Also Explore the Seminar Topics Paper on Holographic Versatile Disc Holographic Versatile Disc (HVD) is an optical disc technology still in. Download Seminar Report on Holographic Versatile uses a technique where green and red laser of length nm and nm. HVD is an optical disc technology developed between April and mid that can store up to several terabytes of data on an optical disc.
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SEMINAR REPORT ON Holographic Versatile Disc
It employs a technique known as collinear holography, whereby two lasers, one red and one blue-green, are collimated seminwr a single beam. Current optical storage saves one bit per pulse, and the HVD alliance hopes to improve this efficiency with capabilities of around 60, bits per pulse.
A hologram is a recording of the optical interference pattern that forms at the intersection of two coherent optical beams. Typically, light from a single laser is split into two paths, the signal path and hvx reference path.
The beam that propagates along the signal path esminar information, whereas the reference is designed to be simple to produce. A common reference beam is a plane wave: The two paths are overlapped on the holographic medium and the interference pattern between the two beams is recorded. A key property of this interferometric recording is that when it is illuminated by a readout beam, the signal beam is reproduced.
If the signal beam was created by reflecting light off a 3D object, then the reconstructed hologram makes the 3D object appear behind the holographic medium. When the hologram is recorded in a thin material, the readout beam can differ from the reference beam used for recording and the scene will still appear. When the blue-green argon laser is fired, a beam splitter creates two beams.
One beam, called the object or signal beamwill go straight, bounce off one mirror reportt travel through a spatial-light modulator SLM. The information from the page of binary code is carried by the signal beam around to the light-sensitive lithium-niobate crystal.
Some systems use a photopolymer in place of the crystal.
Seminar Report on Holographic Versatile Disc
A second beam, called the reference beamshoots out the side of the beam splitter and takes a separate path to the crystal. When the two beams meet, the interference pattern that is created stores the data carried seminxr the signal beam in a semiar area in the crystal — the data is stored as a hologram.
In order to retrieve and reconstruct the holographic page of data stored in the crystal, the reference beam is shined into the crystal at exactly the same angle at which it entered to store that page of data.
Each page of data is stored in a different area of the crystal, based on the angle at which the reference beam strikes it. During reconstructionthe beam will be diffracted by the crystal to allow the recreation of the original page that was stored.
This reconstructed page is then projected onto the charge-coupled device CCD camera, which interprets and forwards the digital information to a computer.
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