Kang Ruidan, Liu Juan, Pi Dapu, Duan Xinhui
Opt Express. 2020 Apr 13;28(8):11290-11300. doi: 10.1364/OE.390199.
A curved hologram can increase the view angle in a holographic display. The huge data processing and curved computer-generated hologram (CCGH) computation time is still a challenge for real-time display. Here, we propose two fast methods to accelerate the computation. The first one is a diffraction compensation (DC) method where the diffraction calculation is from the wave-front recording plane (WRP) to a CCGH. The other is an approximate compensation (AC) method that adds a phase difference distribution to the WRP to obtain the CCGH. Numerical simulations and optical experiments are performed, which demonstrate that the two methods are feasible and the computation time is dramatically reduced. The AC method can further reduce time significantly compared with the DC method. And the image quality for proposed methods is similar. It is expected that these fast methods can be combined with curved display screen and flexible display materials in the future.
弯曲全息图可以增加全息显示中的视角。巨大的数据处理量以及弯曲计算机生成全息图（CCGH）的计算时间对于实时显示而言仍是一项挑战。在此，我们提出两种加速计算的快速方法。第一种是衍射补偿（DC）方法，其中衍射计算是从波前记录平面（WRP）到CCGH。另一种是近似补偿（AC）方法，即在WRP上添加一个相位差分布以获得CCGH。我们进行了数值模拟和光学实验，结果表明这两种方法是可行的，并且计算时间大幅减少。与DC方法相比，AC方法能进一步显著减少时间。并且所提方法的图像质量相近。预计这些快速方法未来可与弯曲显示屏及柔性显示材料相结合。
