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Optical amplification of a weak 536 nm signal after passing through the polymer amplifier: (a) weak input signal, (b) amplified output signal, and (c) polymer emission noise.
Amplifier gain as a function of wavelength for a range of polymer concentrations: 1.5 mg/ml (open triangles), 3 mg/ml (filled triangles), 3.5 mg/ml (filled squares), and 5 mg/ml (filled diamonds). The spectral variation of the steady-state polymer photoluminescence (solid line) is also shown: this spectral range covers only a fraction of the full emission width.
Gain saturation at 543 nm: Amplifier gain as a function of input signal energy (filled circles). The experimental data are plotted together with a fit to Eq. (1) (solid line). Also shown is the gain dependence on the output signal energy (filled squares): The corresponding saturation energy of the amplifier is indicated by the vertical dashed line. The chemical structure of F8BT is presented in the inset.
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