Tong Zhaomin, Yan Yuxiang, Ma Yifei, Wang Mei, Jia Suotang, Chen Xuyuan
Opt Lett. 2021 Aug 15;46(16):3965-3968. doi: 10.1364/OL.431405.
An equal-intensity beam splitter (EIBS) for passive laser speckle reduction is reported. The EIBS consists of a segmented half-wave plate (SHWP) with the designed orientation of the fast axis of each segment, a polarization beam splitter, and a mirror. The SHWP is fabricated using patterned photoalignment material and liquid crystal polymer. Ten laser sub-beams are generated by the twenty-one-pixelated EIBS, where the largest intensity ratio among them is 7.6. Laser temporal and spatial coherences are destroyed because of the optical path delays among the laser sub-beams. The EIBS is used to reduce laser speckle passively, and objective speckle contrast is reduced from 0.82 to 0.33 when all 10 laser sub-beams are used.
报道了一种用于被动减少激光散斑的等强度分束器（EIBS）。该EIBS由一个分段半波片（SHWP）、一个偏振分束器和一个反射镜组成，其中分段半波片的每个分段的快轴具有设计好的取向。分段半波片是使用图案化光取向材料和液晶聚合物制造的。21像素的EIBS产生了10个激光子光束，其中最大强度比为7.6。由于激光子光束之间的光程延迟，激光的时间和空间相干性被破坏。EIBS用于被动减少激光散斑，当使用所有10个激光子光束时，客观散斑对比度从0.82降低到0.33。
