Sakamoto Moritsugu, Nhan Huynh Thanh, Noda Kohei, Sasaki Tomoyuki, Kamei Tadayoshi, Sakai Takeya, Hattori Yukitoshi, Kawatsuki Nobuhiro, Ono Hiroshi
Appl Opt. 2021 Mar 1;60(7):2062-2068. doi: 10.1364/AO.416089.
A polarized laser beam steering system using multiply cascaded rotating polarization gratings (PGs) is presented. The rotating PGs steer incident circularly polarized beams with high optical throughput because the theoretical limitation of the PG diffraction efficiency is 100%. The system also offers more rapid rotation when compared with wedge prism pairs because of the weight of the PGs. The beam steering performance was analyzed theoretically for schemes using two and four rotating PGs. The system's feasibility was demonstrated experimentally by projecting Lissajous and raster patterns using PGs fabricated from photocrosslinkable polymer liquid crystal films via a photo-alignment technique. The steered beam's diffraction efficiency and ellipticity were maintained at 83∼89 and 96∼99, respectively, during PG rotation. This beam steering system will be applicable to light detection and ranging, optical imaging, and laser displays.
本文提出了一种使用多个级联旋转偏振光栅（PG）的偏振激光束转向系统。旋转的PG能够以高光学通量引导入射圆偏振光束，因为PG衍射效率的理论极限为100%。由于PG的重量，与楔形棱镜对相比，该系统还能实现更快的旋转。对使用两个和四个旋转PG的方案进行了理论上的光束转向性能分析。通过使用光交联聚合物液晶薄膜通过光取向技术制造的PG投射李萨如图形和光栅图案，对该系统的可行性进行了实验验证。在PG旋转过程中，转向光束的衍射效率和椭圆率分别保持在83%至89%和96%至99%。这种光束转向系统将适用于光探测与测距、光学成像和激光显示。
