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Influence of the fraction of absorbed pump power on the performance of Nd3+:YVO4 powder random lasers
Author(s): Niklaus U. Wetter; Danilo A. A. da Silva; Ernesto Jimenez-Villar; Julia M. Giehl
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Paper Abstract

Understanding light absorption in random lasers and its distribution within the scattering gain media is a key issue to increase the lasers’ efficiency. Here we compare monodispersed and polydispersed powders of Nd3+:YVO4 and investigate the influence of the powder size distribution on scattering mean free path, absorption volume and, eventually, the lasers efficiency. The highest efficiency is achieved for polydispersed powders and we conjecture that these polydispersed powders, composed of pockets containing small grains trapped between large particles, present locally higher pump power densities than the monodispersed powders. We establish a figure of merit, based on measurable powder parameters, that agrees well with the obtained output power results of the monodispersed and polydispersed samples.

Paper Details

Date Published: 22 February 2018
PDF: 8 pages
Proc. SPIE 10528, Optical Components and Materials XV, 105281U (22 February 2018); doi: 10.1117/12.2290674
Show Author Affiliations
Niklaus U. Wetter, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Danilo A. A. da Silva, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Ernesto Jimenez-Villar, Instituto de Pesquisas Energéticas e Nucleares (Brazil)
Julia M. Giehl, Instituto de Pesquisas Energéticas e Nucleares (Brazil)

Published in SPIE Proceedings Vol. 10528:
Optical Components and Materials XV
Shibin Jiang; Michel J. F. Digonnet, Editor(s)

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