GIORDANO BRUNO CREPALDI DE SIMONE
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Resumo IPEN-doc 23251 Optimized grain size distributions for maximum efficiency in neodymium doped powder random lasers2017 - WETTER, N.U.; GIEHL, J.M.; BUTZBACH, F.; ANACLETO, D.; SIMONE, G. de; JIMENEZ-VILLAR, E.We show that polydispersed powders can have much higher random laser output power and efficiency than monodispersed powders. A more than 50% slope efficiency is achieved by using highly doped Nd:YVO4 powders composed of average grains size of 50 μm and 10% volume fraction of grains below 1 μm. We demonstrate that the smaller particles, trapped between large particles, serve as gain centers whereas the large particles control the light diffusion into the sample. A detailed light diffusion analysis of the samples explains the observed differences.