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Separation of Electronic and Nuclear Contributions to the Third-Order Nonlinear Optical Susceptibilities of New Tetrathiafulvalene Derivatives Using Degenerate Four Wave Mixing

100%
Sahraoui B., Nguyen Phu X., Sallé M., Gorgues A.
|
EN
We separate the electronic and nuclear contributions to the third-order nonlinear optical susceptibilities χ_{ijkl}^{〈3〉} using degenerate four wave mixing. This method allows to know the physical origin of the optical nonlinearities of new soluble tetrathiafulvalene derivatives and deduce the values of the second-order hyperpolarisabilities γ. The values of γ for the studied compounds are about 10^{5} greater than for CS_{2}.
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The Third-Order Nonlinear Optical Susceptibility in Octupolar Molecule and its Dipolar Subunit

100%
Derkowska B., Sahraoui B., Nguyen Phu X., Andraud C.
Acta Physica Polonica A
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2001
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vol. 99
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issue 1
155-160
EN
The third-order nonlinear optical susceptibility χ^〈3〉 of octupolar molecule with three double bonds was measured using degenerate four wave mixing technique at 532 nm in tetrahydrofuran solution. For comparison, we also measured its analogous dipolar subunit. We found that the χ^〈3〉 value for octupolar molecule is about twice larger than its dipolar subunit.
3
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Influence of Free Carrier Concentration on Nonlinear Absorption of n-Type ZnSe Crystals

88%
Sahraoui B., Chevalier R., Nguyen Phu X., Rivoire G., Bała W.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
1070-1074
EN
The dependence of nonlinear absorption at 532 nm of n-type ZnSe crystals upon annealing temperature and free carrier concentration is reported. The nonlinear optical absorption as well as the efficiency of degenerate four wave mixing of ZnSe are investigated. It is found that the magnitude of the nonlinear absorption decreases with an increase in the electron concentration. The nonlinear refractive index change is estimated.
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