In this paper, we propose a measurement system based on single autocorrelation technology and combined with LabVIEW software platform to realize the real-time online measurement of the femtosecond-laser pulse width. The system uses an experimental device based on the Mach–Zehnder interferometer, where the second-harmonic signal of femtosecond laser is obtained by the nonlinear effect of light and nonlinear material; the linear grayscale conversion, median filtering, and threshold segmentation are also applied to the second-harmonic signal. The image centroid, autocorrelation curve, and femtosecond-laser pulse width are obtained, using LabVIEW software. In the experiment, a seed laser source with a central wavelength of 800 nm is used as a test object, and the pulse width is measured to be equal to 261 fs.

本文提出了一种基于单一自相关技术并结合LabVIEW软件平台的测量系统，以实现飞秒激光脉冲宽度的实时在线测量。该系统使用基于Mach–Zehnder干涉仪的实验设备，其中飞秒激光的二次谐波信号是通过光和非线性材料的非线性效应获得的；线性灰度转换，中值滤波和阈值分割也应用于二次谐波信号。使用LabVIEW软件获得图像质心，自相关曲线和飞秒激光脉冲宽度。在实验中，将中心波长为800 nm的种子激光源用作测试对象，并测量脉冲宽度等于261 fs。