光電資訊交連系統之元件設計實作

• Main Authors: Li, Chuan-Chun, 李全春
• Other Authors: Lu, Yibin
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/68561445520516264381

碩士 === 國防大學中正理工學院 === 電子工程研究所 === 90 === ABSTRACT In this thesis, we propose a new approach to design the multi-wavelength diffractive optical elements. Our approach is based on iterative discrete fractional Fourier transform (DFRFT) to find a fast and efficient method in manufacturing a adequate diffractive optical elements (DOEs) suitable for several wavelengths. The DOEs based on basic diffraction theorem have the advantages of small size, light weight, flexibility and easy duplication. This thesis introduces a modified Gerchberg-Saxton algorithm, and takes fractional Fourier transform as free space propagated transform function. Recently the fractional Fourier transform has been found to play a significant roll as Fourier optics does. Due to the DFRFT’s properties, it’s not difficult to design a asymmetrical image pattern even with only two levels DOE. Also, the combination of FRT and Fresnel diffractive pattern has an advantage of suitable diffracted field for any distance. Simulation results using Matlab 5.3 software are presented, which demonstrate the validity of this approach by using a convenient graphical user interface program.