Abstract
The amplification of ps and fs pulses with peak powers of up to 4.5kW has been investigated in a single quantum well InGaAs tapered amplifier. The pulses with durations of 100fs or 2ps were generated by a modelocked titanium–sapphire laser. The amplified pulses indicate strong gain saturation and carrier generation due to photon absorption in the laser active region which causes a temporal broadening of the amplified pulses as well as modifications of the optical spectrum. The gain recovery time was measured by a pump–probe experiment. The experimental results are analyzed with respect to the sub-ps gain dynamics which is described by a relaxation time approximation.
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