基于可调超表面的激光散斑抑制方法

Laser Speckle Suppression Based on Tunable Metasurface

为抑制激光散斑现象,利用时间平均抑制散斑理论的基本思想,设计了一个具有高透射率、随机相位功能的超表面结构,并结合MEMS技术实现了微纳旋转载台的设计制造,实现了超小型的散斑抑制器件制造.实验结果显示激光散斑对比度可降低至2.63%,满足激光投影领域使用需求.该激光散斑抑制器件使用方法简单、能量利用率高、成本低且易于批量制造.

In order to suppress laser speckle,a metasurface structure with high transmittance and random phase function is designed,which utilizing the basic idea of time-averaged suppression speckle theory.Then integrated with MEMS technology,the design and manufacture of micro-rotation stages is realized,and to achieve a ultra-small speckle suppression device.The experimental results show that the laser speckle contrast can be reduced to 2.63%,which meets the needs of laser projection.This novel laser speckle suppression device is simple in use,high in energy utilization rate,low in cost,and easy to massproduce.