▎ 摘　　要

Reduced graphene oxide (rGO) suspensions with different reduction levels have been successfully produced by 405 nm continuous wave (CW) laser irradiation. The linear and nonlinear optical properties of the graphene oxide and rGO samples have been measured by the 532 nm CW laser beam. Furthermore, the photoluminescence (PL) spectra of the samples are measured by exciting them with laser light at wavelengths of 405 and 532 nm. Results illustrate that the graphene oxide suspensions show important nonlinear refractive response at 532 nm laser excitation. It is also shown that the values of the linear absorption coefficient, nonlinear refractive index and optical limiting threshold of the samples are increased by increasing the degree of reduction. While, the PL intensity of the rGO samples is decreased by increasing the reduction level. These findings highlight the significant role of the reduction process in the optical properties of the rGO suspensions.