27-01-2012, 04:46 PM
Holographic Memory
Holographic_Memory.pdf (Size: 873.17 KB / Downloads: 163)
Introduction & Summary
Part 4 of the CeBIT 2001 Report is a synopsis of the latest developments in 2”, 3½”, and 5¼” MO, 12” (phase change WORM), and 3-D holographic optical storage (crystal and photopolymer WORM).
Very few companies exhibited “high-performance” optical storage products of any kind. Fujitsu overwhelmingly dominates the 3½” MO drive market, Maxoptix and Sony are the only surviving 5¼” MO drive manufacturers, and Plasmon is the sole source for 12” WORM (ATG appears to have exited the business). Sony did not exhibit its 5¼” MO drive, but its major OEM customer, Hewlett Packard, did at its main stand in Hall 1. Neither Sony nor Maxoptix exhibited their advanced 5¼” MO UDO (Ultra Density Optical) or OSD (Optical Super Density) drive.
3-D Holographic Memories
Almost every year for the past 5 years, the promise of some type of 3-D holographic memory (holomem) system has hung ripe over CeBIT. The greater the demand for high-performance storage, the greater the level of interest in 3-D holomems. Unfortunately, 3-D holomems have generally turned out to be the hype du jour. Still, hope springs eternal, and those seeking something better than the old standby magnetic disk array or tape farm persist in reacting to every new prospect. Those with a need to do long-term archiving are especially interested
3-D Holographic Storage Background
The hologram was invented by 1971 physics Nobel laureate Dr. Dennis Gabor in 1948 at Imperial College (England) to solve an aberration problem in electron microscope images. The technology was made practical with the availability of the He-Ne gas laser and the invention of the off-axis (Fresnel) hologram by Emmett N. Leith and Uris Upatnieks at the University of Michigan in 1962. Finally, the concept of the 3-D holomem was proposed by P. J. van Heerden, a research scientist at Polaroid, in 1963
Basic 3-D Holomem Theory
A hologram is a true amplitude and phase representation of some object or data pattern. It is created with coherent laser light by interfering the light transmitted by or reflected from a data pattern (object or signal beam) with an unmodulated carrier (reference beam). The interference pattern created by the interaction of the two beams is captured by a storage medium, such as a photopolymer film or an electro-optical crystal (these are referred to as volume phase storage media, and are the focus of our interest here).
Holographic_Memory.pdf (Size: 873.17 KB / Downloads: 163)
Introduction & Summary
Part 4 of the CeBIT 2001 Report is a synopsis of the latest developments in 2”, 3½”, and 5¼” MO, 12” (phase change WORM), and 3-D holographic optical storage (crystal and photopolymer WORM).
Very few companies exhibited “high-performance” optical storage products of any kind. Fujitsu overwhelmingly dominates the 3½” MO drive market, Maxoptix and Sony are the only surviving 5¼” MO drive manufacturers, and Plasmon is the sole source for 12” WORM (ATG appears to have exited the business). Sony did not exhibit its 5¼” MO drive, but its major OEM customer, Hewlett Packard, did at its main stand in Hall 1. Neither Sony nor Maxoptix exhibited their advanced 5¼” MO UDO (Ultra Density Optical) or OSD (Optical Super Density) drive.
3-D Holographic Memories
Almost every year for the past 5 years, the promise of some type of 3-D holographic memory (holomem) system has hung ripe over CeBIT. The greater the demand for high-performance storage, the greater the level of interest in 3-D holomems. Unfortunately, 3-D holomems have generally turned out to be the hype du jour. Still, hope springs eternal, and those seeking something better than the old standby magnetic disk array or tape farm persist in reacting to every new prospect. Those with a need to do long-term archiving are especially interested
3-D Holographic Storage Background
The hologram was invented by 1971 physics Nobel laureate Dr. Dennis Gabor in 1948 at Imperial College (England) to solve an aberration problem in electron microscope images. The technology was made practical with the availability of the He-Ne gas laser and the invention of the off-axis (Fresnel) hologram by Emmett N. Leith and Uris Upatnieks at the University of Michigan in 1962. Finally, the concept of the 3-D holomem was proposed by P. J. van Heerden, a research scientist at Polaroid, in 1963
Basic 3-D Holomem Theory
A hologram is a true amplitude and phase representation of some object or data pattern. It is created with coherent laser light by interfering the light transmitted by or reflected from a data pattern (object or signal beam) with an unmodulated carrier (reference beam). The interference pattern created by the interaction of the two beams is captured by a storage medium, such as a photopolymer film or an electro-optical crystal (these are referred to as volume phase storage media, and are the focus of our interest here).