Open AccessSpeckle reduced lensless holographic projection from phase-only computer-generated hologram
Author(s) -
Chenliang Chang,
Yijun Qi,
Jun Wu,
Jun Xia,
Shouping Nie
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.006568
Subject(s) - holography , optics , speckle pattern , holographic display , speckle noise , wavefront , computer generated holography , fresnel diffraction , spatial light modulator , computer science , image quality , image plane , diffraction , virtual image , projection (relational algebra) , physics , computer vision , image (mathematics) , algorithm
This paper presents a method for the implementation of speckle reduced lensless holographic projection based on phase-only computer-generated hologram (CGH). The CGH is calculated from the image by double-step Fresnel diffraction. A virtual convergence light is imposed to the image to ensure the focusing of its wavefront to the virtual plane, which is established between the image and the hologram plane. The speckle noise is reduced due to the reconstruction of the complex amplitude of the image via a lensless optical filtering system. Both simulation and optical experiments are carried out to confirm the feasibility of the proposed method. Furthermore, the size of the projected image can reach to the maximum diffraction bandwidth of the spatial light modulator (SLM) at a given distance. The method is effective for improving the image quality as well as the image size at the same time in compact lensless holographic projection system.