两种光谱相位相干电场重构法对复杂脉冲测量的准确度比较

Comparison of accuracy between two spectral phase interferometric methods in the characterization of complex pulses

借助数值模拟的方法,比较了传统的光谱相位相干直接电场重构(SPIDER)法和延时受控无条纹光谱相位相干电场重构(DCFF-SPIDER)法对复杂脉冲测量准确度的差异,并分析其内在的原因.理论计算表明,传统SPIDER方法在测量光谱和相位结构存在突变的复杂脉冲时,通常会出现一定程度的偏差,而DCFF-SPIDER方法能够保持很高的准确度.

By means of numerical simulation, a comparison is made between conventional spectral phase interferometry for direct electric-field reconstruction （SPIDER） and delay-controlled fringe-free SPIDER （DCFF-SPIDER） in the accuracy of characterization of complex pulses. The results show that errors occur likely when complex pulses with abrupt variations in spectra or/and phases are characterized with conventional SPIDER, while DCFF-SPIDER can give high accuracy. The underlying reasons for this difference are discussed.