Fig. 5. (Color online) Normalized transmittance, i.e., Normalized Transmittance(T), according to various indigo carmine concentrations of (a) 0.8 mM (b) 1.6 mM, (c) 2.0 mM (The hollow circles are the measured data and the solid line is the fitting curve.) (d) When an indigo carmine solution concentration of 2.0 mM was used, the nonlinear absorption coefficient β depending on the input intensity.
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