Abstract
In this research, the diffraction ring patterns scan and single-beam Z-scan techniques were used to measure the nonlinear refractive index (n2) and nonlinear absorption coefficient (β). Nano-composite sample, which consists of zinc oxide nanoparticles (ZnO-NPs), and epoxy resin polymer. The sample was prepared by the casting method. A second harmonic generation Nd: YAG laser, which operates at 532 nm and intensity 3183 W/cm2 was used for the two techniques. Z-scan results showed that values for nonlinear refractive index n2 and nonlinear absorption coefficient β were obtained of 6.59*10-9 cm2/W and 1.75*10-3 cm/W respectively. While results for the D-scan technique showed that the number of rings increases with the increasing of laser power.
Highlights
Technological and scientific interest are focused on polymer nano-composites, because of their photonic applications like optical switching and optical limiting devices [1]
The value of the absorption coefficient calculates by using Eq (1), where the value was (12.35 cm-1) at the wavelength (375nm) of nano-composites zinc oxide nanoparticles (ZnO-NPs) /epoxy at the concentration for Zinc oxide (ZnO)-NPs (1*10-4 ) mol/L
Transparent (ZnO-NPs/epoxy resin) nano-composite with high UV light-shielding efficiency was reported in this research
Summary
Technological and scientific interest are focused on polymer nano-composites, because of their photonic applications like optical switching and optical limiting devices [1]. Those nano-composites are a type of combined material that consists of relatively small nanoparticles at nanometer-sized, which are dispersed in a polymer of uniform shape [2]. The optical properties of nano-composites obtained very interesting because they are different from single polymers, they give new properties which extremely from that the traditional materials [4]. There are many techniques for measuring nonlinear optical properties of materials such as diffraction ring patterns, Z-scan, and thermal lens. We will calculate the nonlinear refractive index (n2), nonlinear absorption coefficient (β) and the total change in refractive index (Δn) by using the two techniques
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