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Claude Runser

Bio: Claude Runser is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Hyperpolarizability & Acceptor. The author has an hindex of 8, co-authored 11 publications receiving 843 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the reduction of the bond length alternation (BLA) in the polyenic chain has been investigated, and unprecedented quadratic hyperpolarizabilities (p) have been achieved (up to p(0) =I500 x 10-30esu) by reduction.
Abstract: Donor-acceptor polyenes of various lengths, and that combine aro- matic electron-donating moieties with powerful heterocyclic electron-withdraw- ing terminal groups, have been synthe- sized and characterized as efficient non- linear optical (NLO) chromophores. Their linear and nonlinear optical proper- ties have been investigated, and variations in these properties have been related to ground-state polarization (dipole p) and structure. In particular, unprecedented quadratic hyperpolarizabilities (p) have been achieved (up to p(0) =I500 x 10-30esu) by reduction of the bond- length alternation (BLA) in the polyenic chain. In each series of homologous com-

362 citations

Journal ArticleDOI
19 Jan 1996-Science
TL;DR: In this paper, a conjugated donor-acceptor chromophore was applied to polycarbonate at 20 percent weight loading to obtain a polymer film with an electro-optic coefficient, r_(33), of 55 picometers per volt at 1.313 micrometers.
Abstract: Syntheses of a series of conjugated donor-acceptor chromophores, based on a strongly electron-withdrawing heterocyclic acceptor, have led to compounds with large second-order optical nonlinearities. Incorporation of one of these chromophores into polycarbonate at 20 percent weight loading yielded, after poling at 150 volts per micrometer, a polymer film with an electro-optic coefficient, r_(33), of 55 picometers per volt at 1.313 micrometers. This value is roughly twice that of lithium niobate. A variant of one of these chromophores exhibited improved thermal stability as needed for use in polymers with higher glass transition temperatures. The chromophore was soluble in common organic solvents, had a scalar product of the dipole moment, μ, and the molecular first hyperpolarizability, β (corrected for dispersion), of roughly 5000 × 10^(−48) electrostatic units, and showed less than 10 percent decomposition after heating for 20 minutes in air and at 200°C in an inert organic solvent.

193 citations

Journal ArticleDOI
TL;DR: In this paper, the authors established analytical structure/(hyper)polarizability relationships for donor-acceptor conjugated molecules, within the framework of the two-state approximation.

118 citations

Journal ArticleDOI
TL;DR: In this paper, the authors compared the behavior of two series of soluble push-pull diphenyl polyenes with respect to the number n of double bonds in the polyenic chain, the exponent value a depending markedly on the end groups.

103 citations

Journal ArticleDOI
TL;DR: In this paper, the 1 H nuclear magnetic resonance spectra of two phenoxide-pyridinium derivatives were used to check if the ground state geometry is changed, and spin-lattice relaxation rates for one compound were measured and the angle between the two aromatic rings calculated.

36 citations


Cited by
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Journal ArticleDOI
28 Aug 1997-Nature
TL;DR: The ability of nonlinear optical materials to transmit, process and store information forms the basis of emerging optoelectronic and photonic technologies as discussed by the authors, where organic chromophore-containing polymers, in which the refractive index can be controlled by light or an electric field, are expected to play an important role.
Abstract: The ability of nonlinear optical materials to transmit, process and store information forms the basis of emerging optoelectronic and photonic technologies. Organic chromophore-containing polymers, in which the refractive index can be controlled by light or an electric field, are expected to play an important role.

974 citations

Journal ArticleDOI

863 citations

Journal ArticleDOI
19 Jan 1996-Science
TL;DR: A recent hydrographic survey showed that an influx of the Aegean Sea water has replaced 20 percent of the deep and bottom waters of the eastern Mediterranean as discussed by the authors, where the only source of such waters was the Adriatic Sea.
Abstract: Results from a recent hydrographic survey show that an influx of Aegean Sea water has replaced 20 percent of the deep and bottom waters of the eastern Mediterranean. Previously, the only source of such waters was the Adriatic Sea, and the waters of the eastern Mediterranean were in near-steady state. The flux changed the water characteristics and displaced older waters upward. Its cause was increasing Aegean Sea salinity, resulting from changes in either the circulation pattern or the large-scale freshwater balance. Current deepwater studies may be affected by the intrusion, but effects might be found also at shallower depths and over a larger region.

651 citations

Journal ArticleDOI
TL;DR: In this article, the authors deal with recent and important developments in the field of organic materials for second-order nonlinear optics, focusing on current trends in chromophore design with a discussion of current progress and problems.
Abstract: This paper deals with recent and important developments in the field of organic materials for second-order nonlinear optics. Attention is drawn to current trends in chromophore design with a discussion of current progress and problems in this field. A number of important classes of chromophores, such as one-dimensional charge-transfer molecules, octopolar compounds, ionic materials, multichromophore systems and organometallics, are discussed.

545 citations