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Wavelength dependent studies of nonlinear absorption in zinc meso -tetra(p-methoxyphenyl)tetrabenzoporphyrin (Znmp TBP) using Z-scan technique

2001; World Scientific; Volume: 05; Issue: 07 Linguagem: Inglês

10.1002/jpp.357

1099-1409

N. Srinivas, S. Venugopal Rao, D. V. G. L. N. Rao, B. K. KIMBALL, M. Nakashima, Barry S. DeCristofano, D. Narayana Rao,

Porphyrin and Phthalocyanine Chemistry

We report here, our experimental results and theoretical analysis of the dispersion data of nonlinear absorption in zinc meso-tetra-(p-methoxyphenyl)tetrabenzoporphyrin (ZnmpTBP). Using a ns optical parametric oscillator (OPO) we obtain the open aperture Z-scan data over the visible region starting from 480 nm to 600 nm. We use a more general five-level model for evaluating the excited state parameters like excited state absorption coefficients, two-photon absorption coefficient, etc. Due to its large excited state absorption cross-sections this material acts as a very good candidate for a broadband optical limiter in the visible region.