18 August 2005 Synthesis, characterization and the use of PbSe/PbS and PbSe/PbSexS1-x core-shell nanocrystals as saturable absorbers in passively switched near infra-red lasers
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Abstract
The saturable absorbing properties of PbSe core nanocrystals (NCs), and their corresponding PbSe/PbS core-shell and PbSe/PbSeS core-alloyed shell NCs, were examined at an energy of 1.54 micron. These NCs act as an efficient passive Q-switch in near infra-red pulsed lasers. Saturation fluence values in the order of a few hundreds mJ/cm2 were obtained, leading to a laser power output of 2.0-3.5 mJ with a pulse duration of 40-53 nsec. We demonstrated a substantial increase of the emission quantum yield and a slight decrease of the saturation fluence values, when using PbSe/PbS and PbSe/PbSexS1-x core-shells structures, in comparison with the corresponding PbSe core NCs. A quasi-three level energy manifold was used for the simulation of saturation fluence curves and of the absorption cross sections. All samples were prepared in a novel colloidal synthetic method.
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A. Kigel, A. Kigel, M. Brumer, M. Brumer, A. Sashchiuk, A. Sashchiuk, M. Sirota, M. Sirota, E. Galun, E. Galun, E. Lifshitz, E. Lifshitz, "Synthesis, characterization and the use of PbSe/PbS and PbSe/PbSexS1-x core-shell nanocrystals as saturable absorbers in passively switched near infra-red lasers", Proc. SPIE 5929, Physical Chemistry of Interfaces and Nanomaterials IV, 59290F (18 August 2005); doi: 10.1117/12.618902; https://doi.org/10.1117/12.618902
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