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Home Research Inventions

Holographic versatile disks – the evolutionary improvement of blu-ray disks

Mihai Andrei by Mihai Andrei
April 14, 2011
in Inventions
Reading Time: 1 min read
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Vynil, cassettes, all that, they were a long time ago; nowadays, blu-ray disks rule ! But it seems we’ve been using them for quite a while, so one can only wonder what’s the next step in optical disk technology ? Well, the next step is called HVD, which stands for Holographic Versatile Disk, which employs a technology called collinear holography.

HVD

In collinear holography, a green and a red laser are collimated into a single beam; the green laser data encoded as laser interference fringes from a holographic layer near the top of the disc, while the red laser serves as a reference beam and reads the servo invo from the aluminum layer, pretty much like in normal CDs.

The laser beams pass selectively through the layers due to a layer of dichroic mirrors that exists between the holographic and servo data layer. The HVD will be able to hold about 20-200 times more information than a blu-ray disk, and a transfer rate of 128 MB/second.

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However, they are incompatible with current technology, and probably won’t appear for another 5-10 years; most plans are for implementing them in 2019 or 2010. However, it’s always good to know what the future holds for you… especially when it holds so much.

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Tags: holographic versatile diskshvdoptical disk technology
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Mihai Andrei

Mihai Andrei

Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.

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