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/cm2 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 language | English |
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Pages (from-to) | 87-94 |
Number of pages | 8 |
Journal | Chemical Physics |
Volume | 231 |
Issue number | 1 |
Publication status | Published - 15 May 1998 |