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基于飞秒脉冲相关干涉项含有脉冲的相位和频率信息,测量自相关二次谐波干涉条纹可见的振荡频率为ωτ及2ωτ两个谱分量的大小和形状,以及二次干涉自相关函数包络面积的大小和形状,可以得到飞秒激光脉冲啁啾大小的信息。另外,通过对二次干涉自相关(IAC)迹线求一阶导数得到的干涉自相关导数光谱(D-MOSAIC)的峰谷与啁啾正负对应关系,找到了判定啁啾正负的方向因子即正弦函数因子,据此能够判断飞秒激光脉冲啁啾的正负。因此,采用能够满足光学相干探测基本条件的测量系统,利用二阶干涉自相关法可以用来检测飞秒脉冲激光的啁啾特性。
Based on the information about the phase and frequency of the pulse in the femtosecond pulse-related interference term, the oscillation frequency of the second harmonic interference fringes can be measured as the size and shape of the two spectral components ωτ and 2ωτ, as well as the quadratic interference autocorrelation function envelope The size and shape of the area gives information on the chirp size of the femtosecond laser pulse. In addition, we found the positive and negative directions of the chirp by finding the corresponding relationship between the peak and valley of the interference autocorrelation derivative spectrum (D-MOSAIC) derived from the first-order derivative of the second interference auto-correlation (IAC) trace and the chirp The factor is the sine function factor, from which the positive and negative of the femtosecond laser pulse chirp can be judged. Therefore, using the measurement system which can meet the basic conditions of optical coherent detection, the second-order interference auto-correlation method can be used to detect the chirp characteristics of femtosecond pulsed laser.