Holography is a technique that uses lasers and interference patterns to fully record and reconstruct three-dimensional objects. It has various military applications including new holographic storage devices, heads-up displays in vehicles, generating holographic maps and decoys, and augmented reality training simulations. Holograms are created using two beams - an object beam that scatters off the object and a reference beam - that combine to record the interference pattern on a holographic plate. During reconstruction, the reference beam is passed through the plate, allowing the three-dimensional image to be seen.

1. HOLOGRAPHY AND ITS
APPLICATIONS IN
DEFENCE
SIDDHANT S SHIRGUPPE
CSE K3 64

2. What is holography?
 Holography is a technique that allows the light scattered from an object to be
recorded and later reconstructed.
 This technique is used to optically store,retrieve and process information.
 It preserves the 3D information of the object.

3. Timeline of holography

4. Types of holograms
HOLOGRAMS
 REFLECTION TRANSMISSION

5. How photographs work?
 Its makes use of white beam of light which is incoherent hence, undergoes results
in no interference pattern.
 In photography, only intensity is recorded so photography produces two
dimensional picture of the object(in case of colour photographs wavelength is
also recorded)

6. How holograms work?
 The working of the holograms is divided into two phase :
 1.recording
 2.reconstruction

7. Recording
 It consists of two beams: reference beam[A] and object beam[].
 The object beam is the scattered beam which is incoherent.
 The reference beam is coherent beam.
 However when they are both incident on the holographic plate, they create an
interference pattern which stores the optical data of the object.
 Thus the pattern on the plate can be considered as C
A + B = C

8. Diagram
A
B
C

9. Why laser?
 Normal white is incoherent thus it cannot be used to store phase difference.
 However laser is coherent , which is the main reason why interference pattern can
be generated .
 Laser being coherent, it can store phase difference as well which is the main
property required to produce holographic images.

10. Reconstruction
 In order to produce the hologram, the reference laser beam is passed through the
holographic plate in the opposite direction.
 This can be seen as a reverse process of recording.
 It can be represented as:
C – B = A

11. reference
A
C
-B

12. Millitary applications
 New optical laser discs which can handle holographic data, hence a substantial
increase in the storage capacity.
 Development of the holographic HUD(heads up display)
 Holographic maps resulting in a clearer understanding of the topography of the
hostile territory, hence producing more strategic combat plans
 Used to produce holographic buildings and utilities which act as decoy to the
hostile forces, which results in less collateral damage.
 Improved virtual reality and augmented reality for hand to hand combat training
of the soldiers
Other uses:
 Anti-counterfeiting in credit card is now a common practice.
 Intense real room gaming etc.

13. Millitary HUD using holograms
Holographic topographical maps

14. Millirtary combat using augmented reality
Intense virtual gaming experience

15. Conclusion
 In the future, holographic dispays will be replacing all present displays in all sizes
ranging from small phone screens to large projectors
 Holographic technology and spectral imaging has endless applications .
 It will give rise to a more technologically advanced and complex combat situations

16. References
 “Holographic projection technology :world is changing”
- Ahmed Elmorshidy(ph.d)
 “Touchable holography” – Takayuki Hoshi.
 “Holographic 3D displays within the grasp of commercialization”
– Stephen Reichelt.
 “How holograms work?” - William Tracy.
 “Working of hologarms”- physicsgirl (youtube channel).
 “Technical applications of hologarphs” – Integraf.

17. THANK YOU