Yu Yeh-Wei, Xiao Shuai, Cheng Chih-Yuan, Sun Ching-Cherng
Opt Express. 2016 May 16;24(10):10412-23. doi: 10.1364/OE.24.010412.
A simple method to decode the stored phase signal of volume holographic data storage with adequate wave aberration tolerance is highly demanded. We proposed and demonstrated a one-shot scheme to decode a binary-phase encoding signal through double-frequency-grating based shearing interferometry (DFGSI). The lateral shearing amount is dependent on the focal length of the collimated lens and the frequency difference between the gratings. Diffracted waves with phase encoding were successfully decoded through experimentation. An optical model for the DFGSI was built to analyze phase-error induction and phase-difference control by shifting the double-frequency grating longitudinally and laterally, respectively. The optical model was demonstrated experimentally. Finally, a high aberration tolerance of the DFGSI was demonstrated using the optical model.
迫切需要一种简单的方法来解码具有足够波像差容限的体全息数据存储的存储相位信号。我们提出并演示了一种通过基于双频光栅的剪切干涉测量法（DFGSI）来解码二值相位编码信号的单次方案。横向剪切量取决于准直透镜的焦距和光栅之间的频率差。通过实验成功解码了具有相位编码的衍射波。建立了DFGSI的光学模型，分别通过纵向和横向移动双频光栅来分析相位误差诱导和相位差控制。通过实验验证了该光学模型。最后，使用该光学模型证明了DFGSI具有高像差容限。
