We report single-pass optical gain measurement in polystyrene!
waveguides doped with stilbenoid
and phenylene vinylene derivative model compounds under picosecond excitation. Using a
wavelength dependent model of amplified spontaneous emission, we produce optical gain spectra
for these materials. Net optical gains of
g
5
15? 20 cm
2
1
are deduced. The spectra also exhibit
features consistent with excited state absorption and fluorescence depletion via stimulated emission.
A figure of merit describing the potential of a material for use as a laser medium is presented and
comparisons with other recent publications are made. This comparison indicates that organic
materials can compete with inorganic semiconductors for optically pumped applications.
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