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Random lasing by nanostars. (a) Emission spectra of the free R6G dye solution at different excitation fluences (100 ms acquisition time). (b) Integrated emission intensity as a function of the excitation fluence for free R6G dye. (c) Emission spectra of the R6G dye/nanostar suspension at different excitation fluences. (d) Integrated emission intensity as a function of the excitation fluence for the R6G dye/nanostar suspension.
