Appl Opt. 2023 Apr 10;62(11):2862-2868. doi: 10.1364/AO.484683.
A method to realize an equal-intensity beam splitter (EIBS) using wire grid polarizers (WGPs) is proposed. The EIBS consists of WGPs with predetermined orientations and high-reflectivity mirrors. We demonstrated the generation of three laser sub-beams (LSBs) with equivalent intensities using EIBS. The three LSBs were incoherent by introducing optical path differences larger than the laser coherence length. The LSBs were used to reduce speckle passively, where the objective speckle contrast was reduced from 0.82 to 0.5 when all three LSBs were used. The feasibility of EIBS in speckle reduction was studied using a simplified laser projection system. The structure of the EIBS implemented by WGPs is simpler than EIBSs obtained by other methods.
提出了一种使用线栅偏振器（Wire Grid Polarizers，简称 WGPs）实现等强度光束分光器（Equal-Intensity Beam Splitter，简称 EIBS）的方法。该 EIBS 由具有预定取向和高反射率的 WGPs 组成。我们演示了使用 EIBS 产生三个具有等效强度的激光子光束（Laser Sub-Beams，简称 LSBs）。通过引入大于激光相干长度的光程差，使三个 LSBs 成为非相干光。LSBs 被用于被动地降低散斑，当使用所有三个 LSBs 时，目标散斑对比度从 0.82 降低到 0.5。使用简化的激光投影系统研究了 EIBS 在散斑降低中的可行性。由 WGPs 实现的 EIBS 结构比通过其他方法获得的 EIBS 更简单。
