We report here the experimental investigation on third-order nonlinear optical parameters of 5,10,15,20-tetrakis(2,3,5,6-tetrafluoro-N,N-dimethyl-4-anilinyl)porphyrin and its various metal complexes, using Z-scan technique at 532 nm. The third-order nonlinear optical susceptibilities (χ(3)) were of the order 10(-12) esu and are compared through degenerate four wave mixing (DFWM). The operating mechanism is reverse saturable absorption (RSA) as the effective excited-state absorption cross-section was found higher than ground state absorption cross-section as well as the magnitude of nonlinear absorption coefficient was found decreasing with on-axis input intensity. The compounds found to exhibit good optical limiting at 532 nm, 7 ns excitation steering applications in laser safety.

中文翻译：

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介孔四（2,3,5,6-四氟-N，N-二甲基-4-苯胺基）卟啉及其金属配合物的三阶非线性光学研究。

我们在这里报告对5,10,15,20-四（2,3,5,6-四氟-N，N-二甲基-4-苯胺基）卟啉及其各种金属配合物的三阶非线性光学参数的实验研究，使用532 nm的Z扫描技术。三阶非线性光学磁化率（χ（3））约为10（-12）esu，并通过简并四波混频（DFWM）进行比较。其工作机制是反向饱和吸收（RSA），因为发现有效激发态吸收截面比基态吸收截面高，并且发现非线性吸收系数的幅度随轴上输入强度而减小。在激光安全性方面，发现该化合物在532 nm，7 ns激发控制应用中表现出良好的光学限制。