Digital off-axis holography with angular multiplexing and synthetic aperture

• Main Authors: Wang, Zhaomin, Qu, Weijuan, Yang, Fang, Wen, Yongfu, Anand, Asundi
• Other Authors: Asundi, Anand K.
• Format: Conference or Workshop Item
• Language: English
• Published: 2018
• Subjects: Digital Holography; DRNTU::Engineering::Mechanical engineering; Synthetic Aperture
• Online Access: https://hdl.handle.net/10356/88483; http://hdl.handle.net/10220/46932
• Institution: Nanyang Technological University

This paper discusses conventional synthetic-aperture method combined angular multiplexing in digital holography to increase the resolution and to enlarge the field of view at the same time. A structured illumination is used to realize angular multiplexing. A camera is moved by a motorized x-y stage, and scanning is performed at imaging plane. In this way we extend the band-pass for single hologram recording as well as obtain a greater sensor area resulting in a larger numerical aperture (NA). A larger NA enables a more detailed reconstruction combined with a smaller depth of field. Moreover, a phase map of the object is experimentally presented.