It was the freshman year of 2006-2007, My friend and I got very much excited about physics , especially Holography and how it can be a thing for the future, its been 10+ years since then and my knowledge about it, still remains limited to the very first & last abstract we wrote about it to pitch the idea of our project interest, sharing today:
This article provides an overview of holographic memory, a developing three-dimensional data storage system for computers. Holographic memory is a promising technology for data storage as data can be accessed an entire page at a time instead of sequentially. It uses a photosensitive material to record the interference pattern of object wave and reference wave. The nature of photosensitive material is such that the recorded object wave can be reproduced by applying a beam of coherent light to the material that is identical to the reference beam. The LibNO3 photorefractive crystal has been the most mature recording material for holographic memory due to its uniformity, high E-O coefficient, high photon sensitivity and commercial availability. An example of this technology is recording of a hologram. A hologram is a block or sheet of photosensitive material which can theoretically store data equal to one bit per cubic block of the size of the wavelength of light used in writing. Using light of this wavelength, perfect holographic storage could store 4 gigabits per cubic millimeter. Therefore by using this technology we can store the huge amount of data more compactly. Holographic data storage provides fast access time, as the LASER beams can be moved rapidly without inertia. When an appropriate photo refractive material is placed at the point of interference, the interference patterns are recorded inside the material. The laser beam is split into reference and signal beam. The data is encoded into the signal beam using a spatial light modulator (SLM) device that translates electronic data (0's and 1's) into an optical pattern of light and dark pixels. The practical example of this type of memory storage is Holographic Versatile Discs(HVD) which can be made rewritable by using reference beam for encoding and decoding by the help of interference and diffraction respectively.It can hold 3.9 terabytes of memory. Holographic memory writes and reads data in parallel in a single flash of lightThe future of holographic memory is very promising. The page access of data that holographic memory creates will provide a window into next generation computing by adding another dimension to stored data. Finding holograms in personal computers might be a bit longer off, however. The large cost of high-tech optical equipment would make small-scale systems implemented with holographic memory impractical. Holographic memory will most likely be used in next generation super computers where cost is not as much of an issue.
This article provides an overview of holographic memory, a developing three-dimensional data storage system for computers. Holographic memory is a promising technology for data storage as data can be accessed an entire page at a time instead of sequentially. It uses a photosensitive material to record the interference pattern of object wave and reference wave. The nature of photosensitive material is such that the recorded object wave can be reproduced by applying a beam of coherent light to the material that is identical to the reference beam. The LibNO3 photorefractive crystal has been the most mature recording material for holographic memory due to its uniformity, high E-O coefficient, high photon sensitivity and commercial availability. An example of this technology is recording of a hologram. A hologram is a block or sheet of photosensitive material which can theoretically store data equal to one bit per cubic block of the size of the wavelength of light used in writing. Using light of this wavelength, perfect holographic storage could store 4 gigabits per cubic millimeter. Therefore by using this technology we can store the huge amount of data more compactly. Holographic data storage provides fast access time, as the LASER beams can be moved rapidly without inertia. When an appropriate photo refractive material is placed at the point of interference, the interference patterns are recorded inside the material. The laser beam is split into reference and signal beam. The data is encoded into the signal beam using a spatial light modulator (SLM) device that translates electronic data (0's and 1's) into an optical pattern of light and dark pixels. The practical example of this type of memory storage is Holographic Versatile Discs(HVD) which can be made rewritable by using reference beam for encoding and decoding by the help of interference and diffraction respectively.It can hold 3.9 terabytes of memory. Holographic memory writes and reads data in parallel in a single flash of lightThe future of holographic memory is very promising. The page access of data that holographic memory creates will provide a window into next generation computing by adding another dimension to stored data. Finding holograms in personal computers might be a bit longer off, however. The large cost of high-tech optical equipment would make small-scale systems implemented with holographic memory impractical. Holographic memory will most likely be used in next generation super computers where cost is not as much of an issue.
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