频谱宽度对超短脉冲光束的影响

利用理论推导和数值模拟的方法对超短脉冲光束的空间奇异性问题进行了较为深入的研究,给出了超短脉冲光束是否需要使用复解析信号理论的条件,并通过对超短高斯脉冲光束的频谱分析,直观形象地看到了空间奇异性产生的根源,还对比了超短无啁啾和啁啾高斯脉冲光束的频谱差异,说明了超短脉冲光束的空间奇异性主要是由频谱宽度引起的。

Influence of the spectrum width on the ultrashort pulsed beams

The paper discusses the spatial singularity of the ultrashort pulsed beams in theory by use of the simulation.It proposes the condition under which the complex analytical signal is used or not.The original reason of the spatial singularity could be found easily by analyzing the spectrum width of ultrashort Gaussian pulsed beams.Comparing the spectrum widths of the ultrashort unchirped with chirped Gaussian pulsed beams,the paper shows that the broad spectrum width of the ultrashort pulsed beams is the original reason for the spatial singularity.