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Multimode laser emission is observed in a polymer optical fiber doped with a mixtnre of Rhodamine 60 (Rh 60) and Uhodamine B (Rh B) dyes. Tuning oflaser emission is achieved by using the mixture of dyes due to the energy transfer occurring from donor molecule (Rh 6G) to acceptor molecule (Rh B). The dye doped poly(methyl methacrylate}based polymer optical flber is pumped axially at one end of the fiber using a 532 nrn pulsed laser beam from a Nd:YAG laser and the fluorescence emission isdoi:10.1364/ao.46.008089 pmid:18026548 fatcat:lelc3dbouvh4bjfoml4ibmipv4