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

A. Kigel; M. Brumer; A. Sashchiuk; M. Sirota; E. Galun; E. Lifshitz

doi:10.1117/12.618902

18 August 2005 Synthesis, characterization and the use of PbSe/PbS and PbSe/PbSe_xS_1-x core-shell nanocrystals as saturable absorbers in passively switched near infra-red lasers

A. Kigel, M. Brumer, A. Sashchiuk, M. Sirota, E. Galun, E. Lifshitz

Author Affiliations +

Proceedings Volume 5929, Physical Chemistry of Interfaces and Nanomaterials IV; 59290F (2005) https://doi.org/10.1117/12.618902
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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/PbSe_xS_1-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, M. Brumer, A. Sashchiuk, M. Sirota, E. Galun, and E. Lifshitz "Synthesis, characterization and the use of PbSe/PbS and PbSe/PbSe_xS_1-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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