Applications Of Holographic Memory Computer Science Essay

Applications Of Holographic Memory Computer Science Essay From the beginning generation of computer, speed of the processors has been increasing tremendously approximately twice the capacity for every 3 years. Today, we can access large amount of data with in few seconds using CPU and data storage. While the computer evolves many applications for large binary files like sound or image data for high capacity storage and data access. But, there is no high capacity form of data storage to handle these large files quickly and efficiently. So, Holographic memory is a hopeful technology in the next generation over conventional storage system because it is a three-dimensional data storage system that can store information at high density inside the crystal or photopolymer which has a capacity to Storage system, the data of entire page can be accessed at a time instead of sequential method and there are very few moving parts so the limitations of the mechanical motion can be minimized. To trace interference patterns it uses a photosensitive materi al of a reference beam and a signal beam of coherent light, while the signal beam is reflected off and an object or which contains information in the variety of light and dark areas. The natural history of the photosensitive material is to record the interference pattern which reproduce a beam of light to the material which matches to the reference beam. The resultant light that is transmitted through the medium will take on the recorded interference pattern and will be collected on a laser detector array that encompasses the entire surface of the holographic medium. Lots of holograms are recorded in the similar space by changing the wavelength of the incident light or angle. The whole page of data can be accessed in this way. Hence holographic storage system has the potential to became the next storage generation over conventional storage 2. Definition of Holographic Memory It is a storage device which records binary information into one of holograms, then produces (as interfering patterns) on photographic or photo chromic media by the way of laser beams, which can be read by low-power laser beams. It is a technique that can store information at high density inside the crystals or photopolymers. The main advantage of a hologram is that which has an image to be dispersed over the recording surface. So, there is no chance of dust or scratches that totally obscures information though they may deduce the contrast. There are many attempts done on many projects to apply this technology but none of them been commercially successful. 3. What is HVD? HVD known as Holographic Versatile Disc which is an optical technology still in the development stage which holds up to 4 terabyte of information. It has an technique called as collinear holography, which contains two lasers, first red laser and another is known as blue-green laser which collimated in a single beam. The second laser i.e. blue-green laser reads the data programmed as on laser interference outer reaches fro m a holographic layer near to the top of the disc where the reference beam uses the red laser and to study the information of servo from a usual CD-style aluminium layer close to the bottom.