Courtesy Optware Holographic memory has been around for more than 40 years, but several characteristics made it difficult to implement in a consumer market. First off, most of these systems send the reference beam and the information beam into the recording medium on different axes. This requires highly complex optical systems to line them up at the exact point at which they need to intersect. Another drawback has to do with incompatibility with current storage media: Traditionally, holographic storage systems contained no servo data, because the beam carrying it could interfere with the holography process. Optware has implemented some changes in its HVD that could make it a better fit for the consumer market.
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Prototype HVD devices have been created with a capacity of 3. To increase capacity, holographic storage uses laser beams to store digital data in three dimensions, rather than in two dimensions as in CD and DVD media. HVD is, essentially, a holographic layer built on top of a conventional disc. The HVD process uses a blue-green laser beam, used for reading and writing data, collimated made parallel with a red laser beam, which is used for servo and tracking.
In the recording process, the initial laser is split into two beams. One of the beams passes through a device called a spatial light modulator SLM and combines with the direct beam to produce a hologram in the physical medium. To recover the data, another nm laser is directed into the hologram, which diffracts the laser beam.
The resulting image constitutes an optical reproduction of the original recorded data. A photosensitive semiconductor device converts this optical data into the original digital files. The first working HVD systems for the enterprise are expected to be shipped in , with consumer HVDs and drives to become available in or later.
The initial target market is high-volume mass storage, such as digital television DTV broadcasts and document libraries in large businesses and government agencies.
Holographic Versatile Disc
A new to the masses format for optical discs is on the cusp of market viability. When it comes to storing data, most of us have already forgotten on how innovative and life altering the introduction of compact discs and other optical media storage was for us. Even USB drives are becoming antiquated. Everything is digitally stored now on cloud software. However, many still strongly believe in the opportunity that disc media offers a modern world, which is where Holographic Versatile Discs HVD come in.
What are Holographic Versatile Discs (HVD)?
История[ править править код ] Впервые заговорили о возможности хранить информацию в голографических носителях в году. Первые продажи начались весной года в сети Amazon и в некоторых магазинах. Большой интерес данный формат вызвал в Голливуде. Один из крупнейших продюсеров и дистрибьюторов кинопродукции Майкл Джей Соломон из компании Warner Bros. Разработкой формата занимаются такие компании как Sony, Hewlett-Packard , Verbatim [en] и др. Новшество этого способа хранения информации заключается в том, что данные можно записывать не в двухмерном виде, а в трёхмерном. То есть при считывании возникает голограмма, площадь которой больше, чем площадь поверхности носителя, на которую она записана, в несколько раз .
How Holographic Versatile Discs Work