title: Optimized free-form phase mask for extension of depth of field in wavefront-coded imaging.
abstract: To achieve a further extension of the depth of field in wavefront-coded imaging by reducing the impact of focus error in the optical transfer function, we propose the use of a free-form phase mask (FPM) instead of a conventional cubic phase mask (CPM). We optimized the shape of the FPM using the simulated annealing algorithm and confirmed that the optimized FPM provides a much larger focal tolerance and better final images than the CPM in the noise-free case.
authors.affiliation: Department of Applied Physics, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan.
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Shinichi
authors.initials: S
authors.lastname: Komatsu