Open AccessBand-limited double-phase method for enhancing image sharpness in complex modulated computer-generated holograms
Author(s) -
Xiaomeng Sui,
Zongling He,
Guofan Jin,
Daping Chu,
Liangcai Cao
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.414299
Subject(s) - holography , optics , spatial frequency , phase (matter) , amplitude , spatial filter , noise (video) , image quality , computer science , physics , image (mathematics) , artificial intelligence , quantum mechanics
Herein, we propose a band-limited double-phase method to improve the quality of reconstructed images encoded by double-phase holograms (DPHs) derived from complex-amplitude light waves. Although the quality of images produced by DPHs was improved compared to that of conventional holographic images, it still suffered from degradation because of the spatial shifting noise generated during the conversion from complex-amplitude holograms to phase-only holograms. The proposed method overcomes this shortcoming by defining a band-limiting function according to the spatial distribution of DPHs in the frequency domain to remove the specific spatial frequency components severely affected by the spatial shifting of DPHs. The sharpness of images reconstructed from band-limited DPHs with appropriate optical filtering showed an improvement of 36.84% in simulations and 51.67% in experiments evaluated by 10-90% intensity variation.