Regenerative Shaper of Ultrashort Light Pulses

In this article, we propose and demonstrate an ultrashort light pulse regenerative shaper based on a closed-loop double-stage Mamyshev regenerator with an electrically controllable acousto-optic switch. This setup allowed us to apply an initial pulse from an external pulse source and to reshape the pulse to an ultrashort, high-quality, compressible one, the parameters of which were determined by the parameters of the regenerative circuit (RC), due to repeated pulse round-trips in the closed-loop RC. It was found that after 3-7 round-trips the energy of the regenerated pulse was almost independent of the energy of the initial pulse. However, at least 20 round-trips in the RC were required to shape the steady repetitive pulse. In addition, we demonstrated, both experientially and numerically, that the generation of periodic pulse sequences with limited pump power can lead to a rearrangement of the pulse sequences, which results in variations in the length of the pulse sequence from period to period.

Automated summary

In this article, an ultrashort light pulse regenerative shaper based on a closed-loop double-stage Mamyshev regenerator with an electrically controllable acousto-optic switch is proposed and demonstrated. The reshaping of the initial pulse to an ultrashort, high-quality, compressible pulse is achieved through repeated pulses round-trips in the closed-loop regenerative circuit (RC). It was found that the energy of the regenerated pulse became independent of the energy of the initial pulse after 3-7 round-trips, while at least 20 round-trips were required to shape the steady repetitive pulse.