The Influence of High Order Dispersions in a Downchirped Pulse Amplification Femtosecond Laser System and Optimization of the Pulse Width

Abstract

We investigated the influence of group delay dispersion, third order dispersion, and fourth order dispersion on femtosecond pulses by using the energy concentration and the Strehl ratio. The dispersion optimization imposed by each specific amount of high order dispersion for various spectra were found. In the case of our downchirped pulse amplification (DPA) system, the energy concentration increased by as much as 12 percent. The Strehl ratio also rose to as much as 0.76 when we utilized the amplified spectrum. Based on the results, a multi-GW DPA femtosecond laser system with a high-repetition rate is under construction.