Coaxial holographic data storage without recording the dc components

Yasuda, Shin; Kawano, Katsunori; Minabe, Jiro; Ogasawara, Yasuhiro; Hayashi, K.; Haga, Koichi; Yoshizawa, Hisae; Furuki, Makoto

doi:10.1364/ol.31.002607

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…In order to avoid this problem, the multiplexed holograms are recorded a distance away from the exact FT plane. Other techniques have been researched to smooth the intensity in the exact FT plane [17][18][19][20]. In this section, we describe a novel method to achieve homogeneous collinear holographic data encoding.…”

Section: Theoretical Analysismentioning

confidence: 99%

Novel modulation techniques for collinear holographic data encoding

Jia

Chen

Chung

et al. 2012

Practical Holography XXVI: Materials and Applications

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We describe two novel modulation techniques for collinear holographic data encoding, employing a spatial light modulator (SLM) based on twisted nematic LCD. In the Fourier transform holographic storage system, the reference beam in the outside part and the object beam in the inside part are simultaneously modulated by one single SLM, with different modulation techniques. In one of the modulation methods, the reference beam is phase modulated with a circular blazed grating pattern, and then diffracted into the central part to interfere with the amplitude modulated object beam. Multiple holograms can be recorded on the same location with reference beams of different grating period. Another modulation method is to modulate both the reference beam and the object beam with pure phase modulation by the SLM. The binary ones are encoded with random phase shift from 0 to 2π, while the binary zeroes are encoded with a constant phase of 0. When the dc component of the spatial frequency generated by the binary zeroes is blocked, a homogeneous hologram will be obtained, and the amplitude object will be reconstructed directly. In this paper, both of the two modulation methods are performed theoretically and experimentally. From the experimental results, it can be seen that the blazed-grating modulation technique gets a higher efficiency, while pure phase modulation method can reconstruct the images with more uniform intensity. These techniques are demonstrated to be attractive for applications in data storage and encryption systems.

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Section: Theoretical Analysismentioning

confidence: 99%

Novel modulation techniques for collinear holographic data encoding

Jia

Chen

Chung

et al. 2012

Practical Holography XXVI: Materials and Applications

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show abstract

“…The optical setup in [20] can be used for an FT hologram without the dc component; however, a simplified setup is adopted in our experiment, which is schematically shown in Fig. 5.…”

Section: Simulation and Experimental Demonstrationmentioning

confidence: 99%

“…However, the holograms are recorded a little distance away from the FT plane, as the dc component intensity is relatively high. Yasuda et al [20] proposed a coaxial holographic data storage technique on the FT plane without recording the dc component. The data page modulated with binary amplitude is Fourier transformed and the dc component is blocked before the FTH is carried out.…”

Section: Introductionmentioning

confidence: 99%

Coaxial holographic encoding based on pure phase modulation

et al. 2011

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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.

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“…In recent studies of the holographic storage system, the co-axial lens system has been one of the main issues [9][10][11][12][13]. This lens system is simple and makes it easy to perform the angular multiplexing.…”

Section: Lens Systemmentioning

confidence: 99%

Intermediate Holographic Data Storage System by Using Sequentially Superimposed Recording

Lee

2009

Journal of the Optical Society of Korea

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We introduce a holographic data storage system for intermediating between small data sets and mass holographic data recording. It employs a holographic sequentially superimposed recording technique. We discuss a time scheduling technique for making uniform reconstruction of sequentially recorded holograms and we show experimental results. We also discuss the Bragg selectivity of sequentially recorded holograms. The maximum storage density of our system is estimated to be 224kbit/mm 2 . Our system is useful as an intermediate recording system before recording mass holographic data in a larger system.

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Coaxial holographic data storage without recording the dc components

Cited by 9 publications

References 7 publications

Novel modulation techniques for collinear holographic data encoding

Novel modulation techniques for collinear holographic data encoding

Coaxial holographic encoding based on pure phase modulation

Intermediate Holographic Data Storage System by Using Sequentially Superimposed Recording

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