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A quantum mechanical - Electrodynamical approach to nonlinear properties: Application to optical power limiting with platinum-organic compounds
Institute for lasers, Photonics and Biophotonics SUNY at Buffalo, USA.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Computational Physics .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Computational Physics .
KTH, Stockholm.
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.
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Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-41221DOI: 10.1142/S0218863507003652Local ID: 55364OAI: oai:DiVA.org:liu-41221DiVA: diva2:262072
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2011-01-11

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Henriksson, JohanNorman, Patrick

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