Third order non-linear response as function of the laser power in SiO2:DR1 mesostructured and amorphous films

J. A. García-Macedo; G. Salas-Gamez

doi:10.1117/12.2274722

30 August 2017 Third order non-linear response as function of the laser power in SiO₂:DR1 mesostructured and amorphous films

J. A. García-Macedo, G. Salas-Gamez

Author Affiliations +

Proceedings Volume 10356, Nanostructured Thin Films X; 1035605 (2017) https://doi.org/10.1117/12.2274722
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States

Abstract

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.

Conference Presentation

Citation Download Citation

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 (30 August 2017); https://doi.org/10.1117/12.2274722

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