非线性啁啾波形优化获得超短阿秒脉冲

Nonlinear chirp waveform optimization for obtaining ultra-short attosecond pulses

摘要:

本文通过调控非线性啁啾波形，提出了运用两种非线性啁啾组合波形延伸谐波截止能量以及增强谐波强度的方法. 研究结果表明，适当调节组合场的二阶和三阶啁啾参数、啁啾延迟以及其它激光参数后，激光波形得到最佳优化. 在最佳波形驱动下，谐波截止能量和辐射强度明显增大，进而我们可以获得脉宽在39 as的孤立脉冲.

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.