Abstract
The nonlinear responses and optical limiting performance of a dye type acid, called fast green FCF, are investigated under irradiation of 35mW continuous wave He–Ne Laser. The second order refractive index and nonlinear absorption coefficient are measured by use of z-Scan technique. The optical limiting behavior is investigated by transmission measurement through the sample. Linear absorption coefficient (α), nonlinear absorption coefficient (β) and second order refractive index (n2) of fast green FCF are measured at different concentrations.
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