1 珑璟光电-微纳光学研究中心，广东 深圳 518000
2 浙江省光信息检测与显示技术研究重点实验室，浙江 金华 321004
提出了一种紧凑型纯相位全息近眼显示方法，避免了4f系统的使用且通过滤波可消除零级光和高级衍射光的干扰，能够实现近眼虚拟现实（VR）和增强现实（AR）三维显示。在进行全息图计算时，三维物体被分割成多层图像，利用每一层图像相对于投影透镜焦平面的距离和投影透镜的焦距获得该深度对应的补偿相位因子，采用迭代优化算法获得三维物体的纯相位全息图并在所提系统中进行显示。通过数值模拟和光学实验，证明了所提方法的有效性。
全息 全息三维显示 近眼显示 相位全息 虚拟现实 增强现实
Author Affiliations
Abstract
Faculty of Physics and Optoelectronic Engineering, Institute for Nanophysics and Rare-Earth Luminescence, Xiangtan University, Xiangtan 411105, China
Li+-doped HoPO4 powders with a pure tetragonal phase are successfully synthesized by the co-precipitation method. It exhibits an obvious color change under sunlight and tri-phosphor fluorescent light illumination. The introduction of Li+ ions into HoPO4 can further enhance its photochromic property effectively. The doped Li+ ions induce changes in the crystal structure. The spectral characteristics and thus photochromic properties of HoPO4 are explored. The improved HoPO4 powder, when used as a photochromic material, has wide-ranging prospects in security, decoration, and other applications.
160.5690 Rare-earth-doped materials 300.1030 Absorption 330.1720 Color vision Chinese Optics Letters
2015, 13(3): 031601
Author Affiliations
Abstract
Ce3+/Er3+/Bi3+ triply-doped yttrium aluminum garnet (YAG) is synthesized using co-precipitation method. The Bi3+ concentration-dependent near-infrared (NIR) emission behavior is systemically investigated. The NIR emission of Er3+ ions at 1531 nm is enhanced threefold by the addition of 7 mol% Bi3+. Bi3+doping results in the formation of exciton in YAG and the variation in the local environment of the doped rare-earth ions. The enhancement in NIR luminescence is ascribed to the combined effects of the sensitization of exciton!Ce3+ !Er3+ and the Bi3+ doping-induced adjustment of the local environment for Ce3+ and Er3+ ions.
260.0260 Physical optics 260.2160 Energy transfer 260.3800 Luminescence Chinese Optics Letters
2013, 11(12): 122602
