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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30 Aug 1989
TL;DR: In this article, the authors present a device made of organometallic polymers using picosecond and nanosecond laser pulses, which can be used in nonlinear optical thresholding devices.
Abstract: The large third-order nonlinearity of the organometallic polymers can be utilized in the construction of optical devices. The presence of strong nonlinear absorption and low linear absorption in the visible wavelengths makes these polymers ideal material for use in nonlinear optical thresholding devices. We present here a study of such a device made of organometallic polymers using picosecond and nanosecond laser pulses.
6 citations
TL;DR: In this paper, the static and dynamic polarizability of polymers arising from the cyclic five-membered molecules pyrrole, furane, thiophene and polyaniline has been investigated.
6 citations
TL;DR: In this paper, the Hartree-Fock (HF) approximation of the dipole moment of a series of 16 four-membered heterocycles with an exocyclic double bond at position 3 (1-16) was studied.
Abstract: The potential use of small basis sets upon a low level of theory was studied on the calculations of electronic properties (dipole moment, static polarisability and static hyperpolarisabilities) of a series of 16 four-membered heterocycles with an exocyclic double bond at the position 3 (1–16). First, the calculations were performed within the Hartree–Fock (HF) approximation using 6-31G, 6-31G(d,p) and 6-31+G(d,p) as basis sets for the different conformational states of each molecule, and the results obtained were compared with the MP2/6-31+G(d,p) results reported. In the second place, in order to know the real potential of HF calculations, these were compared with those calculated using larger approaches such as MP2/6-311+G(d,p), MP2/aug-cc-pVDZ, CCS/6-311+G(d,p), CCS/aug-cc-pVDZ, CCS/aug-cc-pVTZ, CCSD/6-31+G(d) and CCSD/cc-pVDZ, taken into account only the planar and equilibrium geometries of each molecules. The HF approaches permit us to obtain a good qualitative representation of the dipole mom...
6 citations
TL;DR: In this article, the crystal structure and the linear and nonlinear optical properties of N-(5-nitro-2-pyridyl)-(s)-phenylalaninol have been determined.
Abstract: Crystals of N-(5-nitro-2-pyridyl)-(s)-phenylalaninol having good optical quality were grown from solution. The crystal structure and the linear and nonlinear optical properties were determined. Angle tuned phase matching was achieved with a d eff = 31 pm/V and a conversion efficiency of 0.15% was obtained at the fundamental power of 50 kW/cm2 using a 0.45-mm-thick crystal.
6 citations
TL;DR: In this paper, a phase modulator is in-tegrated in one arm of a Mach-Zehnder interferometer, and intensity switching in addition to phase modulation can be obstructed.
Abstract: Electro-optic devices provide basic functions such as: phase or intensity modulation, optical switching, frequen cy doubling and mixing, etc. for optical communication, processing, computing and storage systems. For example, inte grated electro-optic phase modulators can be used for signal processing. Fur thermore, if the phase modulator is in tegrated in one arm of a Mach-Zehnder interferometer, intensity switching in addition to phase modulation can be ob tained. On bringing two or more parallel channel waveguides within a few mi crons of each other, electro-optically in duced coupling can give rise to the opti cal space switching of signals. Finally thermo-optically induced phase chan ges in liquid crystalline versions of poly mers can be used for optical storage devices. All materials when examined at the atomic or molecular level reveal an assembly of positively and negatively charged particles such as ions and elec trons, which can be displaced by an external electric field. The correspon ding separation of the centres of gravity of the positive and negative charges is called induced electrical polarization. For weak external fields, the induced polarization is nearly proportional to the field strength. For strong fields, how ever, the induced polarization may exhibit noticeable nonlinear contribu tions that are at the root of optically nonlinear phenomena. In principle, all materials show opti cally nonlinear effects if placed in suffi-
6 citations