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Polymer DFB laser emission (full squares) and polymer film emission (empty circles) as a function of the pump energy. The solid lines are linear fit to experimental data. Inset: DFB emission spectra below (dashed line) and above (continuous line) laser threshold.
(Color online) Temporal evolution of the normalized transient transmission changes at probe wavelength, on the DFB device under lasing operation (circles) and out of the device (crosses), for pump fluences of 600 and of , respectively. The solid line is the fitting curve and the dashed line is the normalized output pulse obtained from the model . Inset: scheme of the experiment.
Photon lifetime in the cavity as a function of the pump energy (full circles) obtained from the fittings and corresponding pulse duration (empty circles). The dashed line is the fit according to dependence. Inset: normalized transient transmission changes for different pump energies (triangles: , squares: , and circles: ) and corresponding best fits.
Logarithmic losses as a function of the DFB length and linear fit to experimental data (dashed line).
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