Phase optimization for phase contrast projection display

摘要

A technique displaying arbitrary images based on phase contrast imaging with phase optimization method is proposed. Phase optimization is performed in a way similar to the iterative Fourier transform algorithm which considers the phase shift and the aperture size of the phase contrast filter. We test and compare two phase shift cases, which are π/2 and π, in optimization process. The phase contrast filter at the Fourier plane is implemented using photopolymer whose optically induced refractive index change has a linear dependence on the illuminating light intensity. As a result, the proposed method is capable of displaying arbitrary images with enhanced quality and high light efficiency in phase contrast projection field. Also when the phase contrast filter has π phase shift, the enhancement of the output intensity image is more obvious.