Nonlinear chirp waveform optimization for obtaining ultra-short attosecond pulses

Abstract:

By regulating the nonlinear chirp waveforms, a method to extend the harmonic cutoff and enhance the harmonic intensity by combining two kinds of nonlinear chirp forms has been proposed. The results show that by appropriately adjusting the second-order and third-order chirp parameters, the chirp delays and the other laser parameters of the combined pulse, the laser waveforms can be optimized. Driven by the optimal waveforms, the harmonic cutoff and harmonic radiation intensity can be significantly increased, which can lead to the generation of the isolated pulses with the durations of 39 as.