超高斯光脉冲自相关特性

采用数值分析方法研究了超高斯光脉冲的自相关特性及其受锐度参量、线性啁啾参量、噪声脉冲和随机噪声影响的变化规律,并与原脉冲相应参量作了比较,给出了一个有效的滤除随机噪声方法,并用实验作了验证。当锐度参量增加时,强度自相关曲线宽度变窄,自相关频谱曲线随之展宽。当啁啾参量增大时,光脉冲强度自相关曲线和脉冲时域波均保持不变;光脉冲的频谱曲线展宽,边缘出现振荡结构并随之增强,自相关频谱曲线随之展宽,边缘依旧平滑。存在噪声的情况下,超高斯脉冲自相关特性变化比较复杂。

Autocorrelation Characteristics of Super-Gaussian Optical Pulse

The autocorrelation characteristics of the super-Gaussian optical pulse and their variations with the edge sharpness parameter, linear chirp parameter, noise-pulse and random noise are investigated by use of numerical analysis method, and compared with the relevant parameters of the original pulse. A useful method of filtering random noise is given and validated by experiments. When the edge sharpness parameter increases, the curve of intensity autocorrelation becomes narrow, and the autocorrelation spectral curve broadens without chirp, noise-pulse and random noise. When the linear chirp parameter increases, the temporal waveform of the pulse and the curve of intensity autocorrelation keep unchanged; the curve of pulse spectra broadens and the oscillatory structures appear at its edges and increase; the autocorrelation spectral curve broadens and its edges are still smooth. The variation of pulse autocorrelation characteristics is complex when noise-pulse or random noise exists.