Pre-chirp managed divided-pulse amplification using composite birefringent plates for pulse division and recombination: en route toward GW peak power.

Abstract

Pre-chirp managed amplification (PCMA) allows the generation of optical pulses with a duration well below 100 fs. However, the pulse peak power is limited to <50 MW due to poor energy scalability. In this paper, we combine PCMA and divided pulse amplification to overcome this bottleneck. The resulting pre-chirp managed divided-pulse amplification (PCM-DPA) employs birefringent plates as the pulse divider/recombiner thanks to the picosecond pulse duration in the amplifier. Our numerical analysis shows that the group-delay dispersion (GDD) difference among pulse replicas results in reduced combining efficiency with increased replica numbers. We propose using composite birefringent plates to construct the divider/recombiner that features negligible GDD-difference. An Yb-fiber PCM-DPA system incorporating such composite-plate based divider/recombiner for 64 replicas can produce 121-µJ, 44-fs pulses with 2.3-GW peak power. To have a compact system, we further propose a hybrid design which can deliver 61-µJ, 48-fs pulses with 1.13-GW peak power. These results represent >30 times improvement in both pulse energy and peak power compared with current Yb-fiber PCMA systems.