Open AccessNovel computer-generated hologram encoding method based on partially temporal coherent light
Author(s) -
Xinhui Duan,
Juan Liu,
Xin Li,
Gaolei Xue,
Tao Zhao,
Jing Duan
Publication year - 2019
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.27.006851
Subject(s) - optics , holography , holographic display , speckle pattern , computer science , computer generated holography , phase retrieval , encoding (memory) , wavelength , modulation (music) , transmission (telecommunications) , fresnel diffraction , speckle noise , diffraction , phase modulation , physics , phase noise , artificial intelligence , fourier transform , telecommunications , quantum mechanics , acoustics
Partially temporal coherent light (PTCL) has been applied to holographic reconstruction to reduce speckle noise in display systems, while the encoding methods of computer-generated hologram (CGH), based on PTCL, have not been reported. We propose a novel method to encoding CGH, in which a PTCL with a broadband continuous spectrum is used to illuminate the object image. The continuous spectrum is discretized into different wavelengths and a weight value associated with PTCL power spectrum is assigned to each wavelength. The diffractive transmission is based on Fresnel diffraction theory. The phase distribution of the encoded CGH is obtained using the sum of multiplying the different CGH phase distributions of corresponding discrete wavelengths by the corresponding weight values. The modulation results without iteration are performed to verify the feasibility of the proposed method and the iterative algorithm is introduced to improve the quality of the modulation. The reconstructed images from the proposed encoding method exhibit high quality as compared with that obtained from the encoding method based on ideal temporal coherent light. Numerical simulations and optical experiments are good consistent with each other. The proposed method can provide a reference for various wave-front modulations.