Y. Takahashi, R. Obana and S. Komatsu: Optimized phase mask for wave-front coding: Extended DOF in off axis field, Extended Abstracts (Optics and Photonics Japan 2007) (2007) 464-465.

We optimized the phase mask for wave-front coding and succeeded to extend the on-axis depth of focus much larger than the conventional cubic phase mask (CPM). In this study we investigate the off-axis imaging characteristics of our optimized phase mask. Computer simulation results show that the optimized phase mask reveals better performance than the CPM in the off axis field as well.