提出并实验研究了采用旋转中空角体棱镜作为光学延迟器的二阶实时光学自相关器。用于飞秒锁模掺钛蓝宝石激光器输出的脉冲测试表明,该相关器运转稳定、可靠。提出了用计算机对所测相关曲线进行误差补偿的概念。 A second-order real-time optical autocorrelator using a rotating hollow prismatic prism as an optical retarder is proposed and experimentally studied. The pulse test for femtosecond mode-locked titanium-doped sapphire laser output shows that the correlator operates stably and reliably. The concept of using the computer to compensate the measured correlation curve is proposed.