NDLI: High-density disk storage by multiplexed microholograms

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High-density disk storage by multiplexed microholograms

Content Provider	IEEE Xplore Digital Library
Author	Eichler, H.J. Kuemmel, P. Orlic, S. Wappelt, A.
Copyright Year	1995
Abstract	We propose a concept of holographic data storage which promises storage capacities of more than 100-Gbyte on a digital versatile disk (DVD)-sized disk. The information is stored bitwise in form of microscopic reflection holograms. High storage densities can be achieved by combining multiplexing methods and multilayer storage. A theoretical model for microscopic reflection holograms generated by focused Gaussian beams is proposed. Experimental results are presented for the recording and characterization of microholograms in DuPont's HRF-800 photopolymers. The local distribution of the diffraction efficiency was investigated by applying a confocal scanning microscope setup. Single-color holograms with a radius of 1.8 and 12 /spl mu/m depth have been recorded. We observe a blue shift in the spectral response of the microholograms of less than 2% due to shrinkage of the polymer. In the case of threefold wavelength multiplexing, all wavelengths are clearly resolved in the spectral response having spectral width /spl Delta//spl lambda/ of less than 10 nm (FWHM). Baking the holograms for 1 h at 120/spl deg/C nearly doubted the diffraction efficiency while the spectral response of the microholograms broadened by a factor two. We showed that 80-ps pulses are sufficient for holographic recording in the photopolymers. An optimized pre-illumination allows a significant increase in diffraction efficiency.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	840
Ending Page	848
Page Count	9
File Size	860061
File Format	PDF
ISSN	1077260X
Volume Number	4
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Holography Holographic optical components Ultrafast optics Optical reflection Optical scattering Microscopy Optical recording Optical films Memory Disk recording
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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