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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TL;DR: In this article, the linear electro-optical effect has been studied in test samples of two different nonlinear optical polymers, with Tg of 140°C and 175°C, during and after poling.
Abstract: The linear electro-optical effect has been studied in test samples of two different nonlinear optical polymers–with Tg of 140°C and 175°C, respectively–during and after poling. The electro-optical coefficients were measured between crossed polarizers (r33 – r13) and using the test samples as Fabry-Perot interferometers (r13). The field strength dependence of the coefficients has been measured during poling of the polymer with Tg = 140°C, and compared with theory. Also, the ratio r33/r13 has been investigated. A quasi-instantaneous loss of the field-induced electro-optical activity is observed when the poling field is switched off at ambient temperature after poling in the vicinity of Tg . The influence of an annealing step on the relaxation behavior is discussed. Results of relaxation experiments in the two polymers performed at several constant temperatures are presented.
4 citations
TL;DR: In this article, single crystals of dipotassium fumarate dihydrate (DKFD) have been grown by slow solvent evaporation method and structural characteristics of the grown crystals were studied from single crystal and powder X-ray diffraction analysis.
Abstract: Single crystals of dipotassium fumarate dihydrate (DKFD) have been grown by slow solvent evaporation method. The structural characteristics of the grown crystals was studied from single crystal and powder X-ray diffraction analysis. The crystal system of the grown crystal was found to be monoclinic. The lower cut-off wavelength of DKFD was found at 300 nm and good transparency window was observed from 300 to 1100 nm. The existence of various functional groups was established from FTIR and FT Raman spectroscopy. The study of the molecule is established using NMR spectroscopy. The thermal stability and decomposition behaviour of the grown crystal is analysed using TGA/DTA analyses. Third order nonlinear susceptibility χ 3 of the crystal was measured at the wavelength of 532 nm by z-scan technique. The observed high value of χ 3 is attributed to the hydrogen bond present in the structure of the crystal. Keywords— Dipotassium fumarate dihydrate, Single crystal XRD, Powder XRD, NMR analysis, Z-Scan technique.
4 citations
28 Jan 1987
TL;DR: In this article, a new variation of nonlinear susceptibility measurement in liquids using optical third harmonic generation is described, where the dispersion component of x(3) associated with THG is the least complex among those describing third-order nonlinear polarization processes.
Abstract: A new variation of nonlinear susceptibility measurement in liquids using optical third harmonicgeneration is described. High precision ( -1 %) and throughput are advantages which facilitate observationsof systematic trends and deviations from idealized behavior. Nonlinearities in several simple series ofmolecular liquids are presented and discussed. Introduction Optical third harmonic generation (THG) is an extremely important technique for study of the originsof molecular or polymeric nonlinear polarizability. The dispersion component of x(3) associated with THG is the least complex among those describing third -order nonlinear polarization processes. Material excitations having resonances only at optical or higher frequencies contribute significantly to the THG x(3),in essence assuring that the electronic nonlinearity can be directly and unambiguously probed. Fullerdescription of the THG nonlinearity and the modelling of x(3) in molecular terms may be foundelsewhere.) Counterbalancing the
4 citations
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TL;DR: In this article, the Density Functional Theory (DFT) was used for FT-IR and FT-Raman analysis by means of the hybrid functional DFT/B3LYP with 6-311 G (d, p) basis set.
4 citations
4 citations