Nanosecond reverse saturable absorption in cubanelike transition-metal clusters

Abstract

We report the measurement of reverse saturable absorption in four cubanelike transition-metal clusters with nanosecond laser pulses. We also present a five-level rate-equation model in which ionization and germinate recombination are included. A comparison between the model and the measured data shows that the population of the triplet states is generated mainly through the ionization - recombination process, and triplet - triplet absorption is responsible for the measured reverse saturable absorption. © 1995 Optical Society of America.