Abstract
The saturable optical absorption properties of PbSe core nanocrystals , and their corresponding and core∕alloyed-shell , were examined at . Saturation intensities of approximately were obtained. The act as passive Q switches in near-infrared pulsed lasers. Q-switched output pulse energies up to , with a pulse duration of 40–55 ns were demonstrated. Analysis of the optical transmission versus pulse light intensity was carried out according to a model that includes ground-state as well as excited-state absorption. For pulses long, the act as fast saturable absorbers. The theoretical fits yield a ground-state absorption cross section of , an excited-state absorption cross section of , and an effective lifetime of .
© 2006 Optical Society of America
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