Abstract.
The dynamic nonlinear absorption of a chloroform solution of chlorophyll A was investigated using the Z-scan technique with picosecond pulses at 532 nm. The nonlinear absorption exhibits a reverse saturation, indicating a strong intersystem crossing (singlet–triplet) process. The time evolution of the optical nonlinearity, modeled by means of a five-level energy diagram, allows the determination of excited-state cross sections and the lifetime of the intersystem crossing based on its absorption characteristics and efficient formation of triplet states. Chlorophyll A was found to be a good candidate for a sensitizer in photodynamic therapy.
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Received: 14 February 2002 / Published online: 2 May 2002
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Corrêa, D., De Boni, L., dos Santos Jr., D. et al. Reverse saturable absorption in chlorophyll A solutions. Appl Phys B 74, 559–561 (2002). https://doi.org/10.1007/s003400200844
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DOI: https://doi.org/10.1007/s003400200844