonlinear regime, it is often necessary to simultaneously account for coherent one-step and incoherent step-wise multi-photon absorption, as well as for off-resonant excitations even when resonance conditions prevail. The dynamic theory of nonlinear propagation of a few interacting intense light pulses is highlighted here in a study of the optical power limiting with platinum-organic molecular compounds. © World Scientific Publishing Company.

Place, publisher, year, edition, pages
2007. Vol. 16, no 2, 157-169 p.
Keyword [en]
Light propagation, Platinum-organic compounds, QMED
National Category
Theoretical Chemistry
URN: urn:nbn:se:kth:diva-198775DOI: 10.1142/S0218863507003652ISI: 000250970200002ScopusID: 2-s2.0-34547397500OAI: diva2:1059020

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Available from: 2016-12-22 Created: 2016-12-21 Last updated: 2017-01-09Bibliographically approved

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