Hybrid multinary modulation using a phase modulating spatial light modulator and a low-pass spatial filter

Author(s):

Abstract:Zoltán Göröcs, Gábor Erdei, Tamás Sarkadi, Ferenc Ujhelyi, Judit Reményi, Pál Koppa, and Emoke Lorincz

“We propose a method for performing binary intensity and continuous phase modulation of beams with a spatial light modulator (SLM) and a low-pass spatial filtering 4-f system. With our method it is possible to avoid the use of phase masks in holographic data storage systems or to enhance the phase encoding of the SLM by making it capable of binary amplitude modulation. The data storage capabilities and the limitations of the method are studied.”

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Publication: Optics Letters, (subscription required)

Issue/Year/DOI: Optics Letters, Vol. 32, Issue 16, pp. 2336-2338 (2007)
doi:10.1364/OL.32.002336

Angle multiplexed storage with object beam alone

Author(s): Hon-Fai Yau, Jung-Ping Liu

Abstract:

“Making use of the interference of incident light waves and the accompanying fanning waves in a photorefractive LiNbO3 crystal, the authors have recorded binary images as well as gray-tone images in a crystal with only an object beam. Angle multiplexing has also been demonstrated with this one beam recording method. Basing on a model that the recording is accomplished through the interference of the object light and its fanning light, the authors have estimated the minimal angular separation for achieving a cross-talk-free multiplexing.”

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Publication: Applied Physics Letters, (subscription required)

Issue/Year/DOI: Appl. Phys. Lett. 90, 181916 (2007);
DOI:10.1063/1.2733629

Holographic recording in Fe:Ce:Ti doped LiNbO3 crystal

Author(s): Ravinder Kumar Banyal, B. Raghavendra Prasad

Abstract:

“High diffraction efficiency measurements in a triply doped Fe:Ce:Ti–LiNbO3 crystal are reported. The crystal shows an improved recording sensitivity, weak light-induced scattering and extremely slow readout erasure which makes it highly desirable for non-volatile data storage applications. The suitability of the crystal was demonstrated by high quality holographic recording and retrieval of several astronomical images using shift and rotational multiplexing scheme.”

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Publication: Optics Communications – via ScienceDirect.com (subscription required)

Issue/Year/DOI: Optics Communications, Volume 274, Issue 2, 15 June 2007, Pages 300-306
doi:10.1016/j.optcom.2007.02.029

Dynamisches System für die Aufnahme und optische Rekonstruktion von digitalen Hologrammen

Author(s): G. Wernicke, J. Frank, C. Günther, S. Krüger

Abstract:

“Es wird ein Aufbau zur Aufnahme und optischen Rekonstruktion von digitalen Hologrammen unter Verwendung von reflektiven Flüssigkristalldisplays vorgestellt. Anwendungen mit einer speziell modulierten Beleuchtung bei der Aufnahme zur Darstellung von holographischen Interferogrammen und die optische Rekonstruktion von Röntgenhologrammen wird gezeigt.”

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Publication: DGaO Proceedings, (free download)

ISSN: 1614-8436

Applications of the high-resolution optical reconstruction of digital holograms

Author(s): Günther Wernicke, Johannes Frank, Hartmut Gruber, Matthias Dürr, Andreas Langner, Stefan Eisebitt, Christian Günther, Larbi Bouamama, Sven Krüger and Andreas Hermerschmidt

Abstract:

“Adressable spatial light modulators with as much as possible ideal phase modulation are the precondition for their application in digital holography. An adapted driver electronics for the modulator and a correct knowledge of the modulation behavior can lead to a dynamic phase modulating device with nearly linear characteristic curve and a maximum phase range of 2pi. We show a system for recording and reconstruction of digital holograms applying a spatial light modulator for the optical reconstruction and the digital processing of the holograms. The data of a CCD-camera are taken to a PC and sent to a spatial light modulator. In that sense we realised an analog-digital converter for recording and a digital-analog converter for the optical hologram reconstruction. We discuss the resolution of the reconstruction and their applications, especially possibilities for the manipulation with the reconstructed wave field. ”

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Publication: SPIE Proceedings, (subscription required)

Issue/Year/DOI: Proc. SPIE, Vol. 6136, 61360Q (2006);
doi:10.1117/12.651622

Compensation for pixel-mismatch errors in shift-multiplexed holographic data storage

Author(s): Sungphil Kim, Seok Ho Song, Jideog Kim, and Hong-Seok Lee

Abstract:

“To read out correct data from shift-multiplexed holographic data storage, we propose a novel method of pixel matching by use of a tiny plane-parallel refraction plate placed in the path of converging readout beams. Tilting the refraction plate produces a shift in the lateral position of the readout beam incident upon the holographic storage disk, leading to compensation for pixel-mismatch errors by an improvement in bit-error rate of 3 orders of magnitude.”

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Publication: Optics Letters, (subscription required)

Issue/Year/DOI: Optics Letters, Vol. 30, Issue 7, pp. 771-773 (2005)
doi:10.1364/OL.30.000771