Abstract

The recent demonstration of emission spectral narrowing in π-conjugated polymer films,^1-8 has stirred widespread interest to the phenomenon of laser-action in these materials. It is now generally believed that spectral narrowing in superior polymer films is caused by amplified spontaneous emission (i.e. single pass stimulated emission (SE)) enhanced by the optical waveguiding in the film.^2-8 However, the femtosecond exciton dynamics under SE conditions, and the effects of exciton inhomogeneity in the films on the properties of the SE and its dynamics have not been investigated.

© 1999 Optical Society of America