Nonlinear optical study of palladium Schiff base complex using femtosecond differential optical Kerr gate and Z-scan techniques

A femtosecond differential optical Kerr gate (DOKG) and Z-scan techniques, have been applied to investigate the third-order optical nonlinearity of composite film of the coordination complex [PdLPPh3] (L=N-(2-pyridyl)-N′-(salicylidene)hydrazine, PPh3=triphenylphosphine). Film exhibits superior nonlinear optical properties in the near-infrared spectral region. The nonlinear response time and third-order nonlinear optical susceptibility of complex were found to be≤90 fs and 3.9×10−10 esu, respectively. The Z-scan result shows that saturable absorption property of the film and its nonlinear absorption coefficient of the sample was found to be −23 cm/GW.

► A femtosecond DOKG and Z-scan techniques were used to investigate the NLO of the complex. ► Film exhibits superior NLO properties in the near-infrared region. ► The nonlinear response time was≤90 fs and third-order nonlinear optical susceptibility was 3.9×10−10 esu. ► The Z-scan result shows the saturable absorption property of the film. ► Nonlinear absorption coefficient of the composite film was found to be −23 cm/GW.