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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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Kigel, M. Brumer, A. Sashchiuk, M. Sirota, E. Galun, and 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); https://doi.org/10.1117/12.618902
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