Opt Express. 2023 Apr 10;31(8):12922-12931. doi: 10.1364/OE.488116.
Holography provides an approach to reconstructing both intensity and phase information, and has many applications for microscopic imaging, optical security, and data storage. Recently, the azimuthal Laguerre-Gaussian (LG) mode index, orbital angular momentum (OAM), has been implemented in holography technologies as an independent degree of freedom for high-security encryption. The radial index (RI) of LG mode, however, has not been implemented as an information carrier in holography. Here we propose and demonstrate the RI holography by using strong RI selectivity in the spatial-frequency domain. Furthermore, the LG holography is realized theoretically and experimentally with the (RI, OAM) spanning from (1, -15) to (7, 15), which leads to a 26bit LG-multiplexing hologram for high-security optical encryption. Based on LG holography, a high-capacity holographic information system can be constructed. In our experiments, a LG-multiplexing holography with a span of 217 independent LG channels has been realized, which is inaccessible at present for the OAM holography.
全息术提供了一种重建强度和相位信息的方法，在微观成像、光安全和数据存储等方面有很多应用。最近，角向拉盖尔-高斯（LG）模式指数、轨道角动量（OAM）已被应用于全息术技术中，作为一种独立的自由度，用于高安全性加密。然而，LG 模式的径向指数（RI）尚未被用作全息术中的信息载体。在这里，我们通过在空间频率域中利用强 RI 选择性来提出并演示 RI 全息术。此外，我们还从（1，-15）到（7，15）理论和实验上实现了 LG 全息术，从而实现了用于高安全性光加密的 26 位 LG 复用全息图。基于 LG 全息术，可以构建一个大容量的全息信息系统。在我们的实验中，实现了具有 217 个独立 LG 通道的 LG 复用全息图，这对于 OAM 全息术来说是目前无法实现的。
