Abstract

The optical-limiting performances for four pentaazadentate metal complexes in tetrahydrofuran have been measured at 532 nm for 35-ps pulses, in which reverse saturable absorption from the singlet–singlet excited states should be responsible for the limiting mechanism. The excited-state parameters are calculated according to a six-level model. The limiting threshold at T/ T ₀ = 0.5 is 44 mJ/cm², and the throughput is limited to 27 mJ/cm² as incident fluence reaches 0.35 J/cm² for carboxyl pentaazadentate cadmium. The limiting thresholds and the throughput values are strongly influenced by peripheral substituents and central metal ions of the complexes.

© 2001 Optical Society of America

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