PatentDOI
Holographic storage using shift multiplexing
TLDR
In this article, the authors present a method of recording successive holograms in a recording medium, using at least a fan of M waves along at least one first axis with a separation angle between adjacent waves and directing the fan of the M waves as a reference beam along a reference path onto the recording medium.Abstract:
The invention is embodied in a method of recording successive holograms in a recording medium, using at least a fan of M waves along at least a first axis with a separation angle between adjacent waves and directing the fan of M waves as a reference beam along a reference beam path onto the recording medium, successively modulating a wave with a succession of images to produce a succession of signal beams along a signal beam path lying at a propagation angle relative to the reference beam path so that the signal and reference beams intersect at a beam intersection lying within the medium, the beam intersection having a size corresponding to beam areas of the reference and signal beams, producing a succession of relative displacements in a direction parallel to the first axis between the recording medium and the beam intersection of the signal and reference beam paths in synchronism with the succession of signal beams, each of the displacements being less than the size of the intersection whereby to record successive holograms partially overlapped along a direction of the displacements.read more
Citations
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Patent
Holographic storage system for reading a hologram stored on a holographic storage medium and a method carried out therewith
Gabor Erdei,Ferenc Ujhelyi +1 more
TL;DR: In this article, the authors proposed a method of reading a hologram (7) stored on a holographic storage medium (6) comprising the steps of encoding a reference beam (3) with a code pattern (15) created by a spatial light modulator (SLM), detecting an image of the reconstructed hologram, determining a misalignment of said reference beam(3) and said storage medium(6) from the detected image; and shifting said code pattern(15) on the SLM (4) based at least in part on said misal alignment.
Journal ArticleDOI
Shift selectivity in common-aperture holography
Wolfgang Hossfeld,Joachim Knittel,Oliver Malki,Frank Przygodda,Hartmut Richter,Heiko Trautner +5 more
TL;DR: Common-aperture holography is presented as an alternative shift multiplexing concept in this paper, and the experimental results are discussed and compared to theoretical predictions calculated with the beam propagation method.
Journal ArticleDOI
Tilt measurement and compensation algorithm for holographic data storage with optimized quadratic windows
TL;DR: Using a quadratic window, which compares the intensity of a certain area, a tilt error signal was generated and compensated for with the proposed algorithm and the compensated image obtained satisfied a 0.3 dB tolerance.
Patent
System and method for real time holographic data recording and readout
TL;DR: In this article, a method for holographic data recording and simultaneous data readout without requiring additional optical power for readout illumination is provided, which comprises reflecting a transmitted portion of a data light beam or of a reference light beam used for holographics recording of data in a holographic storage medium.
Proceedings ArticleDOI
IPI noise reduction by fuzzy rules and data compression using wavelet transform method in a holographic data storage system
TL;DR: Overall holographic data storage system is proposed in order to reduce IPI noise and increase storage in limited capacity and good performance as to recording and retrieving is obtained.
References
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Journal ArticleDOI
Angle-multiplexed storage of 5000 holograms in lithium niobate.
TL;DR: As many as 5000 holograms of high-resolution images have been stored within a single crystal of Fe:LiNbO3 using fracture-space multiplexing to increase the storage bandwidth.
Journal ArticleDOI
Optical data storage by using orthogonal wavelength-multiplexed volume holograms
TL;DR: A volume holographic data storage scheme that employs counterpropagating reference and image beams and wavelength multiplexing for page differentation and a reduction in holographic cross talk is predicted.
Journal ArticleDOI
Volume hologram multiplexing using a deterministic phase encoding method
TL;DR: A novel phase encoding method using deterministic orthogonal phase codes in a reference-based multiplexing technique is obtained that is able to retrieve multiple images with high diffraction efficiency without energy losses, adjustment problems or any time delay.
PatentDOI
Method for holographic storage using peristrophic multiplexing
TL;DR: A method of multiplexing holograms by rotating the material or, equivalently, the recording beams is described, and a total of 295 holograms in a 38-microm-thick photopolymer film is multiplexed by combining peristrophicmultiplexing with angle multiplexers.