Measurement of nonlinear optical parameters of graphene oxide by Z-scan

Abstract

The behavior of the non-linear refraction index, the non-linear absorption coefficient and the complex value of the third-order electrical susceptibility of a concentrated graphene oxide solution at 50% m/v and its corresponding dependence on the laser emission power by the Z-scan technique. The value of the non-linear refractive index η 2, non-linear absorption coefficient β and the complex value of the electric susceptibility χ (3) were obtained directly by quantifying the transmittance Normalized of the solution when exposed to the electromagnetic radiation of a Nd: YAG laser emitting at 532 nm in continuous wave mode. It was found that β increases and η 2 decreases exponentially by increasing the emission power, respectively. In addition, it was observed that for powers greater than 30 mW, the phenomena of saturable absorption and non-linear refraction related to the effects of thermal induction and influence of the phenomenon of self-defocalization of the incident radiation, respectively, are manifested.