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Proceedings Paper

Stimulated emission, lasing, and line narrowing in conjugated polymers
Author(s): Graham J. Denton; Nir Tessler; Mark A. Stevens; Seamus E. Burns; Nick T. Harrison; Richard H. Friend
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Paper Abstract

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.

Paper Details

Date Published: 1 December 1997
PDF: 12 pages
Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.279286
Show Author Affiliations
Graham J. Denton, Univ. of Cambridge (United Kingdom)
Nir Tessler, Univ. of Cambridge (United Kingdom)
Mark A. Stevens, Univ. of Cambridge (United Kingdom)
Seamus E. Burns, Univ. of Cambridge (United Kingdom)
Nick T. Harrison, Univ. of Cambridge (United Kingdom)
Richard H. Friend, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 3145:
Optical Probes of Conjugated Polymers
Z. Valy Vardeny; Lewis J. Rothberg, Editor(s)

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