title: Depth resolution enhancement in double-detection optical scanning holography.
abstract: We propose an optical scanning holography system with enhanced axial resolution using two detections at different depths. By scanning the object twice, we can obtain two different sets of Fresnel zone plates to sample the same object, which in turn provides more information for the sectional image reconstruction process. We develop the computation algorithm that makes use of such information, solving a constrained optimization problem using the conjugate gradient method. Simulation results show that this method can achieve a depth resolution up to 1 μm.
authors.affiliation: Department of Electrical and Electronic Engineering, University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Ou
authors.forename: Ting-Chung
authors.initials: TC
authors.lastname: Poon
authors.forename: Kenneth K Y
authors.initials: KK
authors.lastname: Wong
authors.forename: Edmund Y
authors.initials: EY
authors.lastname: Lam