Optical limiting properties of a zinc porphyrin polymer and its dimer and monomer model compounds

F. M. Qureshi, S. J. Martin, X. Long, D. D.C. Bradley, F. Z. Henari, W. J. Blau, E. C. Smith, C. H. Wang, A. K. Kar, H. L. Anderson

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Abstract

We report on the strong decrease in laser light transmission with increasing excitation intensity observed in thin films of a zinc porphyrin polymer and its dimer and monomer model compounds. Nonlinear transmission measurements performed at 532 nm using 500 ps laser pulses show decreases of 40%, 60% and 65% at input fluences of 0.01 J/cm 2 for the monomer, dimer and polymer thin films, respectively. Its application as an optical limiting device for the protection of the eyes and optical sensors from high-fluence laser pulses is assessed. Additional pump-probe measurements performed at 595 nm using 0.8 ps excitation allow us to discuss the strong response in terms of a six-level model of the electronic structure.
Original languageEnglish (US)
JournalChemical Physics
Volume231
Issue number1
DOIs
StatePublished - May 15 1998
Externally publishedYes

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