Journal
PHYSICA B-CONDENSED MATTER
Volume 578, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physb.2019.411847
Keywords
Self-phase modulation; Thermal nonlinearity; Nonlinear refractive index; Diffraction ring pattern; Z-scan technique; Optical limiting
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In this work, the study of the nonlinear optical properties of poly eosin-Y phthalate solution using the diffraction ring patterns and the Z-scan methods are presented. The diffraction ring patterns were observed when a low power laser beam of wavelength of 473 nm passed through the poly eosin-Y phthalate solution. It was found that the number of rings and diameter of the outer-most ring in each pattern depends on the incident intensity of the laser beam and type of the beam wave front. The Fresnel-Kirchhoff diffraction integral theory was used to simulate the diffraction ring patterns and found good agreement with experimental results. Both diffraction ring patterns and closed aperture Z-scan techniques were used to calculate the nonlinear refractive index, while open aperture Z-scan was used to calculate the nonlinear absorption coefficient of the poly eosin-Y phthalate solution. The possibility of using the sample as an optical limiter is tested.
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