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(Color online) (a) Schematic of the setup. (b) Schematic of polymer amplifier. (c) Absorbance (solid symbols), photoluminescence (open symbols), amplified spontaneous emission (dot-dash line) spectra of F8BT, and signal spectra (line). Arrow shows the position of the pump pulse.
Streak camera traces of amplified (dash line) and nonamplified pulses (solid line). The pump energy density is and the signal energy was in a waveguide length of .
Gain dependence on pump energy density for signal pulses delayed by 10, 70, and with respect to the pump pulse on two waveguide lengths of 1022 and .
Gain dependence on signal energy for signal pulses delayed by 10, 70, and with respect to the pump pulse in a long waveguide (symbols) and the theoretical fit (dash lines). The pump energy density was kept constant at . Signal energy was calculated from input pulse energy taking into account a 20% light coupling efficiency into waveguide which corresponds to the value just after the input grating.
Gain obtained for signal pulses at different time delays for a waveguide length of . The symbols show time dependence for three signal pulses. Pump energy densities are 2.6 (open symbols) and (solid symbols) using a signal energy of . The solid line shows the time dependence for a single signal pulse with a pump energy density of , measured using a lock-in detection for which a higher signal energy had to be used , which resulted in a lower gain. The dotted lines are a guide for the eye.
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