We report on a flexible coherent random laser based on poly(9,9-dioctylfluorene) (PF8) deposited on a surface corrugated poly-phthalate-carbonate (PPC) substrate. We show that the feedback for lasing is due to a combination between the scattering at the rough PF8-PPC interface and the scattering at the PF8-air interface, due to PF8 thickness fluctuations. (C) 2011 American Institute of Physics. [doi:10.1063/1.3601854]
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