Investigation of optical nonlinearities of azo nickel chelate compound by the Z-scan technique

With picosecond pulses at a wavelength of 532 nm, we measured the nonlinear transmittance of Ni-azo metal chelate compound film by the Z-scan technique. The nonlinear optical response was determined fluence dependent. The excited singlet state absorption cross-section σ es and the nonlinear refraction cross-section σ r as well as the effective third-order nonlinear refractive index n 2 eff have been obtained.