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(Color online) Room-temperature amplified spontaneous emission spectra at low and high injection currents as indicated. The two spectra for undoped and -doped devices correspond to the same modal gain and have been normalized to the GS emission for comparison. Curves are shifted vertically for clarity. The spectrum of the laser pulse used in the experiment is also shown.
(Color online) Pump-induced transmission change of the ground-state transition at in the -doped QD amplifier. Data (dotted lines) together with fits (solid lines) are shown in the absorption and gain regimes as indicated. The time constants deduced from a multiexponential fit are also indicated.
(Color online) Pump-induced modal gain change after deconvolution with the pulse intensity autocorrelation. A comparison between the samples for the same pump intensity and the same small-signal modal gain is shown in the absorption and gain regimes.
(Color online) Pump-induced modal gain change after pump-probe delay as a function of the small-signal gain. In the inset, the ES and GS small-signal gains are shown vs injection current in units of GS transparency current , this latter being 2.4 and for the undoped and -doped samples, respectively. Symbols highlight the ES gain at GS gain.
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