IV-VI semiconductor nanocrystals for passive Q-switch in IR

Marina Sirota; Ehud Galun; Vladimir Krupkin; Alexander Glushko; Ariel Kigel; Maya Brumer; Aldona Sashchiuk; L. Amirav; Efrat Lifshitz

doi:10.1117/12.559416

14 October 2004 IV-VI semiconductor nanocrystals for passive Q-switch in IR

Marina Sirota, Ehud Galun, Vladimir Krupkin, Alexander Glushko, Ariel Kigel, Maya Brumer, Aldona Sashchiuk, L. Amirav, Efrat Lifshitz

Author Affiliations +

Proceedings Volume 5510, Nanophotonic Materials; (2004) https://doi.org/10.1117/12.559416
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

The use of semiconductor nanocrystals as a passive Q-switch in an eye-safe laser system is demonstrated. These lasers recently became popular in laser radar, three-dimensional scanning, targeting, and communication applications. Such applications require the laser to operate under Q-switching, generating a laser pulse with duration on the order of tens of nanoseconds, and a peak power on the order of a megawatt. Semiconductor nanocrystals exhibit unique physical properties, associated with the quantum size effect. The PbS and PbSe nanocrystals show a size-tunable absorption resonance in the near IR spectral region (1000-3000 nm), saturable absorbing properties, suitable as a functional Q-switch in eye-safe lasers. The quantum confinement effect and the saturable absorption can be manifested only in high quality nanocrystals with a narrow size distribution and passivated surfaces. Thus, a special synthetic procedures have been used for the preparation of PbSe core, PbSe/PbS core-shell and PbSe/PbSexS1-x core-alloyed shell nanocrystals. Then, a passively Q-switched Er:glass laser has been assembled, while the laser output energy, Q-switch threshold energies, and pulse width have been measured.

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Marina Sirota, Ehud Galun, Vladimir Krupkin, Alexander Glushko, Ariel Kigel, Maya Brumer, Aldona Sashchiuk, L. Amirav, and Efrat Lifshitz "IV-VI semiconductor nanocrystals for passive Q-switch in IR", Proc. SPIE 5510, Nanophotonic Materials, (14 October 2004); https://doi.org/10.1117/12.559416

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