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Schematic of the polymer amplifier.
Gain dependence on pump energy density for a signal wavelength for two waveguide lengths (622 and ). The inset shows variation of gain with signal energy coupled into a waveguide length of with the pump energy density fixed at . The solid line is a fit to gain saturation in a pulsed amplifier.
Maximum gain per millimeter (square solid symbols), gain cross section (circular open symbols), absorbance (dotted line), and stimulated emission spectra (solid line). The intensity of the latter was calculated by multiplying the spontaneous emission spectrum by .
Gain vs time delay between pump and signal pulses (symbols) in a long waveguide. The solid lines show a fit for exciton-exciton annihilation.
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