Yoneda Naru, Nobukawa Teruyoshi, Morimoto Toshiyuki, Saita Yusuke, Nomura Takanori
Opt Lett. 2021 Jun 15;46(12):2920-2923. doi: 10.1364/OL.427113.
An unconventional angular-multiplexed recording technique is proposed for holographic data storage based on a computer-generated hologram (CGH) technique. While general angular-multiplexed recording techniques require a Mach-Zehnder interferometer to record data pages as volume holograms, the proposed method records ones with a common-path configuration with the help of a CGH technique, which prevents the optical setup from being bulky. In the proposed method, the CGH reconstructs signal and reference beams simultaneously, and these beams interfere in a recording medium. By changing the diffraction angle of the reference beam from the CGH, angular multiplexing is accomplished with a common-path optical setup without additional optical elements. Multiplexed recording of four data pages is demonstrated in a proof-of-principle experiment, which indicates the feasibility of the proposed method.
提出了一种基于计算机生成全息图（CGH）技术的非传统角度复用记录技术用于全息数据存储。虽然一般的角度复用记录技术需要马赫-曾德尔干涉仪将数据页记录为体全息图，但该方法借助CGH技术以共光路配置进行记录，这避免了光学装置体积庞大。在所提出的方法中，CGH同时重建信号光束和参考光束，这些光束在记录介质中发生干涉。通过改变来自CGH的参考光束的衍射角，利用共光路光学装置无需额外光学元件即可实现角度复用。在原理验证实验中展示了四个数据页的复用记录，这表明了该方法的可行性。
