Abstract
Picosecond measurements of the optical response of chloroaluminum phthalocyanine in solutions are presented. The observed nonlinearities are modeled and interpreted theoretically by rate-equation and density-matrix techniques within a three-level model. Single-pulse power limiting is observed at 532 nm, and the absorption cross section of the first excited state is determined to be 15 times that of the ground state. From time-resolved excitation–probe measurements we determine an excited-state recombination time of 7 ns and a reorientational time of 7 ps. Further, the observation of the associated optical coherence effects, which are manifested as a negative coherent artifact, allow us to obtain an 8ps coherence time.
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