Abstract
A huge potential from researchers was presented for enhancing the nonlinear optical response for materials that interacts by light. In this work, we study the nonlinear optical response for chemically prepared nano- fluid of silver nanoparticles in de-ionized water with TSC (Tri-sodium citrate) protecting agent. By the means of self-defocusing technique and under CW 473 nm blue laser, the reflected diffraction pattern were observed and recorded by CCD camera. The results demonstrate that, the Ag nano-fluid shows a good third order nonlinear response and the magnitude of the nonlinear refractive index was in the order of 10−7 cm2/W. We determine the maximum change of the nonlinear refractive index and the related phase shift for the material at six input laser intensities.
Highlights
Changes in refractive index induced by an optical field can give rise to various nonlinear phenomena in optical materials [1]
When a Gaussian laser beam passes through a nonlinear medium, it may exhibit a characteristic diffraction ring pattern resulting from spatial self-phase modulation (SSPM) [3], this far-field diffraction ring pattern has caused much attention since first reported in 1967s for its unique properties and potential applications [4]
This wavelength is near the resonance absorption peak of the prepared silver nanoparticles which is around 430 nm
Summary
Changes in refractive index induced by an optical field can give rise to various nonlinear phenomena in optical materials [1]. العزاق، تغذاد، جاهعح تغذاد,هعهذ الليشر للذراساخ العليا1
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