Reflective Diffraction Grating

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.