散斑现象严重影响激光投影的图像质量，必须加以抑制。在已有研究的基础上，提出一种基于振动混光棒的散斑抑制方法，介绍了相关理论，并通过仿真和实验验证了该方法的有效性。基于两种典型激光光源的实验结果证明：该方法无需额外整形透镜光学器件即可实现高效整形照明，缩小了系统尺寸；所得投影图像的散斑对比度不大于6%，满足视觉观察的要求；消散系统的能量利用率不小于90%。

Speckle effect severely affects the laser projection image quality, therefore it needs to be suppressed. A speckle suppression method with a vibrating light pipe is proposed. It is theoretically analyzed, and the effectiveness is verified by simulations and experiments. Experiments are performed with two typical laser sources. The results show that, with the proposed method, no additional reforming lens is necessary for efficient rectangular illumination, which reduces the system size; the vibrating light pipe method can effectively reduce the speckle contrast to less than 6%, which is not recognizable to human eyes; the illumination efficiency of the speckle suppression system is above 90%.