Gray-level image generation by multiphase diffraction grating

The diffraction gratings which split a incoming beam into multiple spots are useful optical devices for the generation of regular array in the Fourier plane. The structure of the grating can be divided into rectangular cells such that each cell imparts a phase delay of O~2π[rad] to the incident wave front. So, this pixelated grating is called multiple-beam hologram or computer-generated hologram, and it can produce a desired diffraction pattern at the arbitrary positions. In this paper, we have designed and implemented the diffraction gratings written by laser pattern generator for obtaining a images that have weighted intensity values