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.
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M. Anni (2011) studied this question.
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