Abstract

The saturable optical absorption properties of PbSe core nanocrystals (NCs), and their corresponding PbSePbS coreshell and PbSePbSexS1-x core∕alloyed-shell NCs, were examined at λ=1.54μm. Saturation intensities of approximately 100MWcm2 were obtained. The NCs act as passive Q switches in near-infrared pulsed lasers. Q-switched output pulse energies up to 3   mJ, 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 10  ns long, the NCs act as fast saturable absorbers. The theoretical fits yield a ground-state absorption cross section of 10161015cm2, an excited-state absorption cross section of σes1016cm2, and an effective lifetime of τeff5×1012  s.

© 2006 Optical Society of America

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