title: Optical limiting of pentaazadentate metal complexes for picosecond pulses in solution.
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/T0 = 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.
authors: Laboratory of Photochemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
authors: F
authors: F
authors: Guo
authors: W
authors: W
authors: Sun
authors: D
authors: D
authors: Wang
authors: L
authors: L
authors: Zhao
authors: Z
authors: Z
authors: Lu
authors: Y
authors: Y
authors: Nie