Abstract
Role of nonlinear optical phenomena forms the basis for many optical devices. Suitability of the material depends on its large magnitude of the relevant nonlinear effect. Tetra tolyl porphyrins (TTP) are investigated in the present work in order to study the enhancement in third order susceptibility ( χ (3) ) through the higher excited states. TTPs with different metal ions are investigated to evaluate the second order hyperpolarizability γ , using both ps and ns lasers. An incoherent laser spectroscopic technique is used to evaluate the excited state dynamics. Optical limiting properties are investigated by altering the intersystem crossing rates from singlet to triplet states.
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