Second-order polarizabilities of some aromatic molecules

Variation of the Backbone Conjugation in NLO Model Compounds: Torsion‐Angle‐Restricted, Biphenyl‐Based Push‐Pull‐Systems

“…Several models were developed for a quantitative analysis of the nonlinear optical response. [9][10][11][12][13] Oudar and Chemla established oxidation of primary amines to nitro groups in the presence of a tertiary amine summarizes the synthetic pathway towards the desired model compounds. NLO properties of the series of torsionally constrained push-pull biphenyls are collected by electric-field-induced second-harmonic generation (EFISH) experiments.…”

Synthesis and crystal structure of guanidinium L-monohydrogentartrate: encapsulation of an optically nonlinear octupolar cation

“…The variety of chemical substitutions provided by organic chemistry guided by empirical as well as more elaborate theoretical models has allowed for the targeted tailoring of optimized crystals towards quadratic nonlinear optics Zyss & Chemla, 1987). Molecular nonlinear evaluations from the EFISH experiment (Levine & Bethea, 1974;Oudar & Le Person, 1975, 1976Ledoux & Zyss, 1982), related by an oriented gas model, have been very useful for selective development of such crystals. Besides purely crystallographic structural considerations, the spectral adequacy of crystals has also been discussed, in view of applications, in terms of a 'transparencyefficiency' trade-off based on both molecular (Zyss, 1991a) and excitonic considerations (Zyss, Ledoux, Bertault & Toupet, 1991;Pierre, Baldeck, Block, Georges, Trommsdorf & Zyss, 1991).…”

Nonlinear refractive index and three-photon absorption coefficient of poly(9,9-dioctylfluorence)

“…17 Moreover, we can potentially improve the third-order nonlinearity further by introducing electron donor and acceptor groups into a conjugated system. 22 The origin of the measured refractive nonlinearity in PFO is attributed to bound electronic effects and is confirmed by its THG response using laser pulses from the OPA. For THG experiments, PFO solution with the same concentration ͑6 mg/mL in chloroform͒ was loaded into a 12 mm thick vial to increase the THG interaction length.…”