Polydispersed powders (Nd3+:YVO4) for ultra efficient random lasers
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2018
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BRAZILIAN MRS MEETING, 17th
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Resumo
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 and cancer detectin, however, they require improvements
specifically in terms of efficiency. This talk 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. In order to 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, measurements of backscattering cone, sample
absorption, reflection and laser emission are done. 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% Nd:YVO4 crystal with
mean particle size of 54 micrometers.
Como referenciar
WETTER, NIKLAUS U.; GIEHL, JULIA M.; JIMENEZ-VILLAR, ERNESTO; ANACLETO, DANILO. Polydispersed powders (Nd3+:YVO4) for ultra efficient random lasers. In: BRAZILIAN MRS MEETING, 17th, September 16-20, 2018, Natal, RN. Abstract... São Carlos: Aptor Software, 2018. p. 26-26. Disponível em: http://repositorio.ipen.br/handle/123456789/29741. Acesso em: 19 Apr 2024.
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.