Optical Collinear Holographic Recording System Using a Blue Laser and a Random Phase Mask

Ishioka, Koji; Tanaka, Kenji; Kojima, Naoto; Fukumoto, Atsushi; Sugiki, Mikio

doi:10.1364/isom_ods.2005.the3

Cited by 11 publications

(7 citation statements)

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“…Early systems used shift multiplexing, but more recent systems have switched to phase correlation multiplexing [28,[32][33][34][35][36]. The phase structure is either embedded into the SLM, or imaged onto it, which homogenizes the Fourier transform of the data beam in addition to providing the phase information needed for phase correlation.…”

Section: Collinear Holographic Storagementioning

confidence: 99%

Recent advances in holographic data storage

Ruan

2014

Front. Optoelectron.

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Nowadays, big-data centers still rely on hard drives. However, there is strong evidence that these surface-storage technologies are approaching fundamental limits that may be difficult to overcome, as ever-smaller bits become less thermally stable and harder to access. An intriguing approach for next generation data-storage is to use light to store information throughout the threedimensional (3D) volume of a material. Holographic data storage (HDS) is poised to change the way we write and retrieve data forever. After many years of developing appropriate recording media and optical read-write architectures, this promising technology is now moving industriously to the market. In this paper, a review of the major achievements of HDS in the past ten years is presented and the key technique details are discussed. The author concludes that HDS technology is an attractive candidate for big data centers in the future. On the other hand, there are many challenges ahead for HDS technology to overcome in the years to come.

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Section: Collinear Holographic Storagementioning

confidence: 99%

Recent advances in holographic data storage

Ruan

2014

Front. Optoelectron.

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“…Instead, we draw on experimental practices. One report by practitioners of angle-polytopic holography cites an average hologram diffraction efficiency of η ¼ 6:8 × 10 −4 [29], whereas another contemporaneous report by blue collinear holographers cites a range of η ¼ 1:3 × 10 −2 to 1:8 × 10 −2 [10], and a later report notes an improvement to η ¼ 2:5 × 10 −3 [11]. No data disclosing a diffraction efficiency for a green collinear experiment is known by these authors.…”

Section: Noise-limited Signal Requirementsmentioning

confidence: 99%

“…For this work, we choose order-of-magnitude estimates for the required diffraction efficiency of η ¼ 1 × 10 −3 for the angle-polytopic model, and η ¼ 2:5 × 10 −3 and η ¼ 1 × 10 −2 for the blue and green collinear models, respectively. The latter two diffraction efficiency values are taken from the relevant literature when such values are given (e.g., [10,11]) and are otherwise estimated.…”

Section: Noise-limited Signal Requirementsmentioning

confidence: 99%

“…We will thus illustrate our procedure by comparing storage medium requirements in these two cases. The first architecture, collinear holography, uses a single recording beam containing both object and reference components to record in a medium with a reflective substrate [8][9][10][11]. Multiplexing is achieved by exploiting fine x, y shift selectivity to densely overlap the holograms.…”

Section: Introductionmentioning

confidence: 99%

“…We will use parameters for InPhase Technology Corporation's prototype HDS drive for the angle-polytopic model, and parameters from published studies for the collinear architectures to the extent they have been reported in the literature. As at least two variants of collinear recording have been published, one using a green recording wavelength [8], and one using blue [10,11], we will treat them separately. In order to yield specific numerical results, we will characterize the architectures at a recording density of 186 user bits=μm 2 , which corresponds to a capacity of approximately 200 Gbytes on a 120 mm disk.…”

Section: Introductionmentioning

confidence: 99%

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Medium consumption in holographic memories

Ayres

McLeod

2009

Appl. Opt.

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The dynamic range of holographic storage media is traditionally characterized in terms of M/#. However, this is a system parameter that assumes simple, uniform plane-wave holograms. Realistic architectures violate this assumption so that M/# measured with plane waves cannot be used to predict system diffraction efficiency. Thus, there currently is no systematic method predicting signal strength and medium consumption for holographic storage architectures a priori. We define a new material parameter, the modulation integral, M(I), and show how this may be used for dynamic range budgeting and diffraction efficiency prediction in complex storage systems. The method is illustrated by applying it to two architectures, collinear and angle polytopic, in order to estimate the M/# required for achieving a target storage density in the presence of empirical optical scatter noise.

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