الفهرس 
Fundamentals of Optical System AnalysisOnly 14 pages are availabe for public view
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Abstract
In recent years, there has been an increasing interest in the use of optical techniques for information security applications. Compared with traditional computer and electrical systems, optical technologies offer primarily two types of benefits. First, Optical systems have an inherent capability for parallel processing, that is, rapid transmission of information. Second, Information can be hidden in any of several dimensions, such as amplitude, phase, polarization, and wavelength, etc., making it possible to encode data more securely. It has been accepted that optical encryption technologies provide a more complex environment and are more resistant to attacks compared with digital electronic systems. Due to this reason, optical techniques are being extensively developed for optical encryption and data transfer.Several techniques are proposed for optical image encryption. Among them, Double random phase encoding (DRPE) is considered the most widely used optical encryption technique. In this thesis, the implementation of a secure optical system using double phase masks and transmission phase grating is described. A two-dimensional amplitude image is encrypted and decrypted by using a spatial light modulator working in amplitude mode. Simulation results are provided to verify the proposed study. The mean square error between the primary image and decrypted image has been calculated to study the sensitivity of the system.The proposed optical encoding system has several advantages compared to the classical double random phase encoding (DRPE) system; it is much compact, simpler, and inexpensive. Simulation results are presented in support of the proposed idea. from the numerical results, the proposed system increasing the system security by increasing the key size.