It is a memory that can store information in form of holographic image.It is a technique that can store information at high density inside crystals or photopolymers.It provides data to be written beneath the surface of the disc.Holographic memory can store up to 1 Tb in a storage medium the size of a sugar cube crystal.
2. What is Holographic Memory ?
• It is a memory that can store information
in form of holographic image.
• It is a technique that can store
information at high density inside crystals
or photopolymers.
• It provides data to be written beneath the
surface of the disc.
• Holographic memory can store up to 1
Tb in a storage medium the size of a
sugar cube crystal.
3. To spilt the
laser beam
To direct the
laser beams
spatial light modulator
photopolymer
Interprets
the digital
informationBlue-green
argon laser
Beam
splitters
Mirrors
LCD panel
Lithium-
niobate
crystal
CCD
camera
Basic Components
9. Properties of Hologram
• A block or sheet of photosensitive material which
records the diffraction of two light sources.
• A laser beam is splitted into two beams:
Source beam
Reference beam
• The two beams diffracts to form the image on the
recording medium.
10. Spatial light modulator
• It is used for creating binary information out of
laser light.
• It is a 2D plane, consisting of pixels which can be
turned on and off to create binary 1.s and 0.s.
• It contains a two-dimensional array of windows,
which are only microns wide.
11. Page Data Access
• As the data is stored in the form of holograms,
data retrieval must be in the same form.
• So, a holographic system sends data in the form
of pages.
• It provides fast access times.
12. Error Correction
• As the density of data is massive, it is prone to
errors.
• Errors can be controlled by:
o Recording errors
o Page level parity bits
o Interfacing
13. Recording Errors
• Cause: Noise generated by laser beam
• Result: Can change a binary 0 to binary 1
• Possible Solution: Improvement in laser beam
and recording material
14. Page-level Parity Bits
• Data is stored in the form of 2-D array
• Odd no. of bits accounts for parity 1
• Even no. of bits accounts for parity 0
• Parity check bits are used
to identify any errors present
in the array
15. APPLICATIONS OF HOLOGRAPHY
• Product packaging
• Data mining
• Holograms are used in credit card, license,
books, magazine.
• Used in airplanes etc. in heads up display
• Used in testing for fractures and quality control.
• Application in future computer system.
• Used in 3-D projection of artistic images or
expressions.
16. CONCLUSION
There is bright scope of advancement in the field of
holography. The holographic storage provide high
data density . It can easily store 1000GB of data in a
small cubic centimeter crystal reducing the cost on
the other hand .It may offer high data transfer rate.
Till, the holographic storage is at the beginning
stage, it will mark its existence soon in the market.
We also understand that it costs more to acquire a new customer than to grow an existing one. CLICK. Many banks are successful in attracting new customers. CLICK. However, some of these new relationships tend to be shallow and can be unprofitable—as low as minus $1,200 in average contributions. CLICK. The annual contribution of customers averages $300. CLICK. High-Value customers can generate as much as $15,000 in contributions and tend to have multiple accounts. CLICK. Banks also have to worry about customer attrition, which is 15% per year on average. CLICK. In order to grow organically, banks need to focus on increasing the value of their existing customer relationships.
Figure 3 shows the reconstructed 2-D image from the hologram by shifting the position of recorded hologram in both X and Y axis. The reconstructed image is completely disappearing by 3 micron in both axes. This implies that we can record holograms by overlapping at a pitch of at least 3 micron. Figure 3: Shift selectivity Figure 4 shows SNR and the reconstructed image after 41 times overlapping recording at a pitch of 5 micron.