期刊
OPTICS COMMUNICATIONS
卷 443, 期 -, 页码 19-25出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2019.03.016
关键词
Phase-only hologram; Double-phase method; Holographic encryption
类别
资金
- National Key R&D Program of China [2017YFB1002900]
- Sichuan Science and Technology Program [2018GZ0533]
An improved single-random-phase holographic encryption (SRPHE) is proposed by using double-phase method and demonstrated by a spatial light modulator (SLM). Different from the conventional SRPHE using Fresnel diffraction and the bidirectional error diffusion method, the proposed SRPHE employees the angular spectrum diffraction and double-phase method to generate a phase-only hologram, and the phase-only hologram is encrypted into ciphertext by multiplying a single random phase mask. When the ciphertext is modulated by the conjugate of the random phase mask and loaded to a SLM, the decrypted image can be achieved successfully. The improved SRPHE has two advantages of better quality of the decrypted image, and lower time-cost of hologram generation, which is compared with the conventional SRPHE. Numerical simulations and optical reconstruction results have been carried out to verify the validity of the proposed SRPHE.
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