Abstract In this paper, we present an optical encryption system which uses the principle of unequal modulus decomposition and polarization vortex optical holography to implement encoding and decoding. Firstly, the original image is decomposed into two complex amplitude images by unequal modulus decomposition method, then their polarization states are changed by vortex beams irradiation, and finally they are encrypted in the photorefractive crystals by polarization multiplexing holographic technology. In decryption, the image can be reconstructed successfully when a series of correct keys are provided. The sensitivity of polarization state and the multiplexing performance of topological charge are also analyzed, proving the method has high security.

中文翻译：

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基于不等模量分解和偏振涡旋光全息的光学加密系统研究

摘要 本文提出了一种利用不等模分解原理和偏振涡旋光全息实现编解码的光学加密系统。首先用不等模量分解法将原始图像分解为两幅复幅图像，然后通过涡旋光束照射改变它们的偏振态，最后通过偏振复用全息技术加密在光折变晶体中。在解密中，当提供一系列正确的密钥时，可以成功地重建图像。还分析了偏振态的灵敏度和拓扑电荷的复用性能，证明该方法具有较高的安全性。