Components of the crystal quadratic susceptibility tensor ,y"' for second-harmonic generation are calculated for the title compound, 4-(N, N-dimethylamino)-2-acetamido-niitrobenzene Input data are the crystal structure and refractive indices and CNDO hyperpolarizabilities; two different sets of refractive indices give similar results The calculations yield effective polarkabilities as well as both rigorous and anisotropic Lorentz local electric fields Susceptibility components are close to 10 pm V-', rather smaller than those deduced experimentally and showing a weaker dependence on direction; Kleinman symmetry is mostly observed within 10% Screened dipoledipole interactions using CNDO dipole moments amount to -80 kJ mol-', implying permanent fields of 2 GV m-'

Theory of molecular optoelectronics. IX. Calculation of χ(2) from theoretical hyperpolarizabilities for DAN

We present a mode field analysis of the second‐harmonic electromagnetic wave that radiates from a nonlinear core bounded by a dielectric cladding. With this analysis the ultimate performance of the organic crystal‐cored single‐mode optical fiber waveguide as a guided‐wave frequency doubler is evaluated through the solution of nonlinear parametric equations derived from Maxwell’s equations under some assumptions. As a phase‐matching scheme we consider a Cerenkov approach because of advantages in actual device applications, in which the phase matching is achievable between the fundamental guided LP01 mode and the second‐harmonic radiation (leaky) mode. Calculated results for organic cores made of benzil, 4‐(N, N‐dimethyl‐amino)‐3‐acetamidonitrobenzen, 2‐methyl‐4‐nitroaniline, and 4’‐nitrobenzilidene‐3‐acetoamino‐4‐metxianiline provide useful data for designing an efficient fiber‐optic wavelength converter utilizing nonlinear parametric processes. A detailed comparison is made between results for infinite an...

Field analysis of the Cerenkov doubling of infrared coherent radiation utilizing an organic crystal core bounded by a glass capillary

Chapter 5 – QUADRATIC NONLINEAR OPTICAL EFFECTS IN CRYSTALLINE WAVEGUIDING STRUCTURES

DAN crystal cored fibers of good optical quality were grown with the inverted Bridgman-Stockbarger technique and characterized by optical, nonlinear optical, and x-ray experiments.

4-(N,N-dimethylamino)-3-acetamidonitrobenzene single-crystal cored fibers for nonlinear optical uses

The growth and characterisation of fibres containing a crystalline core of the nonlinear organic compound DAN in silica and higher refractive index capillaries is described. In addition to measuring the optical properties in transmission a method is described of measuring the sideways scatter from such fibres in order that a fuller understanding be made of factors which limit the achievement of very high SHG efficiencies.

Efficient Second Harmonic Generation From 2-(N,N-Dimethylamino)-5-Nitroacetanilide (DAN) Crystal Cored Fibres

The growth and characterisation of a number of organic single crystals, e.g. benzil, 2–methyl–4– nitroaniline and 2–N,N–dimethylamino–5–nitroacetanilide, in silica capillary has become fairly well established over recent years. [1–6 ] However the growth of these same compounds in glass capillary with a much higher refractive index than silica has received little interest. Crystal cored fibres, ccf's, in which there is a close match of the refractive index of the cladding to that of the core allows the possibility of fabricating single mode waveguides with useful dimensions for crystal growth. There is a better overlap integral between phase matched fundamental and second harmonic modes in a low moded structure than in a structure with more allowable modes and thus a rise in the conversion efficiency can be expected if the correct dimensions of waveguide are chosen. If a ccf of high conversion efficiency, 10% at 0.1 mW average power, could be made then the promise of fabricating an organic optical nonlinear device, e.g. parametric amplifier, might be realised. In this paper we will describe how the growth method adopted for silica clad organic crystals has been adapted for their growth in a range of Schott glasses which are better matched in refractive index, RI, than silica to the organic material. The linear and nonlinear optical properties of these crystal cored fibres will be given in terms of; the orientation of the crystal axes with respect to the fibre direction; the sideways scattering characteristics from defects; the throughput of the fundamental beam; the polarisation states of both the fundamental and the second harmonic outputs; and the overall efficiency of second harmonic generation.

The Growth of Organic Single Crystals in Glass Capillaries for Second Harmonic Generation

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Efficient Second Harmonic Generation From 2-(N,N-Dimethylamino)-5-Nitroacetanilide (DAN) Crystal Cored Fibres

The Growth of Organic Single Crystals in Glass Capillaries for Second Harmonic Generation