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The OD of BR at 410, 470, and 570 nm vs time after switching off the illumination. Inset: the absorption spectra of BR vs time after switching off the illumination.
(a) The Z-scan result of BR induced by laser 476 nm with (solid line). The nonlinear refraction curve and the nonlinear absorption curve after applying symmetry method (dashed line and dashed dotted line). Inset: Multiple energy level structure of BR in the Z-scan (top). Experimental setup of Z-scan (bottom). (b) The nonlinear refraction curve (dotted line) and the fitting curve (solid line). Curve 1–5 (dashed line) are the parts of the fitting curve.
The index change in nonlinear refraction of BR vs the laser intensity . Inset: The nonlinear absorption curve of BR after applying symmetry method to the Z-scan result.
The fitting parameters of the nonlinear refraction index.
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