Enhancement of a tunable blue laser for holographic data storage

Omori, Masaki; Kondō, Hideki; Miyata, Tadaaki; Mori, Nobuya; Matsuo, Hidenori; Sasamuro, Takashi; Okauchi, Shigeki; Ensher, Jason; Harris, Rod; Wegner, Aaron; Cozakos, Jason

doi:10.1117/12.858057

Cited by 8 publications

(4 citation statements)

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“…The wavelength of the laser beam was tunable in the range of 402-408 nm using an external resonator in the LD unit. 29) The phase distribution of the signal beam was randomly shifted using a phase mask to diffuse the light and to prevent localized monomer consumption at the focal point in the medium. 30) The signal beam amplitude was modulated using a spatial light modulator (SLM) with 1;200 Â 820 pixels and 10.7 m pixel pitch.…”

Section: Methodsmentioning

confidence: 99%

1 Tbit/inch² Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule

Hosaka

Ishii

Tanaka

et al. 2013

Jpn. J. Appl. Phys.

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We developed an iterative method for optimizing the exposure schedule to obtain a constant signal-to-scatter ratio (SSR) to accommodate various recording conditions and achieve high-density recording. 192 binary images were recorded in the same location of a medium in approximately 300×300 µm2 using an experimental system embedded with a blue laser diode with a 405 nm wavelength and an objective lens with a 0.85 numerical aperture. The recording density of this multiplexing corresponds to 1 Tbit/in.2. The recording exposure time was optimized through the iteration of a three-step sequence consisting of total reproduced intensity measurement, target signal calculation, and recording energy density calculation. The SSR of pages recorded with this method was almost constant throughout the entire range of the reference beam angle. The signal-to-noise ratio of the sampled pages was over 2.9 dB, which is higher than the reproducible limit of 1.5 dB in our experimental system.

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Section: Methodsmentioning

confidence: 99%

1 Tbit/inch² Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule

Hosaka

Ishii

Tanaka

et al. 2013

Jpn. J. Appl. Phys.

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“…17 Frame rate (fps) 0.8 k holographic disc. 37) The SLM in Fig. 17(c) has 4.4 M pixels and a display speed of 1.7 k fps with a ferroelectric liquid crystal, as required for a transfer rate of 1 Gbps in recording.…”

Section: Disc and Components For 2 Tb And 1 Gbps Systemmentioning

confidence: 99%

Practical angular-multiplexing holographic data storage system with 2 terabyte capacity and 1 gigabit transfer rate

Hoshizawa

Shimada

Fujita

et al. 2016

Jpn. J. Appl. Phys.

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Aiming at the realization of an optical data storage system with a large disc capacity and a high transfer rate suitable for digital data archiving, we have defined the specifications of an angular-multiplexing holographic data storage system with a disc capacity of 2 TB and a transfer rate of 1 Gbps on the basis of a run-length-limited (RLL) high-density recording method using RLL modulation. To realize the specifications, RLL turbo coding, a servo system for the reference beam angle, and a servo system for book tracking were newly invented. Also, to satisfy the specifications, a holographic disc and several key components were developed in cooperation with several specialty companies. Eventually, we confirmed a high-density recording of 2.4 Tbit/in.2 achieved by the RLL high-density recording method, using evaluation equipment complying with the specifications for single book recording.

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“…13 Figure 4(a) shows light propagation in holographic recording state for both signal and reference beams. A light beam outputted from external cavity laser diode (ECLD) 14 is divided into signal and reference beams by beam splitter (BS). Signal beam is transmitted through the BS proceeds to be incident on a spatial light modulator (SLM).…”

Section: Compatible Optical System Between Hdss and Bd Using The Monomentioning

confidence: 99%

New optical architecture for holographic data storage system compatible with Blu-ray Disc™ system

et al. 2014

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Abstract. A new optical architecture for holographic data storage system which is compatible with a Blu-ray Disc™ (BD) system is proposed. In the architecture, both signal and reference beams pass through a single objective lens with numerical aperture (NA) 0.85 for realizing angularly multiplexed recording. The geometry of the architecture brings a high affinity with an optical architecture in the BD system because the objective lens can be placed parallel to a holographic medium. Through the comparison of experimental results with theory, the validity of the optical architecture was verified and demonstrated that the conventional objective lens motion technique in the BD system is available for angularly multiplexed recording. The test-bed composed of a blue laser system and an objective lens of the NA 0.85 was designed. The feasibility of its compatibility with BD is examined through the designed test-bed.

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Enhancement of a tunable blue laser for holographic data storage

Cited by 8 publications

References 0 publications

1 Tbit/inch² Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule

1 Tbit/inch² Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule

Practical angular-multiplexing holographic data storage system with 2 terabyte capacity and 1 gigabit transfer rate

New optical architecture for holographic data storage system compatible with Blu-ray Disc™ system

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Enhancement of a tunable blue laser for holographic data storage

Cited by 8 publications

References 0 publications

1 Tbit/inch2 Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule

1 Tbit/inch2 Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule

Practical angular-multiplexing holographic data storage system with 2 terabyte capacity and 1 gigabit transfer rate

New optical architecture for holographic data storage system compatible with Blu-ray Disc™ system

Contact Info

Product

Resources

About

1 Tbit/inch² Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule

1 Tbit/inch² Recording in Angular-Multiplexing Holographic Memory with Constant Signal-to-Scatter Ratio Schedule