A presentation on the physics and working of Holographic memory and HVDs.

1. By
Sayandeb Banerjee
(13000311075)
Shiladitya Bandopadhyay
(13000311077)
Siddhartha Chattaraj
(13000311082)
Soumya Deep Das
(13000311089)
Mentor
Prof. Amiya Kumar Sarkar

2. • A Glance at History
• What is a Hologram?
• What is Holographic Memory?
• Working Principle
• HVD
• HVD Disc Structure
• Collinear Holography – Writing Data
• Collinear Holography – Reading Data
• HVD vs. Other Optical Discs

3. The Drive for More Memory!
1928
Magnetic
Tape
1956
Hard
Disk
1971
Floppy
Drive
1980
CD
1994
Flash
1995
DVD
2003
Bluray
HVD

4. LASER
OBJECT
BEAM SPLITTER
DIFFUSION
LENSES
“A three-dimensional image formed by the
interference of light beams from a laser or other
coherent light source.”

5. • A mass storage technology that uses three-
dimensional holographic images to enable
more information to be stored in a much
smaller space.
• A potential technology in the area of high-
capacity data storage currently dominated
by magnetic and conventional optical data
storage.”

6. 1010011001110001011010
1010101010101010100101
0101010010101010001100
1101011111101101111101
0101010010010101101010
SLM
COVER LAYER
RECORDING LAYER
REFLECTIVE LAYER
OBJECTIVE LENS

7. An optical disc technology developed between
April 2004 and mid-2008 that can store up to
several terabytes of data on an optical disc 10
cm or 12 cm in diameter.

8. Gap Layer
Pit
Base Layer
Aluminium reflective
Layer
Dichroic Mirror Layer
Recording Layer
(photo polymer)
Cover Layer
Hologram
Red Light
Green or Blue
Light

9. 10100110011100
01011010101010
10101010101001
01010101001010
Data
Data Pages
SLM
Laser
Recording
Medium
Reference
Beam
Signal
Beam
Relay Optics
Writing Data

10. Recording
Medium
Reference
Beam
Relay Optics
Image
Optics
Detector
10100110011100
01011010101010
10101010101001
01010101001010
Laser
Recovered Data
Reading Data

11. DVD DVD Blu-ray Blu-ray HVD
Number of Layers Single Dual Single Dual 200 +/-
Recording Capacity 4.7BG 9.4GB 25GB 50GB 3.9TB
Data Transfer Rate 11.08MB/s 11.08MB/s 36MB/s 36MB/s 1GB/s
IBM's test platforms can store up to 390 bits per square
micron. DVDs, by contrast, have a storage density of
about five bits per square micron.
Storage & Speed

12. Technology
Data is burnt 1 bit
at a time
Thin surface
recording
substrate~1mm
Serial data
1bit/pulse
Volumetric
recording
Page data is recorded in the
volumetric Recording layer
Page data through SLM
60,000 bits/pulse
200 – 300bits/ mm
Conventional Optical Disc Holographic Optical Disc

13. Life Expectancy
HVD’s have an estimated archival life expectancy of at
least 50 years or more compared to CD/DVD archival
life of 2 to 5 years (even though published life
expectancies are often cited as 10 to 25 years or longer
for optical media, it depends on the storage conditions
and quality of the disks).