Optical noise reduction by reconstructing positive and negative images from Fourier holograms in coaxial holographic storage systems

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

doi:10.1364/ol.31.001639

Cited by 8 publications

(5 citation statements)

References 8 publications

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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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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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“…The reference and signal beams both propagate along the same optical axis, and the reference beam's scattering noise disturbs data retrieval at low diffraction efficiency. To solve this problem, several techniques have been proposed [8,9]. Although these techniques are effective for noise reduction, the schemes are rather complex and make the total optical system more complicated compared to a typical coaxial system.…”

Section: Polarizing Beam Diffractormentioning

confidence: 99%

Improved performance in coaxial holographic data recording

Tanaka¹,

Hara²,

Tokuyama³

et al. 2007

Opt. Express

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We describe a coaxial holographic recording system for achieving high recording density. We implement several techniques, such as an objective lens with high numerical aperture (NA), high capacity page data format, a random binary phase mask, and an optical noise reduction element. Our system successfully realizes a hologram recording/retrieving at a low diffraction efficiency less than 2.0 x 10(-3) and achieves a raw data density of 180 Gbit/in.(2), thus demonstrating the potential of a coaxial holographic system for high-density optical storage systems.

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“…Compared with the traditional off-axis type of holographic storage system, the collinear type is a more compact system and has better stability [7][8][9][10], which enables easy miniaturization [11], and has a larger wavelength margin [12]; moreover, a semiconductor laser can be applied to the system. In addition, a collinear holographic storage system can be combined with a servo system, and the compatibility and vibration resistance of the storage system would also become stronger [13,14]. The recording medium in a holographic storage system would undergo dimensional change [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Combination Compensation Method to Improve the Tolerance of Recording Medium Shrinkage in Collinear Holographic Storage

et al. 2022

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Holographic optical storage has great potential for enormous data storage, although the recording medium can cause dimensional change, which can deteriorate the quality of the reconstructed hologram. Compensation in traditional off-axial holographic storage systems is sensitive to vibration and requires high precision. In contrast, a collinear system is more compact with better stability, and its compensation would be different. In this paper, the combination compensation method for compensating for the dimensional change of the recording medium by simultaneously adjusting the reading light wavelength and the focal length of the objective lens is established, which was implemented in a collinear system for a high dimension-change-rate (σ) of the medium condition. Its compensation effects for the lateral dimension change and the vertical dimension change were compared as well. The results show that the bit error ratio of the reconstructed hologram could be decreased to 0 for both of the dimensional change conditions with a large adjustment scope under σ = 1.5%. Compared with the compensation method, in which only the focal length or the wavelength are adjusted, this combination compensation method can enlarge the compensation scope and improve the tolerance of the recording medium shrinkage in a collinear holographic storage system.

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Optical noise reduction by reconstructing positive and negative images from Fourier holograms in coaxial holographic storage systems

Cited by 8 publications

References 8 publications

Intermediate Holographic Data Storage System by Using Sequentially Superimposed Recording

Intermediate Holographic Data Storage System by Using Sequentially Superimposed Recording

Improved performance in coaxial holographic data recording

Combination Compensation Method to Improve the Tolerance of Recording Medium Shrinkage in Collinear Holographic Storage

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