线性啁啾脉冲频谱干涉特性的模拟研究

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。

Numerical simulation for the characteristics of spectral interferometry by linear chirped pulse

The spectral phase shifts of broadband pulse caused by transient random disturbance is investigated, based on the combination of the character of linear chirped pulse and the spectral interferometry of two pulses. When same component of two pulse spectrum meet on the frequency domain, the spectral interference is generated. Extracting spectral phase differences between two linear chirped pulse from the spectral interferogram is simulated in this paper based on Fourier Transform Spectral Interferometry. The results show that reconstructed phase shifts of chirped pulse 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.