Synthesis of narrow bandwidth flat-top ns pulse with multi-ultra-short pulses

Making use of the spectral narrowing of ultra-short pulses subject to amplification in the gain bandwidth media, a multi-ultra-short pulse coherent synthesizer (MUSPCS) developed from the traditional regenerative amplifier is proposed, and its operational principle is described. In the small signal gain regime, the theoretical analysis and numerical simulation on the MUSPCS have been made. The simulation results show that the narrow bandwidth flat-top long pulse can be composed if the parameters were controlled carefully.