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1 December 1997 Stimulated emission, lasing, and line narrowing in conjugated polymers
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We present time-resolved and time-integrated measurements of optical gain and its effects in films and microcavities made from poly(p-phenylenevinylene) (PPV). We demonstrate that PPV films yield net gain due to stimulated emission with a lifetime of about 20 ps when excited with 200 fs pulses. The short duration of this gain is shown to result from exciton- exciton annihilation. We present results showing how this gain leads to spectral narrowing of the emission from PPV films and discuss why it is unlikely cooperative phenomena play a role in this phenomenon. We present evidence that it results from waveguiding of amplified spontaneous emission. Newly developed high-finesse microcavities are described, for which it is possible to obtain lasing thresholds below the onset of exciton-exciton annihilation. We present measurements of the far-field emission patterns from these structures and also demonstrate a measurement of the coherence time of their emission.
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Graham J. Denton, Nir Tessler, Mark A. Stevens, Seamus E. Burns, Nick T. Harrison, and Richard H. Friend "Stimulated emission, lasing, and line narrowing in conjugated polymers", Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997);

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