We study optical gain and laser emission from semiconducting conjugated polymers after strongoptical excitation with femtosecond laser pulses. Stimulated emission from few-hundred-nanometerthin films results in a sharp increase in emission intensity and emission line narrowing. Very largeoptical gain due to the stimulated emission is measured directly by pump-probe spectroscopy. Usingthe large light amplification in these conjugated polymers, we demonstrated planar and ring lasers ofvery small sizes that are suitable for applications in integrated optics. Vertical cavity surface emittinglasers, distributed feedback through surface relief grating, and whispering-gallery mode emissionfrom ring resonators are demonstrated.
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