Optical limiting effect of C₇₀ solution at 1064  nm

In this paper, we investigate the optical limiting effect of C₇₀ solution at a wavelength of 1064 nm. We experimentally measured the transmittance of C₇₀ solution under three different concentrations (0.25, 0.5, and 1 mmol/L), three different solution thicknesses (5, 10, and 20 mm), and two different solvents (toluene and xylene) and obtained the values of absorption cross sections and relaxation times in the five-level absorption model of C₇₀ solution. The influences of concentration, thickness, and solvent on the optical limiting effect of the C₇₀ solution are analyzed. We also measured transmittance of C₆₀ solution under the same conditions and compared the results with those of C₇₀ solution. The experimental results show that concentration and solution thicknesses have great influence on the optical limiting ability of C₇₀ solution. The optical limiting effect of C₇₀ solution is better than that of C₆₀ solution at low concentration and worse than that of C₆₀ solution at high concentration.