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New stilbene compounds for nonlinear optics 177502
Functionalized heteroaromatics for secondorder nonlinear optical applications 177504
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absorption band absorption spectra Appl applied aromatic beam bleaching bond length bond length alternation calculated charge transfer Chem chromophores COANP compounds conjugated crystal curves decay dependence devices dicyanovinyl dielectric dipole moments dithiolene effect EFISH electric field electro-optic coefficients electronic energy excited exciton experimental Figure frequency glass transition temperature heteroaromatic heterocyclic hyperpolarizability intensity laser layer Lett linear loss materials measured method mode modulation molecular molecules NMBA nonlinear optical nonlinear optical properties observed obtained optical nonlinearity optimized order nonlinear optical organic orientation PDA-4BCMU PDAs peak phase phase-matching photon Phys PMMA polarizability polarization poled polymer polyacetylene polyene polymer polymer films polymeric pulse pump refractive index relaxation resonance rings sample second harmonic second order nonlinear second-order self-trapped shown in Fig solution solvatochromic solvent spectrum SPIE spin coating stilbenes structure studies substrate Table TCNQ temperature thermal thickness thin films thiophene third-order values waveguide wavelength