Numerical simulation for the characteristics of spectral interferometry between two linear chirped pulses
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摘要: 为了研究宽带脉冲因受外界瞬态扰动而引起的相移随频谱变化的规律,利用啁啾脉冲与扰动在频域上的卷积特性,采取将频谱干涉技术和线性啁啾脉冲相结合,当两束线性啁啾脉冲在频率域相遇时,相同的频谱成分产生干涉,从其干涉图中得到随脉冲频谱变化的相对相移。根据傅里叶变换的频谱干涉技术,对从两束线性啁啾脉冲的频谱干涉图中提取相移进行了数值模拟。结果表明,对假设具有不同类型的相移进行重构,还原出随频谱变化的相位扰动。这一结果对超快光学中的瞬态测量是有帮助的。Abstract: The spectral phase shift of broadband pulse caused by transient random disturbance was investigated,based on the combination of the characteristics of linear chirped pulse and the spectral interferometry of two pulses.When the same component of both the pulse spectra meet on the frequency domain,the spectral interference is generated.Extracting spectral phase difference between both the linear chirped pulses from the spectral interferogram,it was simulated based on Fourier transform spectral interferometry(FTSI).The results show that reconstructed phase shift of chirped pulses is characteristic of spectral change,and this reconstruction algorithm is effective.This method is helpful to transient measurement of some physical quantity in ultrafast optics.
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Keywords:
- ultrafast optics /
- spectral phase shifts /
- spectral interferometry /
- chirped pulse /
- Filter /
- time delay
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