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Search: db:Swepub > Ågren Hans > Mälardalen University

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1.
  • Baev, Alexander, et al. (author)
  • Upconverted lasing based on many-photon absorption : an all dynamic description
  • 2004
  • In: Journal of the Optical Society of America. B, Optical physics. - 0740-3224 .- 1520-8540. ; 21:2, s. 384-396
  • Journal article (peer-reviewed)abstract
    • A theory is developed for the propagation through a nonlinear medium of strong pump and amplifiedspontaneous-emission pulses. The theory is based on a solution of the density matrix equations that aims at providing an adequate treatment of the nonlinear polarization of the material without addressing the Taylor expansion over the powers of intensity. The theory has been applied for modeling of three-photon absorption induced upconverted stimulated emission of organic molecules in solvents. Numerical results are presented for the organic chromophore 4-[N-(2-hydroxyethyl)-N-(methyl)amino phenyl]-4'-(6-hydroxyhexyl sulfonyl) stilbene dissolved in dimethyl sulfoxide. The results are in good agreement with available experimental results.
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2.
  • Cronstrand, Peter, et al. (author)
  • Few-states models for three-photon absorption
  • 2004
  • In: Journal of Chemical Physics. - : American Institute of Physics (AIP). - 0021-9606 .- 1089-7690. ; 121:5, s. 2020-2029
  • Journal article (peer-reviewed)abstract
    • Few-states models are derived for the calculation of three-photon absorption matrix elements. Together with earlier derived few-states models for two-photon absorption, the models are evaluated against results from response theory calculations that provide the full sum-over-states values. It is demonstrated that not even for systems with charge-transfer character, where few-states models for two-photon absorption are in excellent agreement with response theory, do the models provide a quantitatively correct description for three-photon absorption. The convergence behavior, merits, and shortcomings of the models are elucidated in some detail. The role of various characteristics of the electronic structure, such as symmetry, charge transfer, and conjugation-important for the formation of a large three-photon cross section-is analyzed. As for two-photon absorption cross sections, it is essential to consider generalized few-states models also for three-photon absorption, that is, to account for dipolar directions and laser beam polarization. Despite their poor quantitative performance, it is argued that few-states models at times can be useful for interpretation purposes when applied to three-photon absorption.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Ågren, Hans (2)Undo refine
Cronstrand, Peter (2)
Luo, Yi (1)
Norman, P. (1)
Gelmukhanov, Faris (1)
Baev, Alexander (1)
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Rubio-Pons, Oscar (1)
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University
Royal Institute of Technology (2)
Mälardalen University  (2)Undo refine
Linköping University (1)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2004 (2)

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