Fig. 1. Measurement principle of intensity autocorrelation and two-dimensional electric field autocorrelation based on Michelson interferometer

Fig. 2. Intensity autocorrelation measurement data of femtosecond pulse

Fig. 3. Two-dimensional electric field autocorrelation measurement results for arm-movable delay pulse and arm-fixed pulse under different time delays

Fig. 4. Spectral measurement of pulsed laser. (a) Two-dimensional autocorrelation image at zero time delay and coordinate position (790,550); (b) intensity variance at coordinate position (790, 550) and Fourier function fitting curve