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Coaxial holographic encoding based on pure phase modulation |
Applied Optics, Vol. 50, Issue 34, pp. H10-H15 (2011)
http://dx.doi.org/10.1364/AO.50.000H10
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Abstract
We describe a simple technique for coaxial holographic image recording and reconstruction, employing a spatial light modulator (SLM) modified in pure phase mode. In the image encoding system, both the reference beam in the outside part and the signal beam in the inside part are displayed by an SLM based on the twisted nematic LCD. For a binary image, the part with amplitude of “1” is modulated with random phase, while the part with amplitude of “0” is modulated with constant phase. After blocking the dc component of the spatial frequencies, a Fourier transform (FT) hologram is recorded with a uniform intensity distribution. The amplitude image is reconstructed by illuminating the reference beam onto the hologram, which is much simpler than existing phase modulated FT holography techniques. The technique of coaxial holographic image encoding and recovering with pure phase modulation is demonstrated theoretically and experimentally in this paper. As the holograms are recorded without the high-intensity dc component, the storage density with volume medium may be increased with the increase of dynamic range. Such a simple modulation method will have potential applications in areas such as holographic encryption and high-density disk storage systems.
© 2011 Optical Society of America
OCIS Codes
(070.6110) Fourier optics and signal processing : Spatial filtering
(210.2860) Optical data storage : Holographic and volume memories
(090.6186) Holography : Spectral holography
ToC Category:
Optimization, Improvement, Enhancement, and Coding in Digital
Holography
History
Original Manuscript: May 9, 2011
Revised Manuscript: August 10, 2011
Manuscript Accepted: August 23, 2011
Published: September 27, 2011
Virtual Issues
Digital Holography and 3D Imaging 2011 (2011) Applied Optics
Citation
Wei Jia, Zhongyu Chen, Fung Jacky Wen, Changhe Zhou, Yuk Tak Chow, and Po Sheun Chung, "Coaxial holographic encoding based on pure phase modulation," Appl. Opt. 50, H10-H15 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-34-H10
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