The third-order nonlinear optical properties of C_{60}/poly(dimethylacetylendicarboxylate) have been studied using Z-scan technique. Experiments are performed using a CW diode laser at 635 nm wavelength and 26 mW power. The nonlinear absorption coefficient β, nonlinear refractive index n₂, Reχ³, and Imχ³ in C_{60} doped poly(dimethylacetylendicarboxylate) are measured using Z-scan data. Our results show that the values of the nonlinear optical parameters (β, n₂, Reχ³, and Imχ³) of C_{60} doped poly(dimethylacetylendicarboxylate) are smaller than the polymer itself.
The organic-inorganic hybrid salt: 1,1'-methylenedipyridinium pentacynidonitrosoferrate(II)pentahydrate is synthesized and characterized by multinuclear NMR, IR, and UV-vis spectroscopies and elemental analysis. The third order nonlinear optical properties of the new complex in an aqueous solution have been studied using Z-scan technique. Measurements were performed for input intensities (I₀) of 437 and 241 W/cm² for the two concentrations with a CW diode laser at 635 nm wavelength. The nonlinear optical absorption coefficient (β) and nonlinear refraction (n₂) are found at 1.28×10¯³ cm/W and 10.17×10¯⁹ cm²/W, respectively. The overall results suggested that better nonlinearity was observed at a higher concentration of sample. Our results suggest that this material is considered as a promising candidate for future optical device applications.
The third-order nonlinear optical properties of 1,1'-methylenedipyridinium bis[tetrachloride gold(III)] were investigated by the z-scan method using CW diode laser. The experimental results led to estimation of the nonlinear optical absorption coefficient (β), the nonlinear optical refraction (n₂), and third-order nonlinear optical susceptibility (χ³). Our results show that the excited-state absorption cross-sections (σ_{ex}) is larger than the ground-state absorption cross-sections (σ_{g}), this suggests that the nonlinear optical absorption in the MPTC gold(III) is due to the reverse saturable absorption mechanism. Furthermore, the obtained results suggest that our material is considered as a promising candidate for future optical devices applications.
Optical limiting performances of acid blue 29 are investigated under irradiation by a 35 mW continuous wave He-Ne laser. The optical limiting behavior is investigated by using transmission measurement through samples with different concentrations. Our results show that the optical limiting efficiency is concentrations dependence. Induced self-diffraction patterns are observed at relatively high intensities starting from 15 mW.
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