Experimental investigation of improving image resolution with fringe field

With fringe fields the experiments were carried out to improve the image resolution. The illuminating field is composed of cosine fringes, then the higher frequency component beyond the cutoff of the optical system can be passed. A higher resolution image can be obtained by processing the images from fringes with the same frequency but different phases. In the experiment, a laser is used to form ten cosine fringe fields which have 1/10 period displacement, every adjacent fringe, and the captured images are integrated to get higher-resolution image. The experiment result shows the method is feasible.