R. Obana, Y. Yoneda and S. Komatsu: Experimental results of wave-front coding system with free-form phase mask, Extended Abstracts (Optics and Photonics Japan 2009) (2009) 104-105. (24aF4)

Wave-front coding(WFC)is a well-known technique for extending the depth of focus of an imaging lens. We experimentally examined characteristics of an optimized free-form phase mask (FPM) that has already been confirmed to be able to extend the on-axis and off-axis depth of focus to much larger values than those for the conventional cubic phase mask (CPM), and we demonstrated the good performance of the FPM under various conditions.