Nonlinear optical properties of organic and polymeric materials
29 Sep 1983-
About: The article was published on 1983-09-29 and is currently open access. It has received 762 citations till now.
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12 Jul 1996
TL;DR: The crystallization features of thin single crystalline films of mNA and COANP compounds grown between two fused quartz plates, one of which has a recess in the middle, are described in this article.
Abstract: The crystallization features of thin single crystalline films of mNA and COANP compounds grown between two fused quartz plates, one of which has a recess in the middle, are described. The depth of the recessed spot was of the grown crystal thickness which range d form 1 to 10 micrometers. A possible explanation of the crystallization peculiarities of the COANP compound is given .The crystallographic and optical indicatrix orientations of the crystal s are discussed, and applied to measurement of the efficiency of the second harmonic of the Nd:YAG laser operating at 1.064 micrometers, and generated by our films. The pattern of the intensities of the second harmonic generation is discussed, and a possible explanation of the discrepancy between the experimental and theoretical data is given.
8 citations
12 Jun 1989
TL;DR: In this article, a review of organic nonlinear optical materials for application to eye and sensor protection is presented, including a brief discussion of the functioning of the eye and delineation of some of the important eye protection parameters.
Abstract: : Recent developments in organic nonlinear optical materials for application to eye and sensor protection are reviewed. This compendium includes a brief discussion of the functioning of the eye, delineation of some of the important eye protection parameters and an introduction to the origin of nonlinear optical effects and how they are measured. Specific examples of proposed or prototyped protection devices are also presented. A compilation of noteworthy organic third-order nonlinear optical materials is included as an appendix. Lasers are playing an important and increasing role in modern society. Their present uses range from compact disc players to optical data-storage and communication systems. Because of this wide-spread use, the continuing expansion of lasers into other arenas and the low damage thresholds of human eyes and electro-optic sensors, there is increasing concern about eye and sensor protection from laser irradiation.
8 citations
TL;DR: The resonance Raman-based analysis is shown to account reasonably well for the dispersion of the hyperpolarizability of the two charge transfer chromophores.
Abstract: The effect of vibrational structure on the frequency dependence of the first molecular hyperpolarizability of two thiophene-based charge-transfer chromophores is investigated. A time domain formulation is used to express the polarizability. The new expression includes the solvent-induced inhomogeneous distribution of electronic transition frequencies as well as the effect of the motion of solvent molecules that modulates the vibrational and electronic transition frequencies of the nonlinear optical molecule on which the first molecular hyperpolarizability depends. Resonance Raman scattering and one-photon absorption spectra of the chromophores are measured. By simultaneously fitting the experimental one-photon absorption spectrum and Raman cross sections of vibrational lines derived from resonance Raman scattering to a theoretical model, important parameters needed for the calculation of the first molecular hyperpolarizability are obtained. The first molecular hyperpolarizability is calculated as a function of frequency covering both nonresonance and two-photon resonance regions. The calculated result is compared with the measured hyperpolarizability as a function of frequency of the excitation laser. The resonance Raman-based analysis is shown to account reasonably well for the dispersion of the hyperpolarizability of the two charge transfer chromophores.
8 citations
TL;DR: In this paper, a series of substituted aromatic carboxylate anions and esters were investigated by semi-empirical molecular orbital calculation, and the optical properties of methyl 4-methoxybenzoate and its oligomers were studied by both calculation and experiment.
Abstract: In order to find short cutoff and large β materials for second-order nonlinear optics, a series of substituted aromatic carboxylate anions and esters were investigated by semiempirical molecular orbital calculation. Methyl benzoates with a weak donor or benzoate anions with a weak acceptor at para-position were found to satisfy those conditions. Among them, optical properties of methyl 4-methoxybenzoate and its oligomers were studied by both calculation and experiment. The μβ values of oligomers consisting of N monomeric units were found to become N-times larger than the sum of N isolated monomers, though the absorption cutoff of oligomers stays almost the same as that of methyl 4-methoxybenzoate.
8 citations
TL;DR: In this article, the applicability of the Valence Effective Hamiltonian (VEH) method to calculations of theoretical molecular linear polarizabilities by the Sum-Over-States (SOS) methodology is investigated.
Abstract: In this paper, we investigate the applicability of the Valence Effective Hamiltonian (VEH) method to calculations of theoretical molecular linear polarizabilities by the Sum-Over-States (SOS) methodology. Test calculations are presented on the polyene series. They indicate that the method gives qualitatively the same trends asab initio small basis sets calculations.
8 citations