Z-scan measurement for the nonlinear absorption and the nonlinear refraction of poly1,4-diazophenylene-bridged-tris(8-hydroxy-quinoline) aluminum (PDPAlq3)

The nonlinear optical properties of the poly1,4-diazophenylene-bridged-tris(8-hydroxy-quinoline) aluminum (PDPAlq3) solution were studied using single beam Z-scan technique with a continuous-wave Diode laser radiation at 657.2 nm with 10 Hz repetition rate. The results show that the solution of PDPAlq3 exhibits large nonlinear refractive index (n2 = −1.7642 × 10−12 m2/W) and nonlinear absorption coefficient (β = 1.12 × 10−6 m/W). The negative sign of the nonlinear refractive index n2 indicates that the material exhibits self-defocusing optical nonlinearity. The evaluation of the figure of merit (W = 1.8) shows that the solution of PDPAlq3 is sufficient for application in all-optical switching technology. These results show that the solution of PDPAlq3 have potential application in nonlinear optics.