Non-linear optical behavior can be obtained in materials exposed to laser radiation. There are no much results of these properties as function of the structure of the samples. In our case we prepared SiO2;DR1 amorphous samples by sol-gel method, and mesostructured ones by using cethylmethyamonium bromide (CTAB). The hexagonal structure was evidenced by X-ray diffraction. The transmittance of a focused Helium-Neon 394nm laser light was studied in these samples when moving around the focal point. With the results and using the Sheik-Bahae model the third order nonlinear optical absorption coefficient β and refractive index n2 were obtained. The dependence of β as function of the laser power can be fit with an exponential curve that reaches saturation. It is clear the hexagonal structured helps to increase the sensitivity of the sample. In the case of the refractive index as function of the laser power the response is similar, but in this case the mesostructure does not give a strong difference.
J. A. García-Macedo and G. Salas-Gamez, "Third order non-linear response as function of the laser power in SiO2:DR1 mesostructured and amorphous films," Proc. SPIE 10356, Nanostructured Thin Films X, 1035605 (Presented at SPIE Nanoscience + Engineering: August 09, 2017; Published: 30 August 2017); https://doi.org/10.1117/12.2274722.
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