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利用啁啾脉冲的频域干涉测量技术,可实现对超快光学瞬态过程的单发诊断,此方法的时间分辨率和单发时间测量范围分别与啁啾脉冲的谱宽和脉冲宽度及光谱仪的工作性能有关。当两束线性啁啾脉冲进入光谱仪后,相同的频谱成分会发生干涉形成频谱干涉条纹,如果其中一束脉冲受到外界扰动的影响,可根据干涉条纹的形状重构出扰动的具体形式。理论研究和数值模拟了由频谱干涉图重构外界附加扰动的过程,模拟结果显示重构出的扰动同附加的真实扰动符合得较好;在频谱记录面有限的情况下,重构出的扰动信号带有强烈的振荡,通过平滑处理有效地抑制了振荡。
The frequency-domain interferometry technique using chirped pulse can realize the single-shot diagnosis of ultra-fast optical transient process. The time resolution and single-shot time range of this method are related to the spectral width and pulse width of the chirped pulse and the spectrometer The performance of the job. When two linearly chirped pulses enter the spectrometer, the same spectral components interfere with each other to form spectral interference fringes. If one of the pulses is affected by external disturbances, the specific form of the disturbance can be reconstructed according to the shape of the interference fringes. Theoretical studies and numerical simulations of the process of reconstructing the external perturbations from the spectrum interferograms show that the reconstructed perturbations are in good agreement with the additional real perturbations. In the case of limited spectrum recordings, the reconstructed disturbances The signal has a strong oscillation, which is effectively suppressed by smoothing.