线性啁啾脉冲频域-时域相移转换的模拟研究

在超快激光与物质相互作用的实验中, 实现单束实时的频谱干涉测量对提高测量精度很重要。基于频谱干涉原理和线性啁啾脉冲瞬时频率与时间的线性关系对啁啾脉冲频域相移直接映射为瞬态时域相移的原理进行了理论研究; 推导出这种频域-时域相移映射模式成立的限制条件。对相移直接映射过程进行了数值模拟和分析, 结果显示, 该方法可以得到具有瞬态特性的时域相移, 具有单束测量的能力; 在微扰和带宽一定的条件下, 增加探测脉冲的啁啾量, 可以减小频域-时域相移映射过程中产生的误差。

Simulation Investigation for Phase-Shifts Transformation of Linearly Chirped Pulse from Frequency-Domain to Time-Domain

In ultrafast laser-matter interaction experiments, single-shot, real-time spectral interferometry is the significant for rapid and accurate measurement. Based on spectral interferometry and time-frequency linear relation of linearly chirped pulse, the method that spectral phase-shifts of chirped pulse are transformed to temporal phase-shifts in a directly frequency-to-time mapping mode is investigated theoretically. Restrictive conditions of this method are derived. The transformation process of phase-shifts is simulated. The results show that phase-shifts obtained is characteristic of temporal change, and this approach has single-shot measurement ability, which in perturbation and fixed pulse bandwidth, the transformation error of phase-shifts is reduced, as appropriate increase of the chirp of probe pulse.