Polydispersed powders (Nd3+:YVO4) for ultra efficient random lasers
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Particle and Particle Systems Characterization
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Random lasers hold the potential for cheap, coherent light sources that can
be miniaturized and molded into any shape with several other added benefits
such as speckle-free imaging; however, they require improvements specifically
in terms of efficiency. This paper details for the first time a strategy for
increasing the efficiency of a random laser that consists in using smaller particles,
trapped between large particles to serve as absorption and gain centers
whereas the large particles control mainly the light diffusion into the sample.
Measurements of backscattering cone, sample absorption, reflection, and
laser emission are used to determine the samples’ transport mean free path,
fill fractions, laser efficiency, and the average photon path lengths inside the
scattering medium for backscattered pump photons. A record slope efficiency
of 50% is reached by optimizing pump photon diffusion and absorption in a
powder pellet composed by a polydispersed particle size distribution (smaller
particles between bigger ones) from a grinded and sieved 1.33 mol% yttrium
vanadate doped with neodymium crystal with mean particle size of 54 μm.
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WETTER, NIKLAUS U.; GIEHL, JULIA M.; BUTZBACH, FELIX; ANACLETO, DANILO; JIMENEZ-VILLAR, ERNESTO. Polydispersed powders (Nd3+:YVO4) for ultra efficient random lasers. Particle and Particle Systems Characterization, v. 35, n. 4, p. 1700335-1 - 1700335-10, 2018. DOI: 10.1002/ppsc.201700335. Disponível em: http://repositorio.ipen.br/handle/123456789/28540. Acesso em: 24 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.