WETTER, N.U.GIEHL, J.M.BUTZBACH, F.ANACLETO, D.SIMONE, G. deJIMENEZ-VILLAR, E.2017-10-232017-10-23WETTER, N.U.; GIEHL, J.M.; BUTZBACH, F.; ANACLETO, D.; SIMONE, G. de; JIMENEZ-VILLAR, E. Optimized grain size distributions for maximum efficiency in neodymium doped powder random lasers. In: INTERNATIONAL CONFERENCE OF NANOPHOTONICS, 10th, July 02-05, 2017, Recife, PE. <b>Abstract...</b> p. 3-3. Disponível em: http://repositorio.ipen.br/handle/123456789/27941.http://repositorio.ipen.br/handle/123456789/27941We 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.3-3openAccessdoped materialsneodymiumpowderslasersneodymium lasersrandomnessbackscatteringgrain sizeResumo de eventos científicoshttps://orcid.org/0000-0002-9379-9530