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(Color online) Laser emission spectrum is shown by solid line and empty circles show the collected emission when the laser is almost completely shut off by the gating pulse. The inset on the top left shows the experimental setup: two different beams, pump at and gate at , are sent onto the device with a small incident angle. The inset on the top right shows an AFM image of DFB structure.
(Color online) (a) Temporal evolution of population during laser action measured by pump-probe technique (triangles). Solid line is the fit obtained with a coupled rate equations model. Circles show the population decay due to stimulated emission outside the grating and dotted line represents the laser output pulse obtained by numerical model. (b) Graphic description of the numerical model (see text). (c) Switching efficiency curve experimentally measured is plotted in line with circles. Solid line with triangles shows the simulation of switching efficiency effect neglecting the role of charge generation. Solid line with squares shows the fit obtained considering defects in the polymer, implying a variation of losses from region to region. Solid line with crosses shows the fit obtained supposing spatial inhomogeneities of the pump beam adding to the former effect.
(Color online) (a) Simulations of switching efficiency curve taking into account a variation of losses inside the polymer, as obtained by changing : a decrease in implies an increase of losses to which it corresponds an increase of buildup time and duration of laser pulse and consequently a significant switching effect even for further delays. (b) Simulations of switching efficiency curve upon increasing the pump intensity. A linear combination of different curves provides the fit shown in Fig. 2(c).
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