How Does Holographic Memory Work

In summary, the conversation discusses a press release about a new technology for holographic data storage. The press release explains that a high frequency light source is used for writing and reading interference patterns, while a low frequency light source is used for tracking information. The substrate, photo polymer, gap layers, and dichroic mirror all play a role in the process. The aluminum reflection layer has pits to eliminate diffusion noise and improve signal quality. The conversation ends with a question inquiring about the process.
  • #1
dduardo
Staff Emeritus
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I found this press release just yesterday and I'm curious to know how it works:

http://www.optware.co.jp/english/what_040823.htm

In Figure 1:

-Substrate 2 is just a protective cover for the cd.
-The photo polymer is the recording layer, but which wavelength(color) is actually causing the polymerization for writing? And which one is reading the hologram?
-The gap layers are just there to separate the dichroic mirror.
-The dichoric mirror is basically a wavelength filter that either reflects light or allows light to pass through.
-Substrate 1 is just the shiny part of the cd that prevents the light from escaping. Why does the aluminum reflection layer have pits?
 
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  • #2
Bump

Can anyone answer my questions?
 
  • #3
The high frequency light source (blue) is used for writing (recording interference patterns) and reading these patterns. The low frequency light source (red) will be transmitted to the servo/tracking information etched on the aluminum reflector. Hence, "...preformatted address pits generate diffusion noise during read / write, thus deteriorate the signal quality", will be eliminated.

Regards

Don
 

1. How does holographic memory store information?

Holographic memory stores information by using lasers to encode data onto a photosensitive material, such as a crystal or polymer. This information is then retrieved by shining a laser on the material, which causes the stored hologram to diffract light and produce a 3D image of the data.

2. How is holographic memory different from traditional memory devices?

Holographic memory differs from traditional memory devices, such as hard drives or flash drives, in that it can store a significantly larger amount of data in a smaller physical space. It also allows for parallel retrieval of data, making it much faster than traditional memory devices.

3. How is data organized and accessed in holographic memory?

Data in holographic memory is organized and accessed using an address system, similar to traditional memory devices. However, in holographic memory, the address is based on the angle of the laser used to store the data, rather than the physical location on the material.

4. What are the advantages of using holographic memory?

Some advantages of using holographic memory include its high storage capacity, fast retrieval speed, and durability. It is also less susceptible to external factors, such as magnetic fields or temperature, which can affect traditional memory devices.

5. What are the potential applications of holographic memory?

Holographic memory has the potential to be used in a wide range of applications, such as data storage, medical imaging, and virtual reality. It could also be used in industries that require large amounts of data storage, such as finance or telecommunications.

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