Optical gain spectra from doped polymeric waveguides

We report on single-pass optical gain measurements in poly(styrene) wavegui des doped with polymeric model compounds under picosecond excitation. Using a wavelength-dependent model of amplified spontaneous emission, we produce optical gain spectra for these materials. Large net optical gains are prod uced for small input pulse energies. A figure of merit describing the poten tial of a material for use as a laser medium is presented. Comparisons with other recent publications indicate that organic materials can compete with inorganic semiconductors for optically pumped applications. (C) 2000 Elsev ier Science S.A. All rights reserved.