反射式衍射光栅的研究

【作者】 谭庆贵；

【导师】 李慎；

【作者基本信息】 电子科技大学 ， 光学， 2002， 硕士

【摘要】 反射式衍射光栅是一种具有极高衍射效率的计算机光学元件，能将入射光束以需要的强度分布聚焦到指定的区域。基于计算机辅助设计和微细加工技术制成的平面浮雕形计算机光学元件，具有造价低、易复制、重量轻等优点，并能实现传统光学难以完成的微小、阵列、集成等新功能，被广泛的应用在激光工艺、医学、光学信息处理、传输控制和光通信等领域。 本论文基于几何光学理论和标量衍射理论提出了设计反射式衍射光栅的逆变换算法和理论模型，推出了计算反射式衍射光栅表面浮雕高度的差分方程。通过计算机辅助设计，计算得到了反射式衍射光栅表面的浮雕高度，设计了反射式衍射光栅。计算机模拟得到的结果与所需的衍射图样相符合。文中还讨论了光栅参数对成像质量的影响，提出改进反射式衍射光栅特性的建议。更多还原

【Abstract】 Diffraction grating, which can convert incident field of light beam to the required field in certain position, is a computer optical device with very high diffraction efficiency. Computer Optics, a rapidly developing new approach of optics, originates from Computer science, Optics and Microelectronics. The optic devices designed with computer with phase relief on plane which are cheap, light and easy to be made and can be integrated, miniaturized and made in array, are used in many fields such as laser processing techniques, optic communications, biomedicine, wave beam control.This paper provides an algorithm of reverse transformation and a model theory to design diffraction gratings based on geometrical theory and sealer quantity diffractive theory. The height of phase relief is achieved by finding the solution of the difference equation with computer calculation. Using the model theory and the algorithm, a diffraction grating, which converts the field of Gaussian beam to the uniform field in a square, is designed. With computer simulation and drawing program, the diffraction pattern is got in this paper. By changing the parameters using to design the grating, different diffraction patterns are gained. Through analyzing the different diffraction patterns, the best parameters are given.更多还原