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The third-order optical nonlinearities of thiophene-bearing phthalocyanines (Ni-TPc and Cu-TPc) measured using Z-scan technique at 532nm have three features: firstly, both Ni-TPc and Cu-TPc showed large molecular cubic hyperpolarizabilities γ whose values were of the order of 10 −30 esu; secondly, the nonlinear absorption and the nonlinear refraction contribute almost equally to their molecular...
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