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Nonlinear properties of unfilled d shell metal porphyrins using the beam waist relative variation method

We study the nonlinear absorption and refraction of 5,10,15,20-tetraphenyl-21H,23H-porphin cobalt(II) (CoTPP) and 5,10,15,20-tetrakis(4-methoxyphenyl)-21H,23H-porphin cobalt(II) (MCoTPP). The measurements were carried out in solutions prepared in chlorobenzene applying the D4σ-Z-scan technique with a laser delivering single pulses in the picosecond regime at 532 nm. For each compounds, the NL coefficients were measured for three concentrations. The results show that these materials with unfilled d shell exhibit a saturable absorption (SA), where they have been compared to the basic structure tetraphenylporphyrin TPP and zinc tetraphenylporphyrin ZnTPP with filled d shell metal in order to see the influence of the central metal ion on the nonlinear absorption behavior.