Non-volatile holographic storage in doubly doped lithium niobate crystals
Article Abstract:
The development of holographic storage for computer-generated information is being inhibited by the problems associated with the read-out phase because the stored data is destroyed by homogenous illumination. A new study investigates the use of two-colour holography. The lithium niobate crystal is doped with iron and manganese deep electron traps. The presence of UV light causes the data to be stored as red-light interference pattern, allowing it to be read, without erasure, in the absence of UV light.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Compound refractive optics for the imaging and focusing of low-energy neutrons
Article Abstract:
Low-energy neutrons are crucial in the analysis and characterization of materials and magnetic structures, but both reactor-based and spallation-based sources of neutrons have low fluence. This could be improved by steering and lensing devices. A prototype compound refractive lens (CRL) for 9-20-A neutrons has been designed, built and tested. Gains were greater than 15 with focal lengths of 1-6m, matching small-angle neutron scattering.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
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