title: Third-order nonlinear optical investigations of meso-tetrakis(2,3,5,6-tetrafluoro-N,N-dimethyl-4-anilinyl)porphyrin and its metal complexes.
abstract: 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.
authors.affiliation: Laser and Nonlinear Optics Laboratory, Department of Physics, National Institute of Technology Calicut, Kozhikode 673601, Kerala, India.
authors.forename: N K
authors.initials: NK
authors.lastname: Siji Narendran
authors.affiliation: Bioinorganic Materials Research Laboratory, Department of Chemistry, National Institute of Technology Calicut, Kozhikode 673601, Kerala, India.
authors.forename: Rahul
authors.initials: R
authors.lastname: Soman
authors.affiliation: Bioinorganic Materials Research Laboratory, Department of Chemistry, National Institute of Technology Calicut, Kozhikode 673601, Kerala, India.
authors.forename: Chellaiah
authors.initials: C
authors.lastname: Arunkumar
authors.affiliation: Laser and Nonlinear Optics Laboratory, Department of Physics, National Institute of Technology Calicut, Kozhikode 673601, Kerala, India. Electronic address: csk@nitc.ac.in.
authors.forename: K
authors.initials: K
authors.lastname: Chandrasekharan
mesh_terms: D054879:Halogenation; D008665:Metalloporphyrins / Q000737:chemistry*; D008745:Methylation; D008958:Models, Molecular; D017711:Nonlinear Dynamics; D055620:Optical Phenomena; D055672:Static Electricity
chemical_list: D008665:Metalloporphyrins
keywords: Degenerate four wave mixing; Nonlinear optics; Optical limiting; Z-scan