Seminar title: How to choose the right RP system? Topic: Discover how modern rapid prototyping technology from ZCorporation can help you with fast process design, more effective work and cost reduction. This seminar presents technology possibilities and criteria inside small work environments for personal discussion. Duration: 3 hours + extra time for individual conversation |
Read more... |
Non-volatile holographic storage in doubly doped lithium niobate crystals |
Non-volatile holographic storage in doubly doped lithium niobate crystalsNature 393, 665-668 (18 June 1998) Subsequent homogeneous illumination results in light diffraction and reconstructs the information encoded in the original interference pattern. A range of inorganic and organic photorefractive materials are known2, in which thousands of holograms of high fidelity can be efficiently stored, reconstructed and erased. But there remains a problem with volatility: the read-out process usually erases the stored information and amplifies the scattered light. Several techniques for 'fixing' holograms have been developed3, 4, 5, 6, but they have practical disadvantages and only laboratory demonstrators have been built7, 8, 9, 10. Here we describe a resolution to the problem of volatility that should lead to the realization of a more practical system. We use crystals of lithium niobate — available both in large size and with excellent homogeneity — that have been doped with two different deep electron traps (iron and manganese). Illumination of the crystals with incoherent ultraviolet light during the recording process permits the storage of data (a red-light interference pattern) that can be subsequently read, in the absence of ultraviolet light, without erasure. Our crystals show up to 32 per cent diffraction efficiency, rapid optical erasure of the stored data is possible using ultraviolet light, and light scattering is effectively prevented. PERMALINK K. Buse1, A. Adibi1 and D. Psaltis1
|
Home |
About VisionPoint |
Visualization News |
Programmes |
Education |
eScience |
Contact |
CenVis Laboratory |
Distributed Visualization |
Available resources |